diff --git a/lombok.config b/lombok.config
new file mode 100644
index 0000000..062c1ea
--- /dev/null
+++ b/lombok.config
@@ -0,0 +1,2 @@
+# 让 Lombok 生成的方法带 @Generated 注解，JaCoCo 自动排除生成代码，覆盖率只统计手写逻辑
+lombok.addLombokGeneratedAnnotation = true
diff --git a/src/test/java/com/guo/learningprogresstracker/ApplicationMainTest.java b/src/test/java/com/guo/learningprogresstracker/ApplicationMainTest.java
new file mode 100644
index 0000000..4507d0f
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/ApplicationMainTest.java
@@ -0,0 +1,25 @@
+package com.guo.learningprogresstracker;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+/**
+ * 应用启动类 main 方法覆盖测试：
+ * 以非 Web 模式 + H2 内存库拉起 Spring 容器，正常返回即覆盖 main 方法体两行。
+ */
+class ApplicationMainTest {
+
+    @Test
+    void main_startsApplicationContextInNonWebMode() {
+        assertDoesNotThrow(() -> LearningProgressTrackerApplication.main(new String[]{
+                "--spring.main.web-application-type=none",
+                "--spring.datasource.driver-class-name=org.h2.Driver",
+                "--spring.datasource.url=jdbc:h2:mem:lpt_main_test;MODE=MySQL;DATABASE_TO_LOWER=TRUE;CASE_INSENSITIVE_IDENTIFIERS=TRUE;NON_KEYWORDS=USER",
+                "--spring.datasource.username=sa",
+                "--spring.datasource.password=",
+                "--spring.flyway.enabled=false",
+                "--mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.nologging.NoLoggingImpl"
+        }));
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/common/GlobalExceptionHandlerTest.java b/src/test/java/com/guo/learningprogresstracker/common/GlobalExceptionHandlerTest.java
new file mode 100644
index 0000000..08f6714
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/common/GlobalExceptionHandlerTest.java
@@ -0,0 +1,95 @@
+package com.guo.learningprogresstracker.common;
+
+import cn.dev33.satoken.exception.NotLoginException;
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.exception.AppException;
+import com.guo.learningprogresstracker.exception.ErrorParameterException;
+import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
+import com.guo.learningprogresstracker.exception.OperationFailedException;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.HttpStatus;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.mock.web.MockHttpServletResponse;
+import org.springframework.validation.BeanPropertyBindingResult;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+/**
+ * GlobalExceptionHandler 单元测试：直接实例化并调用各 handler 方法，
+ * 断言 CommonResult 的 code / message 语义。
+ */
+class GlobalExceptionHandlerTest {
+
+    private final GlobalExceptionHandler handler = new GlobalExceptionHandler();
+
+    @Test
+    void errorParameterException_returnsBadRequestWithMessage() {
+        CommonResult result = handler.errorParameterException(new ErrorParameterException("参数有误"));
+
+        assertEquals(HttpStatus.BAD_REQUEST.value(), result.getCode());
+        assertEquals("参数有误", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void notFindEntitiesException_returnsBadRequestWithMessage() {
+        CommonResult result = handler.notFindEntitiesException(new NotFindEntitiesException("数据不存在"));
+
+        assertEquals(HttpStatus.BAD_REQUEST.value(), result.getCode());
+        assertEquals("数据不存在", result.getMessage());
+    }
+
+    @Test
+    void operationFailedException_returnsBadRequestWithMessage() {
+        CommonResult result = handler.operationFailedException(new OperationFailedException("操作失败"));
+
+        assertEquals(HttpStatus.BAD_REQUEST.value(), result.getCode());
+        assertEquals("操作失败", result.getMessage());
+    }
+
+    @Test
+    void appException_returnsServerErrorWithMessage() {
+        CommonResult result = handler.AppException(new AppException("业务异常"));
+
+        assertEquals(HttpStatus.INTERNAL_SERVER_ERROR.value(), result.getCode());
+        assertEquals("业务异常", result.getMessage());
+    }
+
+    @Test
+    void methodArgumentNotValidException_returnsFirstFieldErrorMessage() {
+        MethodArgumentNotValidException ex =
+                new MethodArgumentNotValidException(null, new BeanPropertyBindingResult(new Object(), "o"));
+        ex.getBindingResult().addError(new FieldError("o", "f", "字段校验失败"));
+
+        CommonResult result = handler.MyMethodArgumentNotValidException(ex);
+
+        assertEquals(HttpStatus.BAD_REQUEST.value(), result.getCode());
+        assertEquals("字段校验失败", result.getMessage());
+    }
+
+    @Test
+    void handleNotLogin_setsHttp401AndReturnsUnauthorizedBody() {
+        NotLoginException ex = new NotLoginException(
+                NotLoginException.NOT_TOKEN_MESSAGE, "login", NotLoginException.NOT_TOKEN);
+        MockHttpServletRequest request = new MockHttpServletRequest();
+        MockHttpServletResponse response = new MockHttpServletResponse();
+
+        CommonResult result = handler.handleNotLogin(ex, request, response);
+
+        assertEquals(HttpStatus.UNAUTHORIZED.value(), response.getStatus());
+        assertEquals(HttpStatus.UNAUTHORIZED.value(), result.getCode());
+        assertEquals("未登录，请重新登录", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void fallbackException_returnsGenericBadRequest() {
+        CommonResult result = handler.Exception(new RuntimeException("意外错误"));
+
+        assertEquals(HttpStatus.BAD_REQUEST.value(), result.getCode());
+        assertEquals("操作没有成功，请稍后再试", result.getMessage());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/config/MybatisPlusConfigTest.java b/src/test/java/com/guo/learningprogresstracker/config/MybatisPlusConfigTest.java
new file mode 100644
index 0000000..b8b9cd5
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/config/MybatisPlusConfigTest.java
@@ -0,0 +1,106 @@
+package com.guo.learningprogresstracker.config;
+
+import cn.dev33.satoken.SaManager;
+import cn.dev33.satoken.context.SaTokenContext;
+import cn.dev33.satoken.context.SaTokenContextForThreadLocal;
+import cn.dev33.satoken.context.SaTokenContextForThreadLocalStorage;
+import cn.dev33.satoken.exception.NotLoginException;
+import cn.dev33.satoken.servlet.model.SaRequestForServlet;
+import cn.dev33.satoken.servlet.model.SaResponseForServlet;
+import cn.dev33.satoken.servlet.model.SaStorageForServlet;
+import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.inner.TenantLineInnerInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.handler.TenantLineHandler;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.mock.web.MockHttpServletResponse;
+
+import java.lang.reflect.Field;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * MybatisPlusConfig 单元测试：通过拦截器链反射取出 TenantLineHandler，
+ * 校验忽略表清单、租户列名，以及无登录态时 getTenantId 抛 NotLoginException。
+ */
+class MybatisPlusConfigTest {
+
+    private SaTokenContext previousContext;
+
+    @BeforeEach
+    void setUpSaTokenThreadLocalContext() {
+        previousContext = SaManager.getSaTokenContext();
+        SaManager.setSaTokenContext(new SaTokenContextForThreadLocal());
+        MockHttpServletRequest request = new MockHttpServletRequest();
+        SaTokenContextForThreadLocalStorage.setBox(
+                new SaRequestForServlet(request),
+                new SaResponseForServlet(new MockHttpServletResponse()),
+                new SaStorageForServlet(request));
+    }
+
+    @AfterEach
+    void restoreSaTokenContext() {
+        SaTokenContextForThreadLocalStorage.clearBox();
+        SaManager.setSaTokenContext(previousContext);
+    }
+
+    @Test
+    void mybatisPlusInterceptor_registersPaginationAndTenantInterceptors() throws Exception {
+        MybatisPlusInterceptor interceptor = new MybatisPlusConfig().mybatisPlusInterceptor();
+
+        List<InnerInterceptor> innerInterceptors = interceptor.getInterceptors();
+        assertEquals(2, innerInterceptors.size());
+        assertInstanceOf(PaginationInnerInterceptor.class, innerInterceptors.get(0));
+        TenantLineInnerInterceptor tenantInterceptor =
+                assertInstanceOf(TenantLineInnerInterceptor.class, innerInterceptors.get(1));
+
+        TenantLineHandler handler = tenantLineHandler(tenantInterceptor);
+        assertEquals("created_by", handler.getTenantIdColumn());
+    }
+
+    @Test
+    void ignoreTable_excludesSystemTablesWithoutCreatedBy() throws Exception {
+        TenantLineHandler handler = tenantLineHandler(tenantInterceptorOf(new MybatisPlusConfig()));
+
+        assertTrue(handler.ignoreTable("user"));
+        assertTrue(handler.ignoreTable("flyway_schema_history"));
+        assertTrue(handler.ignoreTable("databasechangelog"));
+        assertTrue(handler.ignoreTable("databasechangeloglock"));
+    }
+
+    @Test
+    void ignoreTable_businessTablesAreFiltered() throws Exception {
+        TenantLineHandler handler = tenantLineHandler(tenantInterceptorOf(new MybatisPlusConfig()));
+
+        assertFalse(handler.ignoreTable("task"));
+        assertFalse(handler.ignoreTable("study_sessions"));
+        assertFalse(handler.ignoreTable("TASK"));
+    }
+
+    @Test
+    void getTenantId_withoutLoginState_throwsNotLoginException() throws Exception {
+        TenantLineHandler handler = tenantLineHandler(tenantInterceptorOf(new MybatisPlusConfig()));
+
+        assertThrows(NotLoginException.class, handler::getTenantId);
+    }
+
+    private TenantLineInnerInterceptor tenantInterceptorOf(MybatisPlusConfig config) {
+        return (TenantLineInnerInterceptor) config.mybatisPlusInterceptor().getInterceptors().get(1);
+    }
+
+    /** TenantLineInnerInterceptor 未暴露 handler 访问器，通过反射读取私有字段。 */
+    private TenantLineHandler tenantLineHandler(TenantLineInnerInterceptor interceptor) throws Exception {
+        Field field = TenantLineInnerInterceptor.class.getDeclaredField("tenantLineHandler");
+        field.setAccessible(true);
+        return (TenantLineHandler) field.get(interceptor);
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/config/WebMvcConfigTest.java b/src/test/java/com/guo/learningprogresstracker/config/WebMvcConfigTest.java
new file mode 100644
index 0000000..ba19c54
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/config/WebMvcConfigTest.java
@@ -0,0 +1,173 @@
+package com.guo.learningprogresstracker.config;
+
+import cn.dev33.satoken.context.SaTokenContext;
+import cn.dev33.satoken.exception.NotLoginException;
+import cn.dev33.satoken.interceptor.SaInterceptor;
+import cn.dev33.satoken.spring.SaTokenContextForSpringInJakartaServlet;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.mock.web.MockHttpServletResponse;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.handler.MappedInterceptor;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * WebMvcConfig 单元测试：
+ * - addCorsMappings 用真实 CorsRegistry 验证三个配置分支的注册结果；
+ * - addInterceptors 取出注册的 SaInterceptor，借助 RequestContextHolder + sa-token Spring 上下文
+ *   驱动 preHandle，覆盖 OPTIONS 放行 lambda 与 GET 未登录抛 NotLoginException 分支。
+ */
+class WebMvcConfigTest {
+
+    private SaTokenContext previousContext;
+
+    @BeforeEach
+    void setUpSaTokenContext() {
+        previousContext = cn.dev33.satoken.SaManager.getSaTokenContext();
+        cn.dev33.satoken.SaManager.setSaTokenContext(new SaTokenContextForSpringInJakartaServlet());
+    }
+
+    @AfterEach
+    void restoreSaTokenContext() {
+        cn.dev33.satoken.SaManager.setSaTokenContext(previousContext);
+        RequestContextHolder.resetRequestAttributes();
+    }
+
+    // ============ addCorsMappings ============
+
+    @Test
+    void addCorsMappings_wildcardOrigin_registersOriginPatternsWithCredentials() {
+        CorsProperties props = new CorsProperties();
+        props.setAllowedOrigins(new String[]{"*"});
+        WebMvcConfig config = new WebMvcConfig(props);
+
+        InspectableCorsRegistry registry = new InspectableCorsRegistry();
+        config.addCorsMappings(registry);
+
+        Map<String, CorsConfiguration> configurations = registry.getCorsConfigurationsPublic();
+        assertEquals(1, configurations.size());
+        CorsConfiguration cors = configurations.get("/**");
+        assertEquals(List.of("*"), cors.getAllowedOriginPatterns());
+        assertTrue(cors.getAllowedMethods().contains("GET"));
+        assertTrue(cors.getAllowedMethods().contains("OPTIONS"));
+        assertTrue(cors.getAllowCredentials());
+    }
+
+    @Test
+    void addCorsMappings_explicitOrigins_nullCredentials_defaultsToTrue() {
+        CorsProperties props = new CorsProperties();
+        props.setAllowedOrigins(new String[]{"http://localhost:5158"});
+        props.setAllowCredentials(null);
+        WebMvcConfig config = new WebMvcConfig(props);
+
+        InspectableCorsRegistry registry = new InspectableCorsRegistry();
+        config.addCorsMappings(registry);
+
+        CorsConfiguration cors = registry.getCorsConfigurationsPublic().get("/**");
+        assertEquals(List.of("http://localhost:5158"), cors.getAllowedOrigins());
+        assertTrue(cors.getAllowCredentials());
+    }
+
+    @Test
+    void addCorsMappings_explicitOrigins_credentialsFalse_staysFalse() {
+        CorsProperties props = new CorsProperties();
+        props.setAllowedOrigins(new String[]{"http://localhost:5158"});
+        props.setAllowCredentials(Boolean.FALSE);
+        WebMvcConfig config = new WebMvcConfig(props);
+
+        InspectableCorsRegistry registry = new InspectableCorsRegistry();
+        config.addCorsMappings(registry);
+
+        CorsConfiguration cors = registry.getCorsConfigurationsPublic().get("/**");
+        assertFalse(cors.getAllowCredentials());
+    }
+
+    // ============ addInterceptors ============
+
+    @Test
+    void addInterceptors_registersSingleSaInterceptor() {
+        WebMvcConfig config = new WebMvcConfig(new CorsProperties());
+
+        InspectableInterceptorRegistry registry = new InspectableInterceptorRegistry();
+        config.addInterceptors(registry);
+
+        assertEquals(1, registry.getInterceptorsPublic().size());
+        HandlerInterceptor interceptor = (HandlerInterceptor) registry.getInterceptorsPublic().get(0);
+        // 注册时配置了 include/exclude 路径，框架会包装为 MappedInterceptor，最终都指向 SaInterceptor
+        assertTrue(interceptor instanceof MappedInterceptor || interceptor instanceof SaInterceptor);
+    }
+
+    @Test
+    void preHandle_optionsRequest_passesWithoutLoginCheck() throws Exception {
+        SaInterceptor interceptor = registeredSaInterceptor();
+        MockHttpServletRequest request = new MockHttpServletRequest("OPTIONS", "/tasks");
+        MockHttpServletResponse response = new MockHttpServletResponse();
+        RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));
+
+        assertTrue(interceptor.preHandle(request, response, new Object()));
+    }
+
+    @Test
+    void preHandle_getRequestWithoutToken_throwsNotLoginException() {
+        SaInterceptor interceptor = registeredSaInterceptor();
+        MockHttpServletRequest request = new MockHttpServletRequest("GET", "/tasks");
+        MockHttpServletResponse response = new MockHttpServletResponse();
+        RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));
+
+        assertThrows(NotLoginException.class,
+                () -> interceptor.preHandle(request, response, new Object()));
+    }
+
+    private SaInterceptor registeredSaInterceptor() {
+        WebMvcConfig config = new WebMvcConfig(new CorsProperties());
+        InspectableInterceptorRegistry registry = new InspectableInterceptorRegistry();
+        config.addInterceptors(registry);
+        return assertInstanceOf(SaInterceptor.class, unwrap(registry.getInterceptorsPublic().get(0)));
+    }
+
+    private Object unwrap(Object interceptor) {
+        if (interceptor instanceof MappedInterceptor mapped) {
+            return mapped.getInterceptor();
+        }
+        return interceptor;
+    }
+
+    /** InterceptorRegistry#getInterceptors 是 protected，这里仅在测试内拓宽可见性。 */
+    private static class InspectableInterceptorRegistry extends InterceptorRegistry {
+        @Override
+        public List<Object> getInterceptors() {
+            return super.getInterceptors();
+        }
+
+        List<Object> getInterceptorsPublic() {
+            return getInterceptors();
+        }
+    }
+
+    /** CorsRegistry#getCorsConfigurations 是 protected，这里仅在测试内拓宽可见性。 */
+    private static class InspectableCorsRegistry extends CorsRegistry {
+        @Override
+        public Map<String, CorsConfiguration> getCorsConfigurations() {
+            return super.getCorsConfigurations();
+        }
+
+        Map<String, CorsConfiguration> getCorsConfigurationsPublic() {
+            return getCorsConfigurations();
+        }
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/config/serializer/LocalDateTimeSerializerTest.java b/src/test/java/com/guo/learningprogresstracker/config/serializer/LocalDateTimeSerializerTest.java
new file mode 100644
index 0000000..f7d8ac8
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/config/serializer/LocalDateTimeSerializerTest.java
@@ -0,0 +1,56 @@
+package com.guo.learningprogresstracker.config.serializer;
+
+import com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import org.junit.jupiter.api.Test;
+
+import java.io.StringWriter;
+import java.time.LocalDateTime;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * LocalDateTimeSerializer 单元测试：注册到 ObjectMapper 序列化非 null 值；
+ * null 分支 Jackson 默认不回调自定义序列化器，故直接驱动 serialize(null, gen, null) 覆盖。
+ */
+class LocalDateTimeSerializerTest {
+
+    @Test
+    void serialize_nonNullValue_writesFormattedDateTime() throws Exception {
+        ObjectMapper mapper = new ObjectMapper();
+        SimpleModule module = new SimpleModule();
+        module.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer());
+        mapper.registerModule(module);
+
+        Bean bean = new Bean();
+        bean.setTime(LocalDateTime.of(2024, 5, 1, 8, 30, 5));
+
+        assertEquals("{\"time\":\"2024-05-01T08:30:05\"}", mapper.writeValueAsString(bean));
+    }
+
+    @Test
+    void serialize_nullValue_writesJsonNull() throws Exception {
+        StringWriter writer = new StringWriter();
+        JsonGenerator generator = new JsonFactory().createGenerator(writer);
+
+        new LocalDateTimeSerializer().serialize(null, generator, null);
+
+        generator.close();
+        assertEquals("null", writer.toString());
+    }
+
+    /** 简单载体，字段名为 time。 */
+    public static class Bean {
+        private LocalDateTime time;
+
+        public LocalDateTime getTime() {
+            return time;
+        }
+
+        public void setTime(LocalDateTime time) {
+            this.time = time;
+        }
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/controller/LoginControllerUnitTest.java b/src/test/java/com/guo/learningprogresstracker/controller/LoginControllerUnitTest.java
new file mode 100644
index 0000000..1abc423
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/controller/LoginControllerUnitTest.java
@@ -0,0 +1,56 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.guo.learningprogresstracker.dto.request.LoginBody;
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.service.LoginService;
+import com.guo.learningprogresstracker.service.UserService;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * LoginController 纯单元测试：mock LoginService / UserService。
+ */
+@ExtendWith(MockitoExtension.class)
+class LoginControllerUnitTest {
+
+    @Mock
+    private LoginService loginService;
+
+    @Mock
+    private UserService userServiceImpl;
+
+    @InjectMocks
+    private LoginController controller;
+
+    @Test
+    void login_authenticatesThenIssuesToken() throws Exception {
+        LoginBody body = new LoginBody();
+        body.setUsername("alice");
+        body.setPassword("secret");
+        when(userServiceImpl.authenticate("alice", "secret")).thenReturn("U-1");
+        when(loginService.login("U-1")).thenReturn("token-abc");
+
+        CommonResult<String> result = controller.login(body);
+
+        assertEquals(200, result.getCode());
+        assertEquals("登录成功！", result.getMessage());
+        assertEquals("token-abc", result.getData());
+        verify(loginService).login("U-1");
+    }
+
+    @Test
+    void logout_delegatesToLoginService() {
+        CommonResult<Void> result = controller.logout();
+
+        assertEquals(200, result.getCode());
+        assertEquals("已登出", result.getMessage());
+        verify(loginService).logout();
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/controller/ReportFragmentsControllerUnitTest.java b/src/test/java/com/guo/learningprogresstracker/controller/ReportFragmentsControllerUnitTest.java
new file mode 100644
index 0000000..8a6848a
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/controller/ReportFragmentsControllerUnitTest.java
@@ -0,0 +1,67 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.guo.learningprogresstracker.dto.request.CreateFragmentsRequest;
+import com.guo.learningprogresstracker.dto.request.UpdateFragmentsRequest;
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
+import com.guo.learningprogresstracker.service.impl.StudyReportFragmentsServiceImpl;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * reportFragmentsController 纯单元测试（类名小写开头，保持与生产代码一致）：
+ * 直接 new 控制器并 mock StudyReportFragmentsServiceImpl。
+ */
+@ExtendWith(MockitoExtension.class)
+class ReportFragmentsControllerUnitTest {
+
+    @Mock
+    private StudyReportFragmentsServiceImpl studyReportFragmentsServiceImpl;
+
+    @InjectMocks
+    private reportFragmentsController controller;
+
+    @Test
+    void createFragments_delegatesToService() throws Exception {
+        CreateFragmentsRequest request = new CreateFragmentsRequest();
+        request.setSessionNum("S-1");
+        request.setContent("今日学习内容");
+
+        CommonResult<Void> result = controller.createFragments(request);
+
+        assertEquals(200, result.getCode());
+        verify(studyReportFragmentsServiceImpl).createFragments(request);
+    }
+
+    @Test
+    void updateFragments_delegatesToService() throws Exception {
+        UpdateFragmentsRequest request = new UpdateFragmentsRequest();
+        request.setContent("更新后的内容");
+
+        CommonResult<Void> result = controller.updateFragments(9, request);
+
+        assertEquals(200, result.getCode());
+        verify(studyReportFragmentsServiceImpl).updateFragments(9, request);
+    }
+
+    @Test
+    void getFragmentsBySession_returnsFragmentList() {
+        List<StudyReportFragmentsEntity> fragments = List.of(new StudyReportFragmentsEntity());
+        when(studyReportFragmentsServiceImpl.getFragmentsBySession("S-2")).thenReturn(fragments);
+
+        CommonResult<List<StudyReportFragmentsEntity>> result = controller.getFragmentsBySession("S-2");
+
+        assertEquals(200, result.getCode());
+        assertSame(fragments, result.getData());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/controller/ReviewControllerUnitTest.java b/src/test/java/com/guo/learningprogresstracker/controller/ReviewControllerUnitTest.java
new file mode 100644
index 0000000..92d3cf0
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/controller/ReviewControllerUnitTest.java
@@ -0,0 +1,225 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.guo.learningprogresstracker.dto.ReviewFeedItem;
+import com.guo.learningprogresstracker.dto.ReviewTaskStats;
+import com.guo.learningprogresstracker.dto.request.RecallCompareRequest;
+import com.guo.learningprogresstracker.dto.request.UpdateStandardMindMapRequest;
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.entity.ReviewRecallRecordEntity;
+import com.guo.learningprogresstracker.entity.ReviewStandardMindMapEntity;
+import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
+import com.guo.learningprogresstracker.entity.StudyReportsEntity;
+import com.guo.learningprogresstracker.service.ReviewService;
+import com.guo.learningprogresstracker.service.StandardMindMapService;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * ReviewController 纯单元测试：直接 new 控制器并 mock 两个服务接口。
+ */
+@ExtendWith(MockitoExtension.class)
+class ReviewControllerUnitTest {
+
+    @Mock
+    private ReviewService reviewService;
+
+    @Mock
+    private StandardMindMapService standardMindMapService;
+
+    @InjectMocks
+    private ReviewController controller;
+
+    @Test
+    void getReviewFeed_passesLimitAndMode() {
+        List<ReviewFeedItem> feed = List.of(new ReviewFeedItem());
+        when(reviewService.getReviewFeed(30, "recent")).thenReturn(feed);
+
+        CommonResult<List<ReviewFeedItem>> result = controller.getReviewFeed(30, "recent");
+
+        assertEquals(200, result.getCode());
+        assertSame(feed, result.getData());
+    }
+
+    @Test
+    void getReviewTaskStats_noArg_returnsAllTaskStats() {
+        List<ReviewTaskStats> stats = List.of(new ReviewTaskStats());
+        when(reviewService.getReviewTaskStats()).thenReturn(stats);
+
+        CommonResult<List<ReviewTaskStats>> result = controller.getReviewTaskStats();
+
+        assertEquals(200, result.getCode());
+        assertSame(stats, result.getData());
+    }
+
+    @Test
+    void getReviewTaskStats_byTaskNum_returnsSingleStats() {
+        ReviewTaskStats stats = new ReviewTaskStats();
+        when(reviewService.getReviewTaskStats("T001")).thenReturn(stats);
+
+        CommonResult<ReviewTaskStats> result = controller.getReviewTaskStats("T001");
+
+        assertEquals(200, result.getCode());
+        assertSame(stats, result.getData());
+    }
+
+    @Test
+    void getTaskReview_returnsTaskFeed() {
+        List<ReviewFeedItem> feed = List.of(new ReviewFeedItem());
+        when(reviewService.getTaskReview("T002")).thenReturn(feed);
+
+        CommonResult<List<ReviewFeedItem>> result = controller.getTaskReview("T002");
+
+        assertEquals(200, result.getCode());
+        assertSame(feed, result.getData());
+    }
+
+    @Test
+    void getReportDetail_delegatesToService() throws Exception {
+        StudyReportsEntity report = new StudyReportsEntity();
+        when(reviewService.getReportDetail(11)).thenReturn(report);
+
+        CommonResult<StudyReportsEntity> result = controller.getReportDetail(11);
+
+        assertEquals(200, result.getCode());
+        assertSame(report, result.getData());
+    }
+
+    @Test
+    void getFragmentDetail_delegatesToService() throws Exception {
+        StudyReportFragmentsEntity fragment = new StudyReportFragmentsEntity();
+        when(reviewService.getFragmentDetail(22)).thenReturn(fragment);
+
+        CommonResult<StudyReportFragmentsEntity> result = controller.getFragmentDetail(22);
+
+        assertEquals(200, result.getCode());
+        assertSame(fragment, result.getData());
+    }
+
+    @Test
+    void getStandardMindMap_delegatesToService() throws Exception {
+        ReviewStandardMindMapEntity mindMap = new ReviewStandardMindMapEntity();
+        when(standardMindMapService.getOrGenerate("T003")).thenReturn(mindMap);
+
+        CommonResult<ReviewStandardMindMapEntity> result = controller.getStandardMindMap("T003");
+
+        assertEquals(200, result.getCode());
+        assertSame(mindMap, result.getData());
+    }
+
+    @Test
+    void regenerateStandardMindMap_incrementalMode_usesIncrementalGenerate() throws Exception {
+        ReviewStandardMindMapEntity mindMap = new ReviewStandardMindMapEntity();
+        when(standardMindMapService.incrementalGenerate("T004")).thenReturn(mindMap);
+
+        CommonResult<ReviewStandardMindMapEntity> result = controller.regenerateStandardMindMap("T004", "incremental");
+
+        assertEquals(200, result.getCode());
+        assertSame(mindMap, result.getData());
+        verify(standardMindMapService).incrementalGenerate("T004");
+    }
+
+    @Test
+    void regenerateStandardMindMap_defaultMode_usesFullRegenerate() throws Exception {
+        ReviewStandardMindMapEntity mindMap = new ReviewStandardMindMapEntity();
+        when(standardMindMapService.regenerate("T005")).thenReturn(mindMap);
+
+        CommonResult<ReviewStandardMindMapEntity> result = controller.regenerateStandardMindMap("T005", "full");
+
+        assertEquals(200, result.getCode());
+        assertSame(mindMap, result.getData());
+        verify(standardMindMapService).regenerate("T005");
+    }
+
+    @Test
+    void updateStandardMindMap_passesOutline() throws Exception {
+        UpdateStandardMindMapRequest request = new UpdateStandardMindMapRequest();
+        request.setOutline("- 根节点\n- 子节点");
+        ReviewStandardMindMapEntity mindMap = new ReviewStandardMindMapEntity();
+        when(standardMindMapService.updateByOutline("T006", "- 根节点\n- 子节点")).thenReturn(mindMap);
+
+        CommonResult<ReviewStandardMindMapEntity> result = controller.updateStandardMindMap("T006", request);
+
+        assertEquals(200, result.getCode());
+        assertSame(mindMap, result.getData());
+    }
+
+    @Test
+    void recallCompare_passesOutlineAndFocusPath() throws Exception {
+        RecallCompareRequest request = new RecallCompareRequest();
+        request.setRecallOutline("- 回忆内容");
+        request.setFocusPath("根/子");
+        ReviewStandardMindMapEntity mindMap = new ReviewStandardMindMapEntity();
+        when(standardMindMapService.recallCompare("T007", "- 回忆内容", "根/子")).thenReturn(mindMap);
+
+        CommonResult<ReviewStandardMindMapEntity> result = controller.recallCompare("T007", request);
+
+        assertEquals(200, result.getCode());
+        assertSame(mindMap, result.getData());
+    }
+
+    @Test
+    void findNode_nullBody_usesEmptyContent() throws Exception {
+        Map<String, Object> matched = Map.of("id", "n1");
+        when(standardMindMapService.findNode("T008", "")).thenReturn(matched);
+
+        CommonResult<Map<String, Object>> result = controller.findNode("T008", null);
+
+        assertEquals(200, result.getCode());
+        assertSame(matched, result.getData());
+    }
+
+    @Test
+    void findNode_bodyWithoutContentKey_usesEmptyContent() throws Exception {
+        Map<String, Object> matched = Map.of("id", "n2");
+        when(standardMindMapService.findNode("T009", "")).thenReturn(matched);
+
+        CommonResult<Map<String, Object>> result = controller.findNode("T009", Map.of("other", "x"));
+
+        assertEquals(200, result.getCode());
+        assertSame(matched, result.getData());
+    }
+
+    @Test
+    void findNode_bodyWithContent_usesContent() throws Exception {
+        Map<String, Object> matched = Map.of("id", "n3");
+        when(standardMindMapService.findNode("T010", "租户隔离")).thenReturn(matched);
+
+        CommonResult<Map<String, Object>> result = controller.findNode("T010", Map.of("content", "租户隔离"));
+
+        assertEquals(200, result.getCode());
+        assertSame(matched, result.getData());
+    }
+
+    @Test
+    void listRecallRecords_returnsRecords() throws Exception {
+        List<ReviewRecallRecordEntity> records = List.of(new ReviewRecallRecordEntity());
+        when(standardMindMapService.listRecallRecords("T011")).thenReturn(records);
+
+        CommonResult<List<ReviewRecallRecordEntity>> result = controller.listRecallRecords("T011");
+
+        assertEquals(200, result.getCode());
+        assertSame(records, result.getData());
+    }
+
+    @Test
+    void getRecallRecord_returnsSingleRecord() throws Exception {
+        ReviewRecallRecordEntity record = new ReviewRecallRecordEntity();
+        when(standardMindMapService.getRecallRecord(33)).thenReturn(record);
+
+        CommonResult<ReviewRecallRecordEntity> result = controller.getRecallRecord(33);
+
+        assertEquals(200, result.getCode());
+        assertSame(record, result.getData());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/controller/StudySessionControllerUnitTest.java b/src/test/java/com/guo/learningprogresstracker/controller/StudySessionControllerUnitTest.java
new file mode 100644
index 0000000..42789a8
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/controller/StudySessionControllerUnitTest.java
@@ -0,0 +1,191 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.guo.learningprogresstracker.dto.request.AbortStudySessionRequest;
+import com.guo.learningprogresstracker.dto.request.EndedStudySessionRequest;
+import com.guo.learningprogresstracker.dto.request.UpsertExpectationRequest;
+import com.guo.learningprogresstracker.dto.response.StudySessionResponse;
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.entity.StudyExpectationsEntity;
+import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
+import com.guo.learningprogresstracker.entity.StudyReportsEntity;
+import com.guo.learningprogresstracker.service.StudyExpectationsService;
+import com.guo.learningprogresstracker.service.impl.StudySessionsServiceImpl;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * StudySessionController 纯单元测试：直接 new 控制器并 mock 服务层，
+ * 不启动 Spring 容器（与既有 @SpringBootTest 风格的 StudySessionControllerTest 互补）。
+ */
+@ExtendWith(MockitoExtension.class)
+class StudySessionControllerUnitTest {
+
+    @Mock
+    private StudySessionsServiceImpl studySessionsServiceImpl;
+
+    @Mock
+    private StudyExpectationsService studyExpectationsService;
+
+    @InjectMocks
+    private StudySessionController controller;
+
+    @Test
+    void upsertExpectation_delegatesToService() throws Exception {
+        UpsertExpectationRequest request = new UpsertExpectationRequest();
+        request.setDescription("目标：掌握租户隔离");
+        StudyExpectationsEntity entity = new StudyExpectationsEntity();
+        when(studyExpectationsService.upsertExpectation("S001", "目标：掌握租户隔离")).thenReturn(entity);
+
+        CommonResult<StudyExpectationsEntity> result = controller.upsertExpectation("S001", request);
+
+        assertEquals(200, result.getCode());
+        assertSame(entity, result.getData());
+        verify(studyExpectationsService).upsertExpectation("S001", "目标：掌握租户隔离");
+    }
+
+    @Test
+    void getExpectation_delegatesToService() {
+        StudyExpectationsEntity entity = new StudyExpectationsEntity();
+        when(studyExpectationsService.getBySessionNum("S002")).thenReturn(entity);
+
+        CommonResult<StudyExpectationsEntity> result = controller.getExpectation("S002");
+
+        assertEquals(200, result.getCode());
+        assertSame(entity, result.getData());
+    }
+
+    @Test
+    void getStudySessionBySessionNum_delegatesToService() throws Exception {
+        StudySessionResponse response = new StudySessionResponse();
+        when(studySessionsServiceImpl.getStudySessionBySessionNum("S003")).thenReturn(response);
+
+        CommonResult<StudySessionResponse> result = controller.getStudySessionBySessionNum("S003");
+
+        assertEquals(200, result.getCode());
+        assertSame(response, result.getData());
+    }
+
+    @Test
+    void startStudySession_continuesSessionAndReturnsSuccess() throws Exception {
+        CommonResult<Void> result = controller.startStudySession("S004");
+
+        assertEquals(200, result.getCode());
+        assertNull(result.getData());
+        verify(studySessionsServiceImpl).continueStudySession("S004");
+    }
+
+    @Test
+    void pauseStudySession_passesEndTimeThrough() throws Exception {
+        LocalDateTime endTime = LocalDateTime.of(2024, 5, 1, 12, 0);
+
+        CommonResult<Void> result = controller.pauseStudySession("S005", endTime);
+
+        assertEquals(200, result.getCode());
+        verify(studySessionsServiceImpl).pauseStudySession("S005", endTime);
+    }
+
+    @Test
+    void endedStudySession_withReportMessage_returnsMessageInData() throws Exception {
+        EndedStudySessionRequest request = new EndedStudySessionRequest();
+        request.setContent("报告内容");
+        when(studySessionsServiceImpl.endedStudySession("S006", "报告内容")).thenReturn("报告摘要");
+
+        CommonResult<Void> result = controller.endedStudySession("S006", request);
+
+        assertEquals(200, result.getCode());
+        // 注意：CommonResult.success(String) 重载优先匹配 message 参数，
+        // 报告摘要落在 message 字段而非 data（生产行为如此，按实际语义断言）
+        assertEquals("报告摘要", result.getMessage());
+    }
+
+    @Test
+    void endedStudySession_withoutReportMessage_returnsEmptySuccess() throws Exception {
+        EndedStudySessionRequest request = new EndedStudySessionRequest();
+        request.setContent("无报告内容");
+        when(studySessionsServiceImpl.endedStudySession("S007", "无报告内容")).thenReturn(null);
+
+        CommonResult<Void> result = controller.endedStudySession("S007", request);
+
+        assertEquals(200, result.getCode());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void abortStudySession_delegatesConfirmation() throws Exception {
+        AbortStudySessionRequest request = new AbortStudySessionRequest();
+        request.setConfirmation("确认删除");
+
+        CommonResult<Void> result = controller.abortStudySession("S008", request);
+
+        assertEquals(200, result.getCode());
+        verify(studySessionsServiceImpl).abortStudySession("S008", "确认删除");
+    }
+
+    @Test
+    void getAllFragments_returnsFragmentList() throws Exception {
+        ArrayList<String> fragments = new ArrayList<>(List.of("片段一", "片段二"));
+        when(studySessionsServiceImpl.getAllFragments("S009")).thenReturn(fragments);
+
+        CommonResult<ArrayList<String>> result = controller.getAllFragments("S009");
+
+        assertEquals(200, result.getCode());
+        assertSame(fragments, result.getData());
+    }
+
+    @Test
+    void getReportDraft_returnsGeneratedDraft() throws Exception {
+        when(studySessionsServiceImpl.generateReportDraft("S010")).thenReturn("草稿内容");
+
+        CommonResult<String> result = controller.getReportDraft("S010");
+
+        assertEquals(200, result.getCode());
+        assertEquals("草稿内容", result.getData());
+    }
+
+    @Test
+    void getTaskFragments_passesPagingArguments() {
+        Page<StudyReportFragmentsEntity> page = new Page<>();
+        when(studySessionsServiceImpl.getTaskFragments("T001", 2, 5, "关键词")).thenReturn(page);
+
+        CommonResult<Page<StudyReportFragmentsEntity>> result = controller.getTaskFragments("T001", 2, 5, "关键词");
+
+        assertEquals(200, result.getCode());
+        assertSame(page, result.getData());
+    }
+
+    @Test
+    void getTaskReports_passesPagingArguments() {
+        Page<StudyReportsEntity> page = new Page<>();
+        when(studySessionsServiceImpl.getTaskReports("T002", 3, 20, null)).thenReturn(page);
+
+        CommonResult<Page<StudyReportsEntity>> result = controller.getTaskReports("T002", 3, 20, null);
+
+        assertEquals(200, result.getCode());
+        assertSame(page, result.getData());
+    }
+
+    @Test
+    void getActiveSession_passesExcludeTaskNum() {
+        StudySessionResponse response = new StudySessionResponse();
+        when(studySessionsServiceImpl.getActiveSession("T003")).thenReturn(response);
+
+        CommonResult<StudySessionResponse> result = controller.getActiveSession("T003");
+
+        assertEquals(200, result.getCode());
+        assertSame(response, result.getData());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/controller/TaskControllerUnitTest.java b/src/test/java/com/guo/learningprogresstracker/controller/TaskControllerUnitTest.java
new file mode 100644
index 0000000..675e20e
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/controller/TaskControllerUnitTest.java
@@ -0,0 +1,188 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.guo.learningprogresstracker.dto.TaskInfo;
+import com.guo.learningprogresstracker.dto.request.CreateTaskApplicationRequest;
+import com.guo.learningprogresstracker.dto.request.TaskRequest;
+import com.guo.learningprogresstracker.dto.request.UpdateTaskApplicationRequest;
+import com.guo.learningprogresstracker.dto.response.StudySessionResponse;
+import com.guo.learningprogresstracker.dto.response.TaskInfoResponse;
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.entity.TaskApplicationEntity;
+import com.guo.learningprogresstracker.entity.UserPriorityWeightsEntity;
+import com.guo.learningprogresstracker.service.PriorityWeightsService;
+import com.guo.learningprogresstracker.service.TasksService;
+import com.guo.learningprogresstracker.service.impl.StudySessionsServiceImpl;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * TaskController 纯单元测试：直接 new 控制器并 mock 三个依赖服务。
+ */
+@ExtendWith(MockitoExtension.class)
+class TaskControllerUnitTest {
+
+    @Mock
+    private TasksService tasksService;
+
+    @Mock
+    private StudySessionsServiceImpl studySessionsServiceImpl;
+
+    @Mock
+    private PriorityWeightsService priorityWeightsService;
+
+    @InjectMocks
+    private TaskController controller;
+
+    @Test
+    void getPriorityWeights_delegatesToService() {
+        UserPriorityWeightsEntity weights = new UserPriorityWeightsEntity();
+        when(priorityWeightsService.getWeights()).thenReturn(weights);
+
+        CommonResult<UserPriorityWeightsEntity> result = controller.getPriorityWeights();
+
+        assertEquals(200, result.getCode());
+        assertSame(weights, result.getData());
+    }
+
+    @Test
+    void savePriorityWeights_delegatesToService() throws Exception {
+        UserPriorityWeightsEntity weights = new UserPriorityWeightsEntity();
+        UserPriorityWeightsEntity saved = new UserPriorityWeightsEntity();
+        when(priorityWeightsService.saveWeights(weights)).thenReturn(saved);
+
+        CommonResult<UserPriorityWeightsEntity> result = controller.savePriorityWeights(weights);
+
+        assertEquals(200, result.getCode());
+        assertSame(saved, result.getData());
+    }
+
+    @Test
+    void addTask_returnsGeneratedTaskNum() throws Exception {
+        TaskRequest request = new TaskRequest();
+        when(tasksService.addTask(request)).thenReturn("T-100");
+
+        CommonResult<String> result = controller.addTask(request);
+
+        assertEquals(200, result.getCode());
+        assertEquals("T-100", result.getData());
+    }
+
+    @Test
+    void getTask_delegatesToService() {
+        TaskInfoResponse response = new TaskInfoResponse();
+        when(tasksService.getTask("1")).thenReturn(response);
+
+        CommonResult<TaskInfoResponse> result = controller.getTask("1");
+
+        assertEquals(200, result.getCode());
+        assertSame(response, result.getData());
+    }
+
+    @Test
+    void updateTask_delegatesToService() {
+        TaskRequest request = new TaskRequest();
+
+        CommonResult<Void> result = controller.updateTask("2", request);
+
+        assertEquals(200, result.getCode());
+        verify(tasksService).updateTask("2", request);
+    }
+
+    @Test
+    void deleteTask_delegatesToService() throws Exception {
+        CommonResult<Void> result = controller.deleteTask("3");
+
+        assertEquals(200, result.getCode());
+        verify(tasksService).deleteTask("3");
+    }
+
+    @Test
+    void getApplications_returnsApplicationList() throws Exception {
+        List<TaskApplicationEntity> applications = List.of(new TaskApplicationEntity());
+        when(tasksService.getApplications("T-1")).thenReturn(applications);
+
+        CommonResult<List<TaskApplicationEntity>> result = controller.getApplications("T-1");
+
+        assertEquals(200, result.getCode());
+        assertSame(applications, result.getData());
+    }
+
+    @Test
+    void createApplication_fillsTaskNumBeforeDelegation() throws Exception {
+        CreateTaskApplicationRequest request = new CreateTaskApplicationRequest();
+        request.setTitle("背单词");
+        TaskApplicationEntity created = new TaskApplicationEntity();
+        when(tasksService.createApplication(request)).thenReturn(created);
+
+        CommonResult<TaskApplicationEntity> result = controller.createApplication("T-2", request);
+
+        assertEquals("T-2", request.getTaskNum());
+        assertEquals(200, result.getCode());
+        assertSame(created, result.getData());
+    }
+
+    @Test
+    void updateApplication_delegatesToService() throws Exception {
+        UpdateTaskApplicationRequest request = new UpdateTaskApplicationRequest();
+        request.setTitle("更新后的标题");
+        TaskApplicationEntity updated = new TaskApplicationEntity();
+        when(tasksService.updateApplication(7, request)).thenReturn(updated);
+
+        CommonResult<TaskApplicationEntity> result = controller.updateApplication(7, request);
+
+        assertEquals(200, result.getCode());
+        assertSame(updated, result.getData());
+    }
+
+    @Test
+    void deleteApplication_delegatesToService() throws Exception {
+        CommonResult<Void> result = controller.deleteApplication(8);
+
+        assertEquals(200, result.getCode());
+        verify(tasksService).deleteApplication(8);
+    }
+
+    @Test
+    void tasksList_passesPagingArguments() {
+        Page<TaskInfo> page = new Page<>();
+        when(tasksService.taskList(2, 20)).thenReturn(page);
+
+        CommonResult<Page<TaskInfo>> result = controller.tasksList(2, 20);
+
+        assertEquals(200, result.getCode());
+        assertSame(page, result.getData());
+    }
+
+    @Test
+    void startOrContinueStudySession_delegatesToImpl() throws Exception {
+        StudySessionResponse response = new StudySessionResponse();
+        when(studySessionsServiceImpl.startOrContinueStudySession("T-3")).thenReturn(response);
+
+        CommonResult<StudySessionResponse> result = controller.startOrContinueStudySession("T-3");
+
+        assertEquals(200, result.getCode());
+        assertSame(response, result.getData());
+    }
+
+    @Test
+    void getNotEndedStudySessionByTaskNum_delegatesToImpl() throws Exception {
+        StudySessionResponse response = new StudySessionResponse();
+        when(studySessionsServiceImpl.getNotEndedStudySessionByTaskNum("T-4")).thenReturn(response);
+
+        CommonResult<StudySessionResponse> result = controller.getNotEndedStudySessionByTaskNum("T-4");
+
+        assertEquals(200, result.getCode());
+        assertSame(response, result.getData());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/controller/TestControllerUnitTest.java b/src/test/java/com/guo/learningprogresstracker/controller/TestControllerUnitTest.java
new file mode 100644
index 0000000..f06d744
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/controller/TestControllerUnitTest.java
@@ -0,0 +1,90 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.entity.TestTableEntity;
+import com.guo.learningprogresstracker.exception.AppException;
+import com.guo.learningprogresstracker.exception.ErrorParameterException;
+import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
+import com.guo.learningprogresstracker.exception.OperationFailedException;
+import com.guo.learningprogresstracker.service.TestTableService;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.verifyNoInteractions;
+import static org.mockito.Mockito.when;
+
+/**
+ * TestController 纯单元测试：同包直接注入 mock 的 TestTableService 字段，
+ * 覆盖按 id 触发的各业务异常分支。
+ */
+@ExtendWith(MockitoExtension.class)
+class TestControllerUnitTest {
+
+    @Mock
+    private TestTableService testTableService;
+
+    @Test
+    void getTestEntityById_id1_throwsAppException() {
+        TestController controller = new TestController();
+        controller.testTableService = testTableService;
+
+        AppException ex = assertThrows(AppException.class, () -> controller.getTestEntityById("1"));
+
+        assertEquals("测试AppException", ex.getMessage());
+        verifyNoInteractions(testTableService);
+    }
+
+    @Test
+    void getTestEntityById_id2_throwsErrorParameterException() {
+        TestController controller = new TestController();
+        controller.testTableService = testTableService;
+
+        ErrorParameterException ex = assertThrows(ErrorParameterException.class,
+                () -> controller.getTestEntityById("2"));
+
+        assertEquals("测试ErrorParameterException", ex.getMessage());
+        verifyNoInteractions(testTableService);
+    }
+
+    @Test
+    void getTestEntityById_id3_throwsNotFindEntitiesException() {
+        TestController controller = new TestController();
+        controller.testTableService = testTableService;
+
+        NotFindEntitiesException ex = assertThrows(NotFindEntitiesException.class,
+                () -> controller.getTestEntityById("3"));
+
+        assertEquals("测试NotFindEntitiesException", ex.getMessage());
+        verifyNoInteractions(testTableService);
+    }
+
+    @Test
+    void getTestEntityById_id4_throwsOperationFailedException() {
+        TestController controller = new TestController();
+        controller.testTableService = testTableService;
+
+        OperationFailedException ex = assertThrows(OperationFailedException.class,
+                () -> controller.getTestEntityById("4"));
+
+        assertEquals("测试OperationFailedException", ex.getMessage());
+        verifyNoInteractions(testTableService);
+    }
+
+    @Test
+    void getTestEntityById_otherId_returnsEntityFromService() throws Exception {
+        TestController controller = new TestController();
+        controller.testTableService = testTableService;
+        TestTableEntity entity = new TestTableEntity();
+        when(testTableService.getTestEntityById("5")).thenReturn(entity);
+
+        CommonResult<TestTableEntity> result = controller.getTestEntityById("5");
+
+        assertEquals(200, result.getCode());
+        assertSame(entity, result.getData());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/controller/UtilsControllerUnitTest.java b/src/test/java/com/guo/learningprogresstracker/controller/UtilsControllerUnitTest.java
new file mode 100644
index 0000000..1b47f8d
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/controller/UtilsControllerUnitTest.java
@@ -0,0 +1,59 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.support.TestHttpServer;
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+/**
+ * UtilsController 单元测试：fetchTitle 内部调用 TitleFetcher 静态方法无法 mock，
+ * 用本地 TestHttpServer 提供真实页面验证网络分支，null/空白参数直接断言错误结果。
+ */
+class UtilsControllerUnitTest extends TestHttpServer {
+
+    private final UtilsController controller = new UtilsController();
+
+    @Test
+    void fetchTitle_nullUrl_returnsError() {
+        CommonResult<Map<String, String>> result = controller.fetchTitle(null);
+
+        assertEquals(400, result.getCode());
+        assertEquals("url 参数不能为空", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void fetchTitle_blankUrl_returnsError() {
+        CommonResult<Map<String, String>> result = controller.fetchTitle("   ");
+
+        assertEquals(400, result.getCode());
+        assertEquals("url 参数不能为空", result.getMessage());
+    }
+
+    @Test
+    void fetchTitle_validUrl_returnsPageTitle() {
+        route("GET", "/page", 200, "<html><head><title>单元测试标题</title></head></html>");
+
+        CommonResult<Map<String, String>> result = controller.fetchTitle(baseUrl() + "/page?q=1");
+
+        assertEquals(200, result.getCode());
+        assertEquals("单元测试标题", result.getData().get("title"));
+        assertEquals("q=1", lastQuery("GET", "/page"));
+    }
+
+    @Test
+    void fetchTitle_pageWithoutTitle_fallsBackToUrl() {
+        route("GET", "/plain", 200, "纯文本没有标题",
+                Map.of("Content-Type", "text/plain; charset=utf-8"));
+
+        String url = baseUrl() + "/plain";
+        CommonResult<Map<String, String>> result = controller.fetchTitle(url);
+
+        assertEquals(200, result.getCode());
+        assertEquals(url, result.getData().get("title"));
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/entity/CommonResultTest.java b/src/test/java/com/guo/learningprogresstracker/entity/CommonResultTest.java
new file mode 100644
index 0000000..1c19338
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/entity/CommonResultTest.java
@@ -0,0 +1,106 @@
+package com.guo.learningprogresstracker.entity;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * CommonResult 单元测试：覆盖全部工厂方法与构造重载。
+ */
+class CommonResultTest {
+
+    @Test
+    void success_noArgs_shouldUseDefaultMessage() {
+        CommonResult<Void> result = CommonResult.success();
+
+        assertEquals(200, result.getCode());
+        assertEquals("请求成功", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void success_withMessage_shouldKeepMessage() {
+        CommonResult<Void> result = CommonResult.success("操作完成");
+
+        assertEquals(200, result.getCode());
+        assertEquals("操作完成", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void success_withData_shouldUseDefaultMessage() {
+        // 注意：CommonResult.success(String) 重载优先匹配 message 参数，
+        // 必须先向上转型为 Object 才能命中 success(T data) 这个工厂方法
+        CommonResult<Object> result = CommonResult.success((Object) "数据");
+
+        assertEquals(200, result.getCode());
+        assertEquals("请求成功", result.getMessage());
+        assertEquals("数据", result.getData());
+    }
+
+    @Test
+    void success_withMessageAndData_shouldKeepBoth() {
+        CommonResult<String> result = CommonResult.success("操作完成", "数据");
+
+        assertEquals(200, result.getCode());
+        assertEquals("操作完成", result.getMessage());
+        assertEquals("数据", result.getData());
+    }
+
+    @Test
+    void twoArgConstructor_shouldDefaultNullData() {
+        CommonResult<String> result = new CommonResult<>(400, "参数错误");
+
+        assertEquals(400, result.getCode());
+        assertEquals("参数错误", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void error_shouldUseBadRequest() {
+        CommonResult<Void> result = CommonResult.error("请求失败");
+
+        assertEquals(400, result.getCode());
+        assertEquals("请求失败", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void notFind_noArgs_shouldUseDefaultMessage() {
+        CommonResult<Void> result = CommonResult.notFind();
+
+        assertEquals(404, result.getCode());
+        assertEquals("请求的资源不存在", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void notFind_withMessage_shouldKeepMessage() {
+        CommonResult<Void> result = CommonResult.notFind("找不到任务");
+
+        assertEquals(404, result.getCode());
+        assertEquals("找不到任务", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void serverError_shouldUse500() {
+        CommonResult<Void> result = CommonResult.serverError("服务器错误");
+
+        assertEquals(500, result.getCode());
+        assertEquals("服务器错误", result.getMessage());
+        assertNull(result.getData());
+    }
+
+    @Test
+    void settersAndGetters_shouldWork() {
+        CommonResult<String> result = new CommonResult<>();
+        result.setCode(200);
+        result.setMessage("ok");
+        result.setData("d");
+
+        assertEquals(200, result.getCode());
+        assertEquals("ok", result.getMessage());
+        assertEquals("d", result.getData());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/entity/TestTableEntityTest.java b/src/test/java/com/guo/learningprogresstracker/entity/TestTableEntityTest.java
new file mode 100644
index 0000000..8f78198
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/entity/TestTableEntityTest.java
@@ -0,0 +1,90 @@
+package com.guo.learningprogresstracker.entity;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * TestTableEntity 单元测试：覆盖手写的 equals/hashCode/toString 全部分支。
+ */
+class TestTableEntityTest {
+
+    private TestTableEntity entity(Integer id, String idName) {
+        TestTableEntity entity = new TestTableEntity();
+        entity.setId(id);
+        entity.setIdName(idName);
+        return entity;
+    }
+
+    @Test
+    void equals_sameReference_shouldBeTrue() {
+        TestTableEntity entity = entity(1, "a");
+        assertEquals(entity, entity);
+    }
+
+    @Test
+    void equals_null_shouldBeFalse() {
+        assertNotEquals(entity(1, "a"), null);
+    }
+
+    @Test
+    void equals_differentClass_shouldBeFalse() {
+        TestTableEntity entity = entity(1, "a");
+        TestTableEntity subclass = new TestTableEntity() {
+        };
+        subclass.setId(1);
+        subclass.setIdName("a");
+        assertNotEquals(entity, subclass);
+    }
+
+    @Test
+    void equals_sameFields_shouldBeTrue() {
+        assertEquals(entity(1, "a"), entity(1, "a"));
+    }
+
+    @Test
+    void equals_bothFieldsNull_shouldBeTrue() {
+        assertEquals(entity(null, null), entity(null, null));
+    }
+
+    @Test
+    void equals_differentId_shouldBeFalse() {
+        assertNotEquals(entity(1, "a"), entity(2, "a"));
+    }
+
+    @Test
+    void equals_differentIdName_shouldBeFalse() {
+        assertNotEquals(entity(1, "a"), entity(1, "b"));
+    }
+
+    @Test
+    void equals_idNullVsSet_shouldBeFalse() {
+        assertNotEquals(entity(null, "a"), entity(1, "a"));
+    }
+
+    @Test
+    void equals_idNameNullVsSet_shouldBeFalse() {
+        assertNotEquals(entity(1, null), entity(1, "a"));
+    }
+
+    @Test
+    void hashCode_equalEntities_shouldMatch() {
+        assertEquals(entity(1, "a").hashCode(), entity(1, "a").hashCode());
+    }
+
+    @Test
+    void hashCode_nullFields_shouldBeStable() {
+        assertEquals(entity(null, null).hashCode(), entity(null, null).hashCode());
+    }
+
+    @Test
+    void toString_shouldContainFields() {
+        TestTableEntity entity = entity(1, "测试");
+        String text = entity.toString();
+
+        assertTrue(text.contains("TestTableEntity"));
+        assertTrue(text.contains("id=1"));
+        assertTrue(text.contains("idName=测试"));
+        assertTrue(text.contains("serialVersionUID=1"));
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/enums/StudySessionStateEnumTest.java b/src/test/java/com/guo/learningprogresstracker/enums/StudySessionStateEnumTest.java
new file mode 100644
index 0000000..1fb7e49
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/enums/StudySessionStateEnumTest.java
@@ -0,0 +1,18 @@
+package com.guo.learningprogresstracker.enums;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * StudySessionStateEnum 单元测试：覆盖 getDescription 未覆盖行。
+ */
+class StudySessionStateEnumTest {
+
+    @Test
+    void descriptions_shouldMatchConstants() {
+        assertEquals("进行中", StudySessionStateEnum.ONGOING.getDescription());
+        assertEquals("暂停", StudySessionStateEnum.PAUSED.getDescription());
+        assertEquals("已结束", StudySessionStateEnum.ENDED.getDescription());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/enums/TaskApplicationStatusEnumTest.java b/src/test/java/com/guo/learningprogresstracker/enums/TaskApplicationStatusEnumTest.java
new file mode 100644
index 0000000..04eb893
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/enums/TaskApplicationStatusEnumTest.java
@@ -0,0 +1,40 @@
+package com.guo.learningprogresstracker.enums;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * TaskApplicationStatusEnum 单元测试：覆盖 fromCodeOrDefault 的未知码兜底/合法码分支。
+ */
+class TaskApplicationStatusEnumTest {
+
+    @Test
+    void fromCodeOrDefault_nullOrBlank_shouldReturnTodo() {
+        assertSame(TaskApplicationStatusEnum.TODO, TaskApplicationStatusEnum.fromCodeOrDefault(null));
+        assertSame(TaskApplicationStatusEnum.TODO, TaskApplicationStatusEnum.fromCodeOrDefault(""));
+        assertSame(TaskApplicationStatusEnum.TODO, TaskApplicationStatusEnum.fromCodeOrDefault("   "));
+    }
+
+    @Test
+    void fromCodeOrDefault_validCode_shouldMatchIgnoringCase() {
+        assertSame(TaskApplicationStatusEnum.TODO, TaskApplicationStatusEnum.fromCodeOrDefault("todo"));
+        assertSame(TaskApplicationStatusEnum.DOING, TaskApplicationStatusEnum.fromCodeOrDefault("doing"));
+        assertSame(TaskApplicationStatusEnum.DONE, TaskApplicationStatusEnum.fromCodeOrDefault("DONE"));
+    }
+
+    @Test
+    void fromCodeOrDefault_unknownCode_shouldFallbackTodo() {
+        assertSame(TaskApplicationStatusEnum.TODO, TaskApplicationStatusEnum.fromCodeOrDefault("not-a-status"));
+    }
+
+    @Test
+    void codeAndDescription_shouldMatchConstants() {
+        assertEquals("TODO", TaskApplicationStatusEnum.TODO.getCode());
+        assertEquals("待应用", TaskApplicationStatusEnum.TODO.getDescription());
+        assertEquals("DOING", TaskApplicationStatusEnum.DOING.getCode());
+        assertEquals("应用中", TaskApplicationStatusEnum.DOING.getDescription());
+        assertEquals("DONE", TaskApplicationStatusEnum.DONE.getCode());
+        assertEquals("已完成", TaskApplicationStatusEnum.DONE.getDescription());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/exception/AppExceptionTest.java b/src/test/java/com/guo/learningprogresstracker/exception/AppExceptionTest.java
new file mode 100644
index 0000000..7afa7f2
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/exception/AppExceptionTest.java
@@ -0,0 +1,18 @@
+package com.guo.learningprogresstracker.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * AppException 构造与消息测试。
+ */
+class AppExceptionTest {
+
+    @Test
+    void constructor_shouldKeepMessage() {
+        AppException ex = new AppException("数据库连接失败");
+
+        assertEquals("数据库连接失败", ex.getMessage());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/exception/OperationFailedExceptionTest.java b/src/test/java/com/guo/learningprogresstracker/exception/OperationFailedExceptionTest.java
new file mode 100644
index 0000000..1999ec9
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/exception/OperationFailedExceptionTest.java
@@ -0,0 +1,25 @@
+package com.guo.learningprogresstracker.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * OperationFailedException 构造与消息测试。
+ */
+class OperationFailedExceptionTest {
+
+    @Test
+    void noArgConstructor_messageShouldBeNull() {
+        OperationFailedException ex = new OperationFailedException();
+
+        assertNull(ex.getMessage());
+    }
+
+    @Test
+    void messageConstructor_shouldKeepMessage() {
+        OperationFailedException ex = new OperationFailedException("操作失败");
+
+        assertEquals("操作失败", ex.getMessage());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/mapStruct/FragmentsConvertTest.java b/src/test/java/com/guo/learningprogresstracker/mapStruct/FragmentsConvertTest.java
new file mode 100644
index 0000000..f65cc78
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/mapStruct/FragmentsConvertTest.java
@@ -0,0 +1,29 @@
+package com.guo.learningprogresstracker.mapStruct;
+
+import com.guo.learningprogresstracker.dto.request.CreateFragmentsRequest;
+import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * 仅触发 MAPPER 字段初始化（Mappers.getMapper 加载生成的 Impl），
+ * 覆盖接口内的初始化行；生成实现已被 JaCoCo 排除，不做映射细节断言。
+ */
+class FragmentsConvertTest {
+
+    @Test
+    void mapper_shouldBeInitializedAndConvertRequest() {
+        assertNotNull(FragmentsConvert.MAPPER);
+
+        CreateFragmentsRequest request = new CreateFragmentsRequest();
+        request.setSessionNum("SESSION_A");
+        request.setContent("学习内容");
+
+        StudyReportFragmentsEntity entity = FragmentsConvert.MAPPER.toFragmentsEntity(request);
+
+        assertNotNull(entity);
+        assertEquals("SESSION_A", entity.getSessionNum());
+        assertEquals("学习内容", entity.getContent());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/mapStruct/StudySessionConvertTest.java b/src/test/java/com/guo/learningprogresstracker/mapStruct/StudySessionConvertTest.java
new file mode 100644
index 0000000..44e4545
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/mapStruct/StudySessionConvertTest.java
@@ -0,0 +1,29 @@
+package com.guo.learningprogresstracker.mapStruct;
+
+import com.guo.learningprogresstracker.dto.response.StudySessionResponse;
+import com.guo.learningprogresstracker.entity.StudySessionsEntity;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * 仅触发 MAPPER 字段初始化（Mappers.getMapper 加载生成的 Impl），
+ * 覆盖接口内的初始化行；生成实现已被 JaCoCo 排除，不做映射细节断言。
+ */
+class StudySessionConvertTest {
+
+    @Test
+    void mapper_shouldBeInitializedAndConvertEntity() {
+        assertNotNull(StudySessionConvert.MAPPER);
+
+        StudySessionsEntity entity = new StudySessionsEntity();
+        entity.setSessionNum("SESSION_A");
+        entity.setSessionState("ONGOING");
+
+        StudySessionResponse response = StudySessionConvert.MAPPER.toStudySessionResponse(entity);
+
+        assertNotNull(response);
+        assertEquals("SESSION_A", response.getSessionNum());
+        assertEquals("ONGOING", response.getSessionState());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/AiServiceClientTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/AiServiceClientTest.java
new file mode 100644
index 0000000..b1a735e
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/AiServiceClientTest.java
@@ -0,0 +1,231 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.guo.learningprogresstracker.support.TestHttpServer;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * AiServiceClient 单元测试：基于本地 TestHttpServer 覆盖异步 submit + poll 全部分支。
+ */
+class AiServiceClientTest extends TestHttpServer {
+
+    private AiServiceClient newClient(String url, int timeoutSeconds) {
+        AiServiceClient client = new AiServiceClient();
+        client.setUrl(url);
+        client.setTimeoutSeconds(timeoutSeconds);
+        client.init();
+        return client;
+    }
+
+    // ============ 配置状态 ============
+
+    @Test
+    void isConfigured_dependsOnUrl() {
+        AiServiceClient client = new AiServiceClient();
+        assertFalse(client.isConfigured());
+        client.setUrl("http://localhost:5199");
+        assertTrue(client.isConfigured());
+        client.setUrl("   ");
+        assertFalse(client.isConfigured());
+        // init 的两条日志分支（未配置 / 已配置）
+        client.init();
+        client.setUrl(baseUrl());
+        client.init();
+    }
+
+    @Test
+    void publicApis_returnEmptyWhenNotConfigured() {
+        AiServiceClient client = new AiServiceClient();
+        client.setTimeoutSeconds(1);
+        client.init();
+        assertTrue(client.aggregateReport("任务", List.of("片段"), null).isEmpty());
+        assertTrue(client.generateMindMap("任务", "描述", List.of("报告")).isEmpty());
+        assertTrue(client.compareRecall("任务", "标准大纲", "回忆大纲").isEmpty());
+    }
+
+    // ============ aggregateReport ============
+
+    @Test
+    void aggregateReport_returnsEmptyWhenFragmentsNullOrEmpty() {
+        AiServiceClient client = newClient(baseUrl(), 1);
+        assertTrue(client.aggregateReport("任务", null, null).isEmpty());
+        assertTrue(client.aggregateReport("任务", List.of(), null).isEmpty());
+    }
+
+    @Test
+    void aggregateReport_success_coversExpectationBothBranches() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t1\"}");
+        route("GET", "/ai/tasks/t1", 200, "{\"status\":\"done\",\"result\":{\"report\":\"聚合报告内容\"}}");
+        AiServiceClient client = newClient(baseUrl(), 2);
+
+        // expectation 为 null → 参数不含 expectation
+        Optional<String> noExpectation = client.aggregateReport("任务A", List.of("片段1"), null);
+        assertTrue(noExpectation.isPresent());
+        assertEquals("聚合报告内容", noExpectation.get());
+
+        // expectation 非空 → 参数带 expectation
+        Optional<String> withExpectation = client.aggregateReport("任务A", List.of("片段1"), "期望目标");
+        assertTrue(withExpectation.isPresent());
+        assertEquals("聚合报告内容", withExpectation.get());
+
+        assertEquals("application/json", requestHeader("POST", "/ai/tasks", "Content-Type"));
+    }
+
+    // ============ generateMindMap ============
+
+    @Test
+    void generateMindMap_success_returnsOutline() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t2\"}");
+        route("GET", "/ai/tasks/t2", 200,
+                "{\"status\":\"done\",\"result\":{\"outline\":\"- 分支A\\n- 分支B\"}}");
+        AiServiceClient client = newClient(baseUrl(), 2);
+
+        Optional<String> outline = client.generateMindMap("任务A", null, List.of("报告内容"));
+        assertTrue(outline.isPresent());
+        assertEquals("- 分支A\n- 分支B", outline.get());
+    }
+
+    @Test
+    void generateMindMap_outlineMissing_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t3\"}");
+        route("GET", "/ai/tasks/t3", 200, "{\"status\":\"done\",\"result\":{}}");
+        AiServiceClient client = newClient(baseUrl(), 2);
+
+        assertTrue(client.generateMindMap("任务A", "描述", List.of("报告内容")).isEmpty());
+    }
+
+    @Test
+    void generateMindMap_outlineBlank_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t4\"}");
+        route("GET", "/ai/tasks/t4", 200, "{\"status\":\"done\",\"result\":{\"outline\":\"   \"}}");
+        AiServiceClient client = newClient(baseUrl(), 2);
+
+        assertTrue(client.generateMindMap("任务A", "描述", List.of("报告内容")).isEmpty());
+    }
+
+    // ============ compareRecall ============
+
+    @Test
+    void compareRecall_success_returnsJsonResult() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t5\"}");
+        route("GET", "/ai/tasks/t5", 200,
+                "{\"status\":\"done\",\"result\":{\"matches\":[],\"evaluation\":\"ok\"}}");
+        AiServiceClient client = newClient(baseUrl(), 2);
+
+        Optional<JsonNode> result = client.compareRecall("任务A", "标准大纲", "回忆大纲");
+        assertTrue(result.isPresent());
+        assertEquals("ok", result.get().path("evaluation").asText());
+    }
+
+    // ============ 提交阶段失败 ============
+
+    @Test
+    void submitTask_non201_returnsEmpty() {
+        route("POST", "/ai/tasks", 500, "server error body");
+        AiServiceClient client = newClient(baseUrl(), 1);
+
+        assertTrue(client.compareRecall("任务A", "标准大纲", "回忆大纲").isEmpty());
+    }
+
+    @Test
+    void submitTask_201WithoutTaskId_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"message\":\"accepted\"}");
+        AiServiceClient client = newClient(baseUrl(), 1);
+
+        assertTrue(client.compareRecall("任务A", "标准大纲", "回忆大纲").isEmpty());
+    }
+
+    @Test
+    void submitTask_201BlankTaskId_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"   \"}");
+        AiServiceClient client = newClient(baseUrl(), 1);
+
+        assertTrue(client.aggregateReport("任务A", List.of("片段"), null).isEmpty());
+    }
+
+    @Test
+    void submitTask_connectionRefused_returnsEmpty() {
+        AiServiceClient client = newClient("http://localhost:1", 1);
+
+        assertTrue(client.generateMindMap("任务A", "描述", List.of("报告内容")).isEmpty());
+    }
+
+    // ============ 轮询阶段 ============
+
+    @Test
+    void pollTask_failed_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t8\"}");
+        route("GET", "/ai/tasks/t8", 200, "{\"status\":\"failed\",\"error\":\"模型超时\"}");
+        AiServiceClient client = newClient(baseUrl(), 2);
+
+        assertTrue(client.compareRecall("任务A", "标准大纲", "回忆大纲").isEmpty());
+    }
+
+    @Test
+    void pollTask_404_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t9\"}");
+        route("GET", "/ai/tasks/t9", 404, "{\"error\":\"not found\"}");
+        AiServiceClient client = newClient(baseUrl(), 2);
+
+        assertTrue(client.compareRecall("任务A", "标准大纲", "回忆大纲").isEmpty());
+    }
+
+    @Test
+    void pollTask_unknownStatus_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t10\"}");
+        route("GET", "/ai/tasks/t10", 200, "{\"status\":\"weird\"}");
+        AiServiceClient client = newClient(baseUrl(), 2);
+
+        assertTrue(client.compareRecall("任务A", "标准大纲", "回忆大纲").isEmpty());
+    }
+
+    @Test
+    void pollTask_pending_thenDeadlineExpires_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t11\"}");
+        route("GET", "/ai/tasks/t11", 200, "{\"status\":\"pending\"}");
+        AiServiceClient client = newClient(baseUrl(), 1);
+
+        long start = System.currentTimeMillis();
+        Optional<JsonNode> result = client.compareRecall("任务A", "标准大纲", "回忆大纲");
+        long elapsed = System.currentTimeMillis() - start;
+
+        assertTrue(result.isEmpty());
+        // pending 后退避 2s，超过 1s 的 deadline 后退出
+        assertTrue(elapsed >= 2000, "应等待退避后超时退出，实际 " + elapsed + "ms");
+        assertTrue(elapsed < 10000, "不应无限轮询，实际 " + elapsed + "ms");
+    }
+
+    @Test
+    void pollTask_running_thenDeadlineExpires_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t12\"}");
+        route("GET", "/ai/tasks/t12", 200, "{\"status\":\"running\"}");
+        AiServiceClient client = newClient(baseUrl(), 1);
+
+        long start = System.currentTimeMillis();
+        Optional<String> result = client.aggregateReport("任务A", List.of("片段"), null);
+        long elapsed = System.currentTimeMillis() - start;
+
+        assertTrue(result.isEmpty());
+        assertTrue(elapsed >= 2000, "应等待退避后超时退出，实际 " + elapsed + "ms");
+    }
+
+    @Test
+    void pollTask_non200Continues_thenDeadlineExpires_returnsEmpty() {
+        route("POST", "/ai/tasks", 201, "{\"taskId\":\"t13\"}");
+        route("GET", "/ai/tasks/t13", 503, "temporarily unavailable");
+        AiServiceClient client = newClient(baseUrl(), 1);
+
+        long start = System.currentTimeMillis();
+        Optional<JsonNode> result = client.compareRecall("任务A", "标准大纲", "回忆大纲");
+        long elapsed = System.currentTimeMillis() - start;
+
+        assertTrue(result.isEmpty());
+        // 503 → 退避 2s → continue → deadline 过期退出
+        assertTrue(elapsed >= 2000, "应等待退避后超时退出，实际 " + elapsed + "ms");
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/BuiltinMindMapGeneratorTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/BuiltinMindMapGeneratorTest.java
new file mode 100644
index 0000000..2a0b87d
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/BuiltinMindMapGeneratorTest.java
@@ -0,0 +1,198 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.guo.learningprogresstracker.entity.StudyReportsEntity;
+import com.guo.learningprogresstracker.entity.TaskApplicationEntity;
+import com.guo.learningprogresstracker.entity.TaskEntity;
+import com.guo.learningprogresstracker.utils.MindMapNode;
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * BuiltinMindMapGenerator 单元测试：会话分组、标题截断、应用场景、同级去重。
+ */
+class BuiltinMindMapGeneratorTest {
+
+    private final BuiltinMindMapGenerator generator = new BuiltinMindMapGenerator();
+
+    private static TaskEntity task() {
+        TaskEntity task = new TaskEntity();
+        task.setTaskNum("T9");
+        task.setTaskName("学习Java");
+        task.setTaskDescription("系统学习Java基础");
+        return task;
+    }
+
+    private static StudyReportsEntity report(String sessionNum, String content, Integer id) {
+        StudyReportsEntity report = new StudyReportsEntity();
+        report.setSessionNum(sessionNum);
+        report.setContent(content);
+        report.setId(id);
+        return report;
+    }
+
+    private static TaskApplicationEntity app(Integer id, String title, String description) {
+        TaskApplicationEntity application = new TaskApplicationEntity();
+        application.setId(id);
+        application.setTitle(title);
+        application.setDescription(description);
+        return application;
+    }
+
+    @Test
+    void isAvailable_alwaysTrue_andNameIsBuiltin() {
+        assertTrue(generator.isAvailable());
+        assertEquals("BUILTIN", generator.generatorName());
+    }
+
+    @Test
+    void generate_nullOrEmptyReports_returnsEmpty() {
+        assertTrue(generator.generate(task(), null, List.of(), null).isEmpty());
+        assertTrue(generator.generate(task(), List.of(), List.of(), null).isEmpty());
+    }
+
+    @Test
+    void generate_groupsBySession_withDatePrefixAndRootFallbackTitle() {
+        TaskEntity task = task();
+        task.setTaskName(null); // → 兜底"学习任务"
+        task.setTaskDescription("任务描述内容");
+
+        StudyReportsEntity withDate = report("S1", "会话一的学习内容", 1);
+        withDate.setCreatedTime(LocalDateTime.of(2024, 5, 6, 10, 30));
+        StudyReportsEntity noDate = report("S2", "会话二的学习内容", 2);
+        noDate.setCreatedTime(null);
+
+        MindMapNode root = generator.generate(task, List.of(withDate, noDate), List.of(), null).get();
+
+        assertEquals("学习任务", root.getTitle());
+        assertEquals("任务描述内容", root.getNotes());
+        assertEquals(2, root.getChildren().size());
+
+        // 日期前缀分支
+        MindMapNode dated = root.getChildren().stream()
+                .filter(n -> n.getTitle().startsWith("05-06"))
+                .findFirst().orElseThrow();
+        assertEquals("05-06 会话一的学习内容", dated.getTitle());
+
+        // createdTime 为 null → 无前缀
+        MindMapNode undated = root.getChildren().stream()
+                .filter(n -> !n.getTitle().startsWith("05-06"))
+                .findFirst().orElseThrow();
+        assertEquals("会话二的学习内容", undated.getTitle());
+
+        // 报告子节点：title / notes / sourceType / sourceId
+        MindMapNode reportNode = dated.getChildren().get(0);
+        assertEquals("会话一的学习内容", reportNode.getTitle());
+        assertEquals("会话一的学习内容", reportNode.getNotes());
+        assertEquals("REPORT", reportNode.getSourceType());
+        assertEquals(1, reportNode.getSourceId());
+    }
+
+    @Test
+    void generate_truncatesTitlesAt60CharsWithEllipsis() {
+        String exact60 = "界".repeat(60);
+        String long70 = "长".repeat(70);
+        StudyReportsEntity r1 = report("S1", exact60, 1);
+        StudyReportsEntity r2 = report("S1", long70, 2);
+
+        MindMapNode root = generator.generate(task(), List.of(r1, r2), List.of(), null).get();
+
+        // 会话标题取第一条报告，恰好 60 字不截断
+        MindMapNode session = root.getChildren().get(0);
+        assertEquals(exact60, session.getTitle());
+
+        assertEquals(exact60, session.getChildren().get(0).getTitle());
+        // 超过 60 字 → 截断 + 省略号
+        MindMapNode truncated = session.getChildren().get(1);
+        assertEquals("长".repeat(60) + "…", truncated.getTitle());
+        assertEquals(61, truncated.getTitle().length());
+        assertEquals(long70, truncated.getNotes());
+        assertEquals("REPORT", truncated.getSourceType());
+        assertEquals(2, truncated.getSourceId());
+    }
+
+    @Test
+    void generate_skipsNullOrBlankReportContent() {
+        StudyReportsEntity nullContent = report("S1", null, 1);
+        StudyReportsEntity blankContent = report("S1", "  ", 2);
+        StudyReportsEntity valid = report("S1", "有效学习内容", 3);
+
+        MindMapNode root =
+                generator.generate(task(), List.of(nullContent, blankContent, valid), List.of(), null).get();
+
+        MindMapNode session = root.getChildren().get(0);
+        // 会话标题取第一条报告内容，null → truncate 返回 ""
+        assertEquals("", session.getTitle());
+        // null / 空白内容报告被跳过
+        assertEquals(1, session.getChildren().size());
+        assertEquals("有效学习内容", session.getChildren().get(0).getTitle());
+    }
+
+    @Test
+    void generate_applications_nullOrEmptyAddsNoBranch() {
+        MindMapNode withNull =
+                generator.generate(task(), List.of(report("S1", "内容", 1)), null, null).get();
+        assertTrue(withNull.getChildren().stream().noneMatch(n -> "应用场景".equals(n.getTitle())));
+
+        MindMapNode withEmpty =
+                generator.generate(task(), List.of(report("S1", "内容", 1)), List.of(), null).get();
+        assertTrue(withEmpty.getChildren().stream().noneMatch(n -> "应用场景".equals(n.getTitle())));
+    }
+
+    @Test
+    void generate_applications_skipsBlankTitle_nullDescriptionToEmptyNotes() {
+        TaskApplicationEntity nullTitle = app(1, null, "描述");
+        TaskApplicationEntity blankTitle = app(2, "  ", "描述");
+        TaskApplicationEntity valid = app(3, "缓存设计", null);
+
+        MindMapNode root = generator.generate(task(),
+                List.of(report("S1", "内容", 9)), List.of(nullTitle, blankTitle, valid), null).get();
+
+        MindMapNode appNode = root.getChildren().stream()
+                .filter(n -> "应用场景".equals(n.getTitle()))
+                .findFirst().orElseThrow();
+        // title 为 null / 空白的应用被跳过
+        assertEquals(1, appNode.getChildren().size());
+        MindMapNode child = appNode.getChildren().get(0);
+        assertEquals("缓存设计", child.getTitle());
+        // description 为 null → notes 为空串
+        assertEquals("", child.getNotes());
+        assertEquals("APPLICATION", child.getSourceType());
+        assertEquals(3, child.getSourceId());
+    }
+
+    @Test
+    void generate_deduplicatesSameLevelTitles_keepsLongerNotes() {
+        // 两条报告标准化后同名："重复" 与 "重复。" → 合并，notes 长者胜
+        StudyReportsEntity r1 = report("S1", "重复", 1);
+        StudyReportsEntity r2 = report("S1", "重复。", 2);
+
+        MindMapNode root = generator.generate(task(), List.of(r1, r2), List.of(), null).get();
+
+        MindMapNode session = root.getChildren().get(0);
+        assertEquals(1, session.getChildren().size());
+        MindMapNode merged = session.getChildren().get(0);
+        assertEquals("重复", merged.getTitle());
+        assertEquals("重复。", merged.getNotes());
+    }
+
+    @Test
+    void generate_deduplicatesSessionNodes_mergesChildren() {
+        // 两个会话首条报告内容相同 → 会话节点同名合并，报告子节点拼接
+        StudyReportsEntity r1 = report("S1", "相同会话内容", 1);
+        StudyReportsEntity r2 = report("S2", "相同会话内容", 2);
+
+        MindMapNode root = generator.generate(task(), List.of(r1, r2), List.of(), null).get();
+
+        assertEquals(1, root.getChildren().size());
+        MindMapNode session = root.getChildren().get(0);
+        assertEquals("相同会话内容", session.getTitle());
+        // 递归去重：拼接进来的两个同名报告节点再次合并为一个（notes 相同长度保留前者）
+        assertEquals(1, session.getChildren().size());
+        assertEquals("相同会话内容", session.getChildren().get(0).getTitle());
+        assertEquals("相同会话内容", session.getChildren().get(0).getNotes());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/LoginServiceImplTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/LoginServiceImplTest.java
new file mode 100644
index 0000000..da59260
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/LoginServiceImplTest.java
@@ -0,0 +1,92 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import cn.dev33.satoken.SaManager;
+import cn.dev33.satoken.context.SaTokenContext;
+import cn.dev33.satoken.context.SaTokenContextForThreadLocal;
+import cn.dev33.satoken.context.SaTokenContextForThreadLocalStorage;
+import cn.dev33.satoken.context.model.SaRequest;
+import cn.dev33.satoken.context.model.SaResponse;
+import cn.dev33.satoken.context.model.SaStorage;
+import cn.dev33.satoken.stp.StpUtil;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * LoginServiceImpl 单元测试：不启动 Spring，利用 Sa-Token 提供的
+ * ThreadLocal 上下文（SaTokenContextForThreadLocal）伪造 Request/Response/Storage，
+ * 配合默认的内存版 SaTokenDao 覆盖 login/logout 两行逻辑。
+ */
+class LoginServiceImplTest {
+
+    private final LoginServiceImpl loginService = new LoginServiceImpl();
+    private final SaTokenContextForThreadLocal threadLocalContext = new SaTokenContextForThreadLocal();
+    private SaTokenContext previousContext;
+
+    @BeforeEach
+    void setUp() {
+        previousContext = SaManager.getSaTokenContext();
+        SaManager.setSaTokenContext(threadLocalContext);
+        SaRequest request = Mockito.mock(SaRequest.class);
+        SaResponse response = Mockito.mock(SaResponse.class);
+        SaTokenContextForThreadLocalStorage.setBox(request, response, new InMemoryStorage());
+    }
+
+    @AfterEach
+    void tearDown() {
+        SaTokenContextForThreadLocalStorage.clearBox();
+        SaManager.setSaTokenContext(previousContext);
+    }
+
+    /**
+     * 基于内存 Map 的 SaStorage 实现，供 Sa-Token 存取"本次会话刚创建的 token"标记。
+     */
+    static class InMemoryStorage implements SaStorage {
+        private final Map<String, Object> data = new HashMap<>();
+
+        @Override
+        public SaStorage set(String key, Object value) {
+            data.put(key, value);
+            return this;
+        }
+
+        @Override
+        public Object get(String key) {
+            return data.get(key);
+        }
+
+        @Override
+        public SaStorage delete(String key) {
+            data.remove(key);
+            return this;
+        }
+
+        @Override
+        public Object getSource() {
+            return data;
+        }
+    }
+
+    @Test
+    void login_shouldReturnTokenValue() throws Exception {
+        String token = loginService.login("user-1");
+
+        assertNotNull(token, "登录成功后应返回 token");
+        assertEquals(token, StpUtil.getTokenInfo().getTokenValue());
+    }
+
+    @Test
+    void logout_shouldClearLoginState() throws Exception {
+        loginService.login("user-2");
+
+        loginService.logout();
+
+        assertFalse(StpUtil.isLogin(), "登出后不应再处于登录态");
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/PriorityWeightsServiceImplTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/PriorityWeightsServiceImplTest.java
new file mode 100644
index 0000000..165dbc6
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/PriorityWeightsServiceImplTest.java
@@ -0,0 +1,152 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.guo.learningprogresstracker.entity.TaskEntity;
+import com.guo.learningprogresstracker.entity.UserPriorityWeightsEntity;
+import com.guo.learningprogresstracker.exception.ErrorParameterException;
+import com.guo.learningprogresstracker.mapper.TasksMapper;
+import com.guo.learningprogresstracker.mapper.UserPriorityWeightsMapper;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+/**
+ * PriorityWeightsServiceImpl 单元测试：纯 Mockito。
+ * 覆盖 get/update 权重的全部分支：无记录默认、新建、更新并重算、校验失败等。
+ */
+@ExtendWith(MockitoExtension.class)
+class PriorityWeightsServiceImplTest {
+
+    @InjectMocks
+    private PriorityWeightsServiceImpl priorityWeightsService;
+
+    @Mock
+    private UserPriorityWeightsMapper weightsMapper;
+
+    @Mock
+    private TasksMapper tasksMapper;
+
+    @Test
+    void getWeights_existing_shouldReturnStored() {
+        UserPriorityWeightsEntity stored = UserPriorityWeightsEntity.defaults();
+        when(weightsMapper.selectOne(any())).thenReturn(stored);
+
+        assertSame(stored, priorityWeightsService.getWeights());
+    }
+
+    @Test
+    void getWeights_missing_shouldReturnDefaults() {
+        when(weightsMapper.selectOne(any())).thenReturn(null);
+
+        UserPriorityWeightsEntity weights = priorityWeightsService.getWeights();
+
+        assertEquals(0.35, weights.getUrgencyWeight(), 0.0001);
+        assertEquals(0.25, weights.getImportanceWeight(), 0.0001);
+        assertEquals(0.20, weights.getContentDifficultyWeight(), 0.0001);
+        assertEquals(0.10, weights.getFutureValueWeight(), 0.0001);
+        assertEquals(0.10, weights.getSubjectivePriorityWeight(), 0.0001);
+    }
+
+    /**
+     * 无既有记录 → insert 新建，任务列表为空时不触发重算循环体
+     */
+    @Test
+    void saveWeights_noExistingRecord_shouldInsert() throws Exception {
+        UserPriorityWeightsEntity weights = UserPriorityWeightsEntity.defaults();
+        when(weightsMapper.selectOne(any())).thenReturn(null);
+        when(tasksMapper.selectList(any())).thenReturn(List.of());
+
+        UserPriorityWeightsEntity result = priorityWeightsService.saveWeights(weights);
+
+        assertSame(weights, result);
+        verify(weightsMapper).insert(weights);
+        verify(weightsMapper, never()).updateById(any(UserPriorityWeightsEntity.class));
+        verify(tasksMapper, never()).updateById(any(TaskEntity.class));
+    }
+
+    /**
+     * 已有记录 → 复用其 id 更新，并用新权重重算全部任务（覆盖维度为 null 与非 null 的 orZero 分支）
+     */
+    @Test
+    void saveWeights_existingRecord_shouldUpdateAndRecalculateAllTasks() throws Exception {
+        UserPriorityWeightsEntity existing = UserPriorityWeightsEntity.defaults();
+        existing.setId(7);
+        when(weightsMapper.selectOne(any())).thenReturn(existing);
+
+        TaskEntity allNullDims = new TaskEntity();
+        allNullDims.setId(1);
+        TaskEntity fullDims = new TaskEntity();
+        fullDims.setId(2);
+        fullDims.setUrgency(2);
+        fullDims.setImportance(3);
+        fullDims.setContentDifficulty(4);
+        fullDims.setFutureValue(5);
+        fullDims.setSubjectivePriority(1);
+        when(tasksMapper.selectList(any())).thenReturn(Arrays.asList(allNullDims, fullDims));
+
+        UserPriorityWeightsEntity weights = UserPriorityWeightsEntity.defaults();
+        UserPriorityWeightsEntity result = priorityWeightsService.saveWeights(weights);
+
+        assertSame(weights, result);
+        assertEquals(Integer.valueOf(7), result.getId());
+        verify(weightsMapper).updateById(weights);
+        verify(weightsMapper, never()).insert(any(UserPriorityWeightsEntity.class));
+        // 全 null 维度按 0 计算优先级
+        assertEquals(0.0, allNullDims.getCalculatedPriority(), 0.0001);
+        // 2*0.35 + 3*0.25 + 4*0.20 + 5*0.10 + 1*0.10 = 2.85
+        assertEquals(2.85, fullDims.getCalculatedPriority(), 0.0001);
+        verify(tasksMapper).updateById(allNullDims);
+        verify(tasksMapper).updateById(fullDims);
+    }
+
+    /**
+     * 权重超过 1 → 校验失败
+     */
+    @Test
+    void saveWeights_weightAboveOne_shouldThrow() {
+        UserPriorityWeightsEntity weights = UserPriorityWeightsEntity.defaults();
+        weights.setUrgencyWeight(1.5);
+
+        ErrorParameterException ex = assertThrows(ErrorParameterException.class,
+                () -> priorityWeightsService.saveWeights(weights));
+
+        assertEquals("权重必须在 0 到 1 之间", ex.getMessage());
+    }
+
+    /**
+     * 负权重 → 校验失败
+     */
+    @Test
+    void saveWeights_negativeWeight_shouldThrow() {
+        UserPriorityWeightsEntity weights = UserPriorityWeightsEntity.defaults();
+        weights.setImportanceWeight(-0.1);
+
+        ErrorParameterException ex = assertThrows(ErrorParameterException.class,
+                () -> priorityWeightsService.saveWeights(weights));
+
+        assertEquals("权重必须在 0 到 1 之间", ex.getMessage());
+    }
+
+    /**
+     * 全部权重为 null → orZero 兜底为 0，总和为 0 ≠ 1 → 抛出求和校验
+     */
+    @Test
+    void saveWeights_allNullWeights_shouldThrowSumError() {
+        UserPriorityWeightsEntity weights = new UserPriorityWeightsEntity();
+
+        ErrorParameterException ex = assertThrows(ErrorParameterException.class,
+                () -> priorityWeightsService.saveWeights(weights));
+
+        assertTrue(ex.getMessage().startsWith("五项权重之和必须为 1，当前为 "));
+        verify(weightsMapper, never()).insert(any(UserPriorityWeightsEntity.class));
+        verify(weightsMapper, never()).updateById(any(UserPriorityWeightsEntity.class));
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/RemoteAiMindMapClientTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/RemoteAiMindMapClientTest.java
new file mode 100644
index 0000000..a474252
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/RemoteAiMindMapClientTest.java
@@ -0,0 +1,120 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.guo.learningprogresstracker.entity.StudyReportsEntity;
+import com.guo.learningprogresstracker.entity.TaskEntity;
+import com.guo.learningprogresstracker.utils.MindMapNode;
+import com.guo.learningprogresstracker.utils.MindMapTreeTool;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.List;
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+/**
+ * RemoteAiMindMapClient 单元测试：mock AiServiceClient，验证降级与大纲解析。
+ */
+@ExtendWith(MockitoExtension.class)
+class RemoteAiMindMapClientTest {
+
+    @Mock
+    private AiServiceClient aiServiceClient;
+
+    @InjectMocks
+    private RemoteAiMindMapClient client;
+
+    private static TaskEntity task() {
+        TaskEntity task = new TaskEntity();
+        task.setTaskNum("T1");
+        task.setTaskName("学习Java入门");
+        task.setTaskDescription("Java 基础学习描述");
+        return task;
+    }
+
+    private static StudyReportsEntity report(String content) {
+        StudyReportsEntity report = new StudyReportsEntity();
+        report.setSessionNum("S1");
+        report.setContent(content);
+        report.setId(1);
+        return report;
+    }
+
+    @Test
+    void isAvailable_followsAiConfiguration() {
+        when(aiServiceClient.isConfigured()).thenReturn(true);
+        assertTrue(client.isAvailable());
+        when(aiServiceClient.isConfigured()).thenReturn(false);
+        assertFalse(client.isAvailable());
+    }
+
+    @Test
+    void generatorName_isAi() {
+        assertEquals("AI", client.generatorName());
+    }
+
+    @Test
+    void generate_notAvailable_returnsEmpty() {
+        when(aiServiceClient.isConfigured()).thenReturn(false);
+        Optional<MindMapNode> result = client.generate(task(), List.of(report("内容")), List.of(), null);
+        assertTrue(result.isEmpty());
+        verify(aiServiceClient, never()).generateMindMap(any(), any(), any());
+    }
+
+    @Test
+    void generate_reportsAllBlank_returnsEmpty() {
+        when(aiServiceClient.isConfigured()).thenReturn(true);
+        StudyReportsEntity nullContent = report(null);
+        StudyReportsEntity blankContent = report("   ");
+
+        Optional<MindMapNode> result =
+                client.generate(task(), List.of(nullContent, blankContent), List.of(), null);
+
+        assertTrue(result.isEmpty());
+        verify(aiServiceClient, never()).generateMindMap(any(), any(), any());
+    }
+
+    @Test
+    void generate_aiReturnsEmpty_returnsEmpty() {
+        when(aiServiceClient.isConfigured()).thenReturn(true);
+        when(aiServiceClient.generateMindMap(any(), any(), any())).thenReturn(Optional.empty());
+
+        Optional<MindMapNode> result = client.generate(task(), List.of(report("内容")), List.of(), null);
+
+        assertTrue(result.isEmpty());
+    }
+
+    @Test
+    void generate_aiReturnsBlankOutline_returnsEmpty() {
+        when(aiServiceClient.isConfigured()).thenReturn(true);
+        when(aiServiceClient.generateMindMap(any(), any(), any())).thenReturn(Optional.of("   "));
+
+        Optional<MindMapNode> result = client.generate(task(), List.of(report("内容")), List.of(), null);
+
+        assertTrue(result.isEmpty());
+    }
+
+    @Test
+    void generate_success_parsesOutlineToTree() {
+        when(aiServiceClient.isConfigured()).thenReturn(true);
+        when(aiServiceClient.generateMindMap(any(), any(), any()))
+                .thenReturn(Optional.of("学习Java\n- 线程基础\n  - 线程安全"));
+
+        Optional<MindMapNode> result =
+                client.generate(task(), List.of(report("报告内容")), List.of(), "前端已有大纲");
+
+        assertTrue(result.isPresent());
+        MindMapNode root = result.get();
+        assertEquals("学习Java", root.getTitle());
+        assertEquals(1, root.getChildren().size());
+        assertEquals("线程基础", root.getChildren().get(0).getTitle());
+        assertEquals("线程安全", root.getChildren().get(0).getChildren().get(0).getTitle());
+        assertEquals(3, MindMapTreeTool.countNodes(root));
+        assertEquals(3, MindMapTreeTool.maxDepth(root));
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/StudyExpectationsServiceImplTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/StudyExpectationsServiceImplTest.java
new file mode 100644
index 0000000..c49f97f
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/StudyExpectationsServiceImplTest.java
@@ -0,0 +1,108 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.guo.learningprogresstracker.entity.StudyExpectationsEntity;
+import com.guo.learningprogresstracker.exception.ErrorParameterException;
+import com.guo.learningprogresstracker.mapper.StudyExpectationsMapper;
+import com.guo.learningprogresstracker.mapper.StudySessionsMapper;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+/**
+ * StudyExpectationsServiceImpl 单元测试：纯 Mockito，不连数据库。
+ * 该服务为普通类构造注入两个 Mapper，直接 @InjectMocks 即可。
+ */
+@ExtendWith(MockitoExtension.class)
+class StudyExpectationsServiceImplTest {
+
+    @InjectMocks
+    private StudyExpectationsServiceImpl studyExpectationsService;
+
+    @Mock
+    private StudyExpectationsMapper studyExpectationsMapper;
+
+    @Mock
+    private StudySessionsMapper studySessionsMapper;
+
+    /**
+     * 场景1：会话不存在 → 抛出，不写库
+     */
+    @Test
+    void upsertExpectation_sessionMissing_shouldThrow() {
+        when(studySessionsMapper.exists(any())).thenReturn(false);
+
+        ErrorParameterException ex = assertThrows(ErrorParameterException.class,
+                () -> studyExpectationsService.upsertExpectation("NOT_EXIST", "预期"));
+
+        assertEquals("这次学习会话不存在或已结束", ex.getMessage());
+        verify(studyExpectationsMapper, never()).insert(any(StudyExpectationsEntity.class));
+        verify(studyExpectationsMapper, never()).updateById(any(StudyExpectationsEntity.class));
+    }
+
+    /**
+     * 场景2：尚无预期记录 → 插入新记录并返回
+     */
+    @Test
+    void upsertExpectation_noExistingRecord_shouldInsert() throws Exception {
+        when(studySessionsMapper.exists(any())).thenReturn(true);
+        when(studyExpectationsMapper.selectOne(any())).thenReturn(null);
+
+        StudyExpectationsEntity result = studyExpectationsService.upsertExpectation("SESSION_A", "掌握微积分");
+
+        assertEquals("SESSION_A", result.getSessionNum());
+        assertEquals("掌握微积分", result.getDescription());
+        verify(studyExpectationsMapper).insert(result);
+        verify(studyExpectationsMapper, never()).updateById(any(StudyExpectationsEntity.class));
+    }
+
+    /**
+     * 场景3：已有预期记录 → 更新描述并返回原实体
+     */
+    @Test
+    void upsertExpectation_existingRecord_shouldUpdate() throws Exception {
+        when(studySessionsMapper.exists(any())).thenReturn(true);
+        StudyExpectationsEntity existing = new StudyExpectationsEntity();
+        existing.setExpectationId(3);
+        existing.setSessionNum("SESSION_A");
+        existing.setDescription("旧预期");
+        when(studyExpectationsMapper.selectOne(any())).thenReturn(existing);
+
+        StudyExpectationsEntity result = studyExpectationsService.upsertExpectation("SESSION_A", "新预期");
+
+        assertSame(existing, result);
+        assertEquals("新预期", result.getDescription());
+        verify(studyExpectationsMapper).updateById(existing);
+        verify(studyExpectationsMapper, never()).insert(any(StudyExpectationsEntity.class));
+    }
+
+    /**
+     * 场景4：按会话编号查询 → 透传 mapper 结果
+     */
+    @Test
+    void getBySessionNum_shouldReturnMapperResult() {
+        StudyExpectationsEntity entity = new StudyExpectationsEntity();
+        entity.setSessionNum("SESSION_A");
+        entity.setDescription("预期内容");
+        when(studyExpectationsMapper.selectOne(any())).thenReturn(entity);
+
+        StudyExpectationsEntity result = studyExpectationsService.getBySessionNum("SESSION_A");
+
+        assertSame(entity, result);
+    }
+
+    /**
+     * 场景5：按会话编号删除 → 委托 mapper.delete
+     */
+    @Test
+    void deleteBySessionNum_shouldDelegateToDelete() {
+        studyExpectationsService.deleteBySessionNum("SESSION_A");
+
+        verify(studyExpectationsMapper).delete(any());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/StudyReportFragmentsServiceImplTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/StudyReportFragmentsServiceImplTest.java
new file mode 100644
index 0000000..e1f79bd
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/StudyReportFragmentsServiceImplTest.java
@@ -0,0 +1,126 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.Wrapper;
+import com.guo.learningprogresstracker.dto.request.CreateFragmentsRequest;
+import com.guo.learningprogresstracker.dto.request.UpdateFragmentsRequest;
+import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
+import com.guo.learningprogresstracker.entity.StudySessionsEntity;
+import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
+import com.guo.learningprogresstracker.mapper.StudySessionsMapper;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+/**
+ * StudyReportFragmentsServiceImpl 单元测试：继承 ServiceImpl，
+ * 参考 StudySessionsServiceImplTest 的手法对 spy 打桩 save/updateById/getById/list，
+ * 避免 baseMapper 为空引发 NPE。
+ */
+@ExtendWith(MockitoExtension.class)
+class StudyReportFragmentsServiceImplTest {
+
+    @Spy
+    @InjectMocks
+    private StudyReportFragmentsServiceImpl studyReportFragmentsService;
+
+    @Mock
+    private StudySessionsMapper studySessionsMapper;
+
+    private CreateFragmentsRequest createRequest(String sessionNum, String content) {
+        CreateFragmentsRequest request = new CreateFragmentsRequest();
+        request.setSessionNum(sessionNum);
+        request.setContent(content);
+        return request;
+    }
+
+    /**
+     * 场景1：会话不存在 → 抛出，不落库
+     */
+    @Test
+    void createFragments_sessionMissing_shouldThrow() {
+        // studySessionsMapper.selectOne 未打桩时默认返回 null，即查不到会话
+
+        NotFindEntitiesException ex = assertThrows(NotFindEntitiesException.class,
+                () -> studyReportFragmentsService.createFragments(createRequest("NOT_EXIST", "内容")));
+
+        assertEquals("这次学习会话不存在或已结束", ex.getMessage());
+        verify(studyReportFragmentsService, never()).save(any(StudyReportFragmentsEntity.class));
+    }
+
+    /**
+     * 场景2：会话存在 → 转换请求并保存残片
+     */
+    @Test
+    void createFragments_success_shouldSaveEntity() throws Exception {
+        StudySessionsEntity session = new StudySessionsEntity();
+        session.setSessionNum("SESSION_A");
+        when(studySessionsMapper.selectOne(any())).thenReturn(session);
+        doReturn(true).when(studyReportFragmentsService).save(any(StudyReportFragmentsEntity.class));
+
+        studyReportFragmentsService.createFragments(createRequest("SESSION_A", "今天学了导数"));
+
+        verify(studyReportFragmentsService).save(argThat(entity ->
+                "SESSION_A".equals(entity.getSessionNum())
+                        && "今天学了导数".equals(entity.getContent())));
+    }
+
+    /**
+     * 场景3：残片不存在 → 抛出
+     */
+    @Test
+    void updateFragments_missing_shouldThrow() {
+        doReturn(null).when(studyReportFragmentsService).getById(any());
+
+        NotFindEntitiesException ex = assertThrows(NotFindEntitiesException.class,
+                () -> studyReportFragmentsService.updateFragments(9, new UpdateFragmentsRequest()));
+
+        assertEquals("这条学习残片不存在或已被删除", ex.getMessage());
+    }
+
+    /**
+     * 场景4：残片存在 → 以指定 id 更新内容
+     */
+    @Test
+    void updateFragments_success_shouldUpdateWithId() throws Exception {
+        StudyReportFragmentsEntity existing = new StudyReportFragmentsEntity();
+        existing.setId(9);
+        existing.setContent("旧内容");
+        doReturn(existing).when(studyReportFragmentsService).getById(any());
+        doReturn(true).when(studyReportFragmentsService).updateById(any(StudyReportFragmentsEntity.class));
+        UpdateFragmentsRequest request = new UpdateFragmentsRequest();
+        request.setContent("更新后的内容");
+
+        studyReportFragmentsService.updateFragments(9, request);
+
+        verify(studyReportFragmentsService).updateById(argThat(entity ->
+                Integer.valueOf(9).equals(entity.getId())
+                        && "更新后的内容".equals(entity.getContent())));
+    }
+
+    /**
+     * 场景5：按会话查询残片列表 → 透传 list 结果
+     */
+    @Test
+    void getFragmentsBySession_shouldReturnList() {
+        StudyReportFragmentsEntity f1 = new StudyReportFragmentsEntity();
+        f1.setContent("残片1");
+        StudyReportFragmentsEntity f2 = new StudyReportFragmentsEntity();
+        f2.setContent("残片2");
+        doReturn(List.of(f1, f2)).when(studyReportFragmentsService).list(any(Wrapper.class));
+
+        List<StudyReportFragmentsEntity> result = studyReportFragmentsService.getFragmentsBySession("SESSION_A");
+
+        assertEquals(2, result.size());
+        assertEquals("残片1", result.get(0).getContent());
+        assertEquals("残片2", result.get(1).getContent());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/TestTableServiceImplTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/TestTableServiceImplTest.java
new file mode 100644
index 0000000..c653249
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/TestTableServiceImplTest.java
@@ -0,0 +1,36 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.guo.learningprogresstracker.entity.TestTableEntity;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+
+/**
+ * TestTableServiceImpl 单元测试：服务仅一个透传查询，覆盖 getById 透传路径。
+ */
+@ExtendWith(MockitoExtension.class)
+class TestTableServiceImplTest {
+
+    @Spy
+    @InjectMocks
+    private TestTableServiceImpl testTableService;
+
+    @Test
+    void getTestEntityById_shouldReturnMapperResult() {
+        TestTableEntity entity = new TestTableEntity();
+        entity.setId(1);
+        entity.setIdName("测试记录");
+        doReturn(entity).when(testTableService).getById(any());
+
+        TestTableEntity result = testTableService.getTestEntityById("1");
+
+        assertSame(entity, result);
+        assertEquals("测试记录", result.getIdName());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/service/impl/UserServiceImplTest.java b/src/test/java/com/guo/learningprogresstracker/service/impl/UserServiceImplTest.java
new file mode 100644
index 0000000..17763a9
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/service/impl/UserServiceImplTest.java
@@ -0,0 +1,61 @@
+package com.guo.learningprogresstracker.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.Wrapper;
+import com.guo.learningprogresstracker.entity.UserEntity;
+import com.guo.learningprogresstracker.exception.AppException;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mindrot.jbcrypt.BCrypt;
+
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+
+/**
+ * UserServiceImpl 单元测试：覆盖认证的用户不存在、密码错误、密码正确三条路径。
+ */
+@ExtendWith(MockitoExtension.class)
+class UserServiceImplTest {
+
+    @Spy
+    @InjectMocks
+    private UserServiceImpl userService;
+
+    private UserEntity userWithPassword(String rawPassword) {
+        UserEntity user = new UserEntity();
+        user.setId("user-1");
+        user.setUserName("admin");
+        user.setUserPassword(BCrypt.hashpw(rawPassword, BCrypt.gensalt()));
+        return user;
+    }
+
+    @Test
+    void authenticate_userMissing_shouldThrow() {
+        doReturn(Optional.empty()).when(userService).getOneOpt(any(Wrapper.class));
+
+        AppException ex = assertThrows(AppException.class, () -> userService.authenticate("ghost", "pw"));
+
+        assertEquals("账号或密码错误！", ex.getMessage());
+    }
+
+    @Test
+    void authenticate_wrongPassword_shouldThrow() {
+        doReturn(Optional.of(userWithPassword("correct-pw"))).when(userService).getOneOpt(any(Wrapper.class));
+
+        AppException ex = assertThrows(AppException.class, () -> userService.authenticate("admin", "wrong-pw"));
+
+        assertEquals("账号或密码错误！", ex.getMessage());
+    }
+
+    @Test
+    void authenticate_correctPassword_shouldReturnUserId() throws Exception {
+        doReturn(Optional.of(userWithPassword("correct-pw"))).when(userService).getOneOpt(any(Wrapper.class));
+
+        assertEquals("user-1", userService.authenticate("admin", "correct-pw"));
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/support/TestHttpServer.java b/src/test/java/com/guo/learningprogresstracker/support/TestHttpServer.java
new file mode 100644
index 0000000..f45e829
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/support/TestHttpServer.java
@@ -0,0 +1,124 @@
+package com.guo.learningprogresstracker.support;
+
+import com.sun.net.httpserver.HttpServer;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.InetSocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.Locale;
+import java.util.List;
+import java.util.Map;
+import java.util.zip.GZIPOutputStream;
+
+/**
+ * 测试用本地 HTTP 服务器（JDK 内置 HttpServer），用于覆盖 TitleFetcher / AiServiceClient 等网络代码。
+ * 每个测试方法独立启停，端口随机，路由按注册顺序匹配（前缀匹配）。
+ */
+public class TestHttpServer {
+
+    private HttpServer server;
+    private final List<Route> routes = new ArrayList<>();
+    /** 请求头按 "METHOD path" 记录（key 小写化），同名后续请求覆盖。 */
+    private final Map<String, Map<String, String>> requestHeadersByPath = new LinkedHashMap<>();
+    private final Map<String, String> lastPaths = new LinkedHashMap<>();
+    private final Map<String, String> lastQueries = new LinkedHashMap<>();
+    private String lastRequestKey;
+
+    private record Route(String method, String pathPrefix, int status, byte[] body,
+                         Map<String, String> headers) {
+    }
+
+    @BeforeEach
+    void startServer() throws IOException {
+        server = HttpServer.create(new InetSocketAddress("localhost", 0), 0);
+        server.createContext("/", exchange -> {
+            String path = exchange.getRequestURI().getPath();
+            String method = exchange.getRequestMethod();
+            Map<String, String> lowercaseHeaders = new LinkedHashMap<>();
+            exchange.getRequestHeaders().forEach((k, v) -> lowercaseHeaders.put(k.toLowerCase(Locale.ROOT), String.join(",", v)));
+            lastRequestKey = method + " " + path;
+            requestHeadersByPath.put(lastRequestKey, lowercaseHeaders);
+            lastPaths.put(method + " " + path, path);
+            lastQueries.put(method + " " + path,
+                    exchange.getRequestURI().getQuery() == null ? "" : exchange.getRequestURI().getQuery());
+            for (Route route : routes) {
+                if (route.method.equals(method) && path.startsWith(route.pathPrefix)) {
+                    if (exchange.getRequestHeaders().getFirst("Content-Length") != null) {
+                        exchange.getRequestBody().readAllBytes();
+                    }
+                    byte[] body = route.body();
+                    Map<String, String> headers = new LinkedHashMap<>(route.headers());
+                    boolean gzip = "gzip".equals(headers.remove("Content-Encoding-Test"));
+                    if (gzip) {
+                        headers.put("Content-Encoding", "gzip");
+                        java.io.ByteArrayOutputStream bos = new java.io.ByteArrayOutputStream();
+                        try (GZIPOutputStream gz = new GZIPOutputStream(bos)) {
+                            gz.write(body);
+                        }
+                        body = bos.toByteArray();
+                    }
+                    headers.forEach(exchange.getResponseHeaders()::set);
+                    if (route.status() >= 300 && route.status() < 400) {
+                        exchange.getResponseHeaders().set("Location", headers.getOrDefault("Location", "/redirected"));
+                    }
+                    exchange.sendResponseHeaders(route.status(), body.length == 0 ? -1 : body.length);
+                    try (OutputStream os = exchange.getResponseBody()) {
+                        os.write(body);
+                    }
+                    return;
+                }
+            }
+            exchange.sendResponseHeaders(404, -1);
+        });
+        server.start();
+    }
+
+    @AfterEach
+    void stopServer() {
+        if (server != null) {
+            server.stop(0);
+        }
+    }
+
+    /** 注册路由；body 为响应体。 */
+    public void route(String method, String pathPrefix, int status, String body) {
+        route(method, pathPrefix, status, body, Map.of());
+    }
+
+    /** 注册路由；headers 里 key=Content-Encoding-Test,value=gzip 表示用 gzip 压缩响应体。 */
+    public void route(String method, String pathPrefix, int status, String body, Map<String, String> headers) {
+        routes.add(new Route(method, pathPrefix, status, body.getBytes(StandardCharsets.UTF_8), headers));
+    }
+
+    /** 服务根地址，如 http://localhost:12345 */
+    public String baseUrl() {
+        return "http://localhost:" + server.getAddress().getPort();
+    }
+
+    /** 最近一次请求的指定请求头值（不区分大小写）。 */
+    public String lastRequestHeader(String name) {
+        Map<String, String> headers = requestHeadersByPath.get(lastRequestKey);
+        return headers == null ? null : headers.get(name.toLowerCase(Locale.ROOT));
+    }
+
+    /** 最近一次请求是否包含指定请求头（不区分大小写）。 */
+    public boolean hasRequestHeader(String name) {
+        return lastRequestHeader(name) != null;
+    }
+
+    /** 指定 "METHOD path" 的请求头值（不区分大小写；该路径尚未请求过返回 null）。 */
+    public String requestHeader(String method, String path, String name) {
+        Map<String, String> headers = requestHeadersByPath.get(method + " " + path);
+        return headers == null ? null : headers.get(name.toLowerCase(Locale.ROOT));
+    }
+
+    /** 最近一次匹配路由的请求查询串。 */
+    public String lastQuery(String method, String path) {
+        return lastQueries.get(method + " " + path);
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/support/TestHttpsServer.java b/src/test/java/com/guo/learningprogresstracker/support/TestHttpsServer.java
new file mode 100644
index 0000000..473da67
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/support/TestHttpsServer.java
@@ -0,0 +1,80 @@
+package com.guo.learningprogresstracker.support;
+
+import com.sun.net.httpserver.HttpsConfigurator;
+import com.sun.net.httpserver.HttpsServer;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.SSLContext;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetSocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.security.KeyStore;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 测试用本地 HTTPS 服务器，使用 src/test/resources/test-keystore.p12 中的自签名证书。
+ * 客户端（TitleFetcher 的信任所有证书逻辑）与之完成真实 TLS 握手，可覆盖信任管理器代码路径。
+ */
+public class TestHttpsServer {
+
+    private HttpsServer server;
+    private final List<Route> routes = new ArrayList<>();
+
+    private record Route(String pathPrefix, int status, byte[] body, String contentType) {
+    }
+
+    @BeforeEach
+    void startServer() throws Exception {
+        KeyStore ks = KeyStore.getInstance("PKCS12");
+        try (InputStream in = getClass().getResourceAsStream("/test-keystore.p12")) {
+            ks.load(in, "changeit".toCharArray());
+        }
+        KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
+        kmf.init(ks, "changeit".toCharArray());
+        SSLContext sslContext = SSLContext.getInstance("TLS");
+        sslContext.init(kmf.getKeyManagers(), null, null);
+
+        server = HttpsServer.create(new InetSocketAddress("localhost", 0), 0);
+        server.setHttpsConfigurator(new HttpsConfigurator(sslContext));
+        server.createContext("/", exchange -> {
+            String path = exchange.getRequestURI().getPath();
+            for (Route route : routes) {
+                if (path.startsWith(route.pathPrefix())) {
+                    exchange.getResponseHeaders().set("Content-Type", route.contentType());
+                    exchange.sendResponseHeaders(route.status(), route.body().length == 0 ? -1 : route.body().length);
+                    try (OutputStream os = exchange.getResponseBody()) {
+                        os.write(route.body());
+                    }
+                    return;
+                }
+            }
+            exchange.sendResponseHeaders(404, -1);
+        });
+        server.start();
+    }
+
+    @AfterEach
+    void stopServer() {
+        if (server != null) {
+            server.stop(0);
+        }
+    }
+
+    public void route(String pathPrefix, int status, String body, String contentType) {
+        routes.add(new Route(pathPrefix, status, body.getBytes(StandardCharsets.UTF_8), contentType));
+    }
+
+    public void html(String pathPrefix, String title) {
+        route(pathPrefix, 200, "<html><head><title>" + title + "</title></head><body>hi</body></html>", "text/html; charset=utf-8");
+    }
+
+    /** 服务 HTTPS 根地址，如 https://localhost:12345 */
+    public String baseUrl() {
+        return "https://localhost:" + server.getAddress().getPort();
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/utils/CalculatedPriorityToolTest.java b/src/test/java/com/guo/learningprogresstracker/utils/CalculatedPriorityToolTest.java
new file mode 100644
index 0000000..d82f9e2
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/utils/CalculatedPriorityToolTest.java
@@ -0,0 +1,38 @@
+package com.guo.learningprogresstracker.utils;
+
+import com.guo.learningprogresstracker.dto.PriorityDto;
+import com.guo.learningprogresstracker.entity.UserPriorityWeightsEntity;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class CalculatedPriorityToolTest {
+
+    private PriorityDto dto(int urgency, int importance, int difficulty, int future, int subjective) {
+        PriorityDto dto = new PriorityDto();
+        dto.setUrgency(urgency);
+        dto.setImportance(importance);
+        dto.setContentDifficulty(difficulty);
+        dto.setFutureValue(future);
+        dto.setSubjectivePriority(subjective);
+        return dto;
+    }
+
+    @Test
+    void calculatedPriority_withDefaultWeights() {
+        // 默认权重：10*0.35 + 8*0.25 + 5*0.20 + 7*0.10 + 9*0.10 = 8.1
+        assertEquals(8.1, CalculatedPriorityTool.calculatedPriority(dto(10, 8, 5, 7, 9)), 1e-9);
+    }
+
+    @Test
+    void calculatedPriority_withCustomWeights() {
+        UserPriorityWeightsEntity weights = new UserPriorityWeightsEntity();
+        weights.setUrgencyWeight(1.0);
+        weights.setImportanceWeight(1.0);
+        weights.setContentDifficultyWeight(1.0);
+        weights.setFutureValueWeight(1.0);
+        weights.setSubjectivePriorityWeight(1.0);
+        // 权重全为 1 时等于各维度求和：10+8+5+7+9 = 39
+        assertEquals(39.0, CalculatedPriorityTool.calculatedPriority(dto(10, 8, 5, 7, 9), weights), 1e-9);
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/utils/GenerateNumToolTest.java b/src/test/java/com/guo/learningprogresstracker/utils/GenerateNumToolTest.java
new file mode 100644
index 0000000..0741484
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/utils/GenerateNumToolTest.java
@@ -0,0 +1,27 @@
+package com.guo.learningprogresstracker.utils;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class GenerateNumToolTest {
+
+    @Test
+    void generateNum_defaultSeparator_prefixDateSequence() {
+        String today = LocalDate.now().format(DateTimeFormatter.BASIC_ISO_DATE);
+        String code = GenerateNumTool.generateNum("ORD");
+        assertTrue(code.startsWith("ORD-" + today + "-"), "实际值: " + code);
+        // 序列为毫秒时间戳对 1_000_000 取模，最多 6 位数字
+        assertTrue(code.matches("ORD-" + today + "-\\d{1,6}"), "实际值: " + code);
+    }
+
+    @Test
+    void generateNum_customSeparator_prefixDateSequence() {
+        String today = LocalDate.now().format(DateTimeFormatter.BASIC_ISO_DATE);
+        String code = GenerateNumTool.generateNum("BIZ", "_");
+        assertTrue(code.matches("BIZ_" + today + "_\\d{1,6}"), "实际值: " + code);
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/utils/MindMapNodeTest.java b/src/test/java/com/guo/learningprogresstracker/utils/MindMapNodeTest.java
new file mode 100644
index 0000000..9f6b5f3
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/utils/MindMapNodeTest.java
@@ -0,0 +1,155 @@
+package com.guo.learningprogresstracker.utils;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class MindMapNodeTest {
+
+    @Test
+    void noArgConstructor_leavesFieldsNull() {
+        MindMapNode n = new MindMapNode();
+        assertNull(n.getTitle());
+        assertNull(n.getNotes());
+        assertNull(n.getSourceType());
+        assertNull(n.getSourceId());
+        assertNull(n.getChildren());
+    }
+
+    @Test
+    void titleConstructor_setsEmptyNotesAndMutableChildren() {
+        MindMapNode n = new MindMapNode("标题");
+        assertEquals("标题", n.getTitle());
+        assertEquals("", n.getNotes());
+        assertNotNull(n.getChildren());
+        assertTrue(n.getChildren().isEmpty());
+    }
+
+    @Test
+    void toMap_nullScalarsBecomeEmptyString_andOptionalKeysOmitted() {
+        Map<String, Object> map = new MindMapNode().toMap();
+        assertEquals("", map.get("title"));
+        assertEquals("", map.get("notes"));
+        assertFalse(map.containsKey("sourceType"));
+        assertFalse(map.containsKey("sourceId"));
+        assertEquals(List.of(), map.get("children"));
+    }
+
+    @Test
+    @SuppressWarnings("unchecked")
+    void toMap_withScalarsAndNestedChildren() {
+        MindMapNode n = new MindMapNode("父");
+        n.setNotes("备注");
+        n.setSourceType("REPORT");
+        n.setSourceId(9);
+        n.setChildren(new ArrayList<>(List.of(new MindMapNode("子"))));
+
+        Map<String, Object> map = n.toMap();
+        assertEquals("父", map.get("title"));
+        assertEquals("备注", map.get("notes"));
+        assertEquals("REPORT", map.get("sourceType"));
+        assertEquals(Integer.valueOf(9), map.get("sourceId"));
+
+        List<Map<String, Object>> children = (List<Map<String, Object>>) map.get("children");
+        assertEquals(1, children.size());
+        assertEquals("子", children.get(0).get("title"));
+    }
+
+    @Test
+    void fromMap_supportsBothChildrenAndNodesKeys() {
+        Map<String, Object> viaChildren = Map.of(
+                "title", "父",
+                "children", List.of(Map.of("title", "子1")));
+        MindMapNode a = MindMapNode.fromMap(viaChildren);
+        assertEquals("父", a.getTitle());
+        assertEquals("子1", a.getChildren().get(0).getTitle());
+
+        Map<String, Object> viaNodes = Map.of(
+                "title", "父",
+                "nodes", List.of(Map.of("title", "子2")));
+        MindMapNode b = MindMapNode.fromMap(viaNodes);
+        assertEquals("子2", b.getChildren().get(0).getTitle());
+    }
+
+    @Test
+    void fromMap_convertsNumericSourceId_andDefaults() {
+        Map<String, Object> map = new HashMap<>();
+        map.put("title", "t");
+        map.put("notes", "笔记");
+        map.put("sourceType", "TASK");
+        map.put("sourceId", 42L); // Number 统一转 Integer
+
+        MindMapNode n = MindMapNode.fromMap(map);
+        assertEquals("t", n.getTitle());
+        assertEquals("笔记", n.getNotes());
+        assertEquals("TASK", n.getSourceType());
+        assertEquals(Integer.valueOf(42), n.getSourceId());
+        assertTrue(n.getChildren().isEmpty()); // 无 children/nodes key
+
+        map.put("sourceId", null); // 显式 null 不写入
+        assertNull(MindMapNode.fromMap(map).getSourceId());
+    }
+
+    @Test
+    void fromMap_skipsNonMapEntriesInChildList() {
+        Map<String, Object> map = Map.of(
+                "title", "父",
+                "children", List.of("文本", Map.of("title", "有效"), 42));
+        MindMapNode n = MindMapNode.fromMap(map);
+        assertEquals(1, n.getChildren().size());
+        assertEquals("有效", n.getChildren().get(0).getTitle());
+    }
+
+    @Test
+    void toMapFromMapRoundTrip_keepsFields() {
+        MindMapNode child = new MindMapNode("子");
+        child.setNotes("cn");
+        MindMapNode root = new MindMapNode("根");
+        root.setNotes("rn");
+        root.setSourceType("REPORT");
+        root.setSourceId(3);
+        root.setChildren(new ArrayList<>(List.of(child)));
+
+        MindMapNode rebuilt = MindMapNode.fromMap(root.toMap());
+        assertEquals("根", rebuilt.getTitle());
+        assertEquals("rn", rebuilt.getNotes());
+        assertEquals("REPORT", rebuilt.getSourceType());
+        assertEquals(Integer.valueOf(3), rebuilt.getSourceId());
+        assertEquals("子", rebuilt.getChildren().get(0).getTitle());
+        assertEquals("cn", rebuilt.getChildren().get(0).getNotes());
+    }
+
+    @Test
+    void fromJson_parsesValidJson_andFallsBackOnInvalid() {
+        MindMapNode ok = MindMapNode.fromJson(
+                "{\"title\":\"根\",\"notes\":\"n\",\"children\":[{\"title\":\"子\"}]}",
+                new ObjectMapper());
+        assertEquals("根", ok.getTitle());
+        assertEquals("n", ok.getNotes());
+        assertEquals("子", ok.getChildren().get(0).getTitle());
+
+        assertEquals("解析失败", MindMapNode.fromJson("not json", new ObjectMapper()).getTitle());
+        assertEquals("解析失败", MindMapNode.fromJson(null, new ObjectMapper()).getTitle());
+    }
+
+    @Test
+    void chainedSetters_returnSameInstance() {
+        MindMapNode n = new MindMapNode();
+        assertSame(n, n.setTitle("t"));
+        assertSame(n, n.setNotes("n"));
+        assertSame(n, n.setSourceType("s"));
+        assertSame(n, n.setSourceId(1));
+        assertSame(n, n.setChildren(new ArrayList<>()));
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/utils/MindMapTreeToolTest.java b/src/test/java/com/guo/learningprogresstracker/utils/MindMapTreeToolTest.java
new file mode 100644
index 0000000..0465ebd
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/utils/MindMapTreeToolTest.java
@@ -0,0 +1,370 @@
+package com.guo.learningprogresstracker.utils;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.Constructor;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+class MindMapTreeToolTest {
+
+    /** 构建带可变 children 列表的节点 */
+    private static MindMapNode node(String title, MindMapNode... children) {
+        MindMapNode n = new MindMapNode(title);
+        List<MindMapNode> list = new ArrayList<>();
+        Collections.addAll(list, children);
+        n.setChildren(list);
+        return n;
+    }
+
+    private static List<String> titles(List<MindMapNode> nodes) {
+        return nodes.stream().map(MindMapNode::getTitle).toList();
+    }
+
+    // ============ 私有构造器 ============
+
+    @Test
+    void privateConstructor_onlyForUtilityUsage() throws Exception {
+        Constructor<MindMapTreeTool> ctor = MindMapTreeTool.class.getDeclaredConstructor();
+        ctor.setAccessible(true);
+        assertNotNull(ctor.newInstance());
+    }
+
+    // ============ parseOutline ============
+
+    @Test
+    void parseOutline_nullBlankOrWhitespaceOnly_returnsUnnamed() {
+        assertEquals("未命名", MindMapTreeTool.parseOutline(null).getTitle());
+        assertEquals("未命名", MindMapTreeTool.parseOutline("").getTitle());
+        assertEquals("未命名", MindMapTreeTool.parseOutline("   \n\t ").getTitle());
+        // 全部是空白行时过滤后为空，同样返回"未命名"
+        assertEquals("未命名", MindMapTreeTool.parseOutline("  \n\t\t\n").getTitle());
+    }
+
+    @Test
+    void parseOutline_indentAndMarkers_buildHierarchyWithBacktracking() {
+        String outline = String.join("\n",
+                "项目导图",
+                "- 分支A",
+                "  * 子A1",
+                "    + 孙A1a",
+                "- 分支B",
+                "1. 分支C",
+                "* 1. 组合标记");
+
+        MindMapNode root = MindMapTreeTool.parseOutline(outline);
+        assertEquals("项目导图", root.getTitle());
+        assertEquals(List.of("分支A", "分支B", "分支C", "组合标记"), titles(root.getChildren()));
+        assertEquals(List.of("子A1"), titles(root.getChildren().get(0).getChildren()));
+        assertEquals(List.of("孙A1a"), titles(root.getChildren().get(0).getChildren().get(0).getChildren()));
+        // 深层节点被解析时均被显式挂上 children 列表
+        assertNotNull(root.getChildren().get(0).getChildren().get(0).getChildren());
+    }
+
+    @Test
+    void parseOutline_tabIndent_levels() {
+        String outline = String.join("\n",
+                "根",
+                "\t一级A",
+                "\t\t二级A1",
+                "\t一级B");
+        MindMapNode root = MindMapTreeTool.parseOutline(outline);
+        assertEquals(List.of("一级A", "一级B"), titles(root.getChildren()));
+        assertEquals(List.of("二级A1"), titles(root.getChildren().get(0).getChildren()));
+    }
+
+    @Test
+    void parseOutline_hashLevels_andPopBack() {
+        String outline = String.join("\n",
+                "根",
+                "# 一级",
+                "## 二级",
+                "### 三级",
+                "## 二级B");
+        MindMapNode root = MindMapTreeTool.parseOutline(outline);
+        // 实际弹栈语义：## 二级B 出栈到 level<2 时父级是一级
+        assertEquals(List.of("一级"), titles(root.getChildren()));
+        assertEquals(List.of("二级", "二级B"), titles(root.getChildren().get(0).getChildren()));
+        assertEquals(List.of("三级"), titles(root.getChildren().get(0).getChildren().get(0).getChildren()));
+    }
+
+    @Test
+    void parseOutline_stripsTrailingWhitespace_andRootStrip() {
+        String outline = "  根标题  \r\n  - 节点A \t \r\n";
+        MindMapNode root = MindMapTreeTool.parseOutline(outline);
+        assertEquals("根标题", root.getTitle());
+        assertEquals(List.of("节点A"), titles(root.getChildren()));
+    }
+
+    // ============ toOutline / toFullOutline ============
+
+    @Test
+    void toOutline_singleLevelChildren() {
+        MindMapNode root = node("Root", node("A"), node("B"));
+        assertEquals("  - A\n  - B\n", MindMapTreeTool.toOutline(root));
+    }
+
+    @Test
+    void toOutline_nullTitleAndNoChildren() {
+        MindMapNode leaf = new MindMapNode(); // children 为 null
+        assertEquals("", MindMapTreeTool.toOutline(leaf));
+
+        MindMapNode root = new MindMapNode();
+        root.setChildren(new ArrayList<>(List.of(new MindMapNode())));
+        assertEquals("  - \n", MindMapTreeTool.toOutline(root));
+    }
+
+    @Test
+    void toOutline_multiLevel_documentsCurrentDuplicationBehavior() {
+        // 现状记录（生产缺陷，见测试报告）：level 0 的二次遍历会把孙子层重复输出一次
+        MindMapNode root = node("Root", node("A", node("A1")));
+        assertEquals("  - A\n    - A1\n  - A1\n", MindMapTreeTool.toOutline(root));
+    }
+
+    @Test
+    void toFullOutline_rootTitleThenIndentedChildren() {
+        MindMapNode root = node("Root", node("A", node("A1")), node("B"));
+        assertEquals("Root\n  - A\n    - A1\n  - B\n", MindMapTreeTool.toFullOutline(root));
+    }
+
+    @Test
+    void toFullOutline_nullTitleRoot() {
+        assertEquals("\n", MindMapTreeTool.toFullOutline(new MindMapNode()));
+    }
+
+    // ============ flatten / countNodes / maxDepth ============
+
+    @Test
+    void flatten_countNodes_maxDepth() {
+        MindMapNode leaf = new MindMapNode();
+        leaf.setChildren(null);                    // 叶子：children 为 null
+        MindMapNode empty = new MindMapNode("e");  // children 为空列表
+
+        MindMapNode root = node("r", node("a", node("a1")), node("b"));
+
+        assertEquals(1, MindMapTreeTool.maxDepth(leaf));
+        assertEquals(1, MindMapTreeTool.maxDepth(empty));
+        assertEquals(3, MindMapTreeTool.maxDepth(root));
+
+        assertEquals(List.of("r", "a", "a1", "b"), titles(MindMapTreeTool.flatten(root)));
+        assertEquals(4, MindMapTreeTool.countNodes(root));
+        assertEquals(1, MindMapTreeTool.countNodes(leaf));
+    }
+
+    // ============ extractSubtree ============
+
+    @Test
+    void extractSubtree_byFullPath_returnsDeepCopy() {
+        MindMapNode a1 = node("A1");
+        a1.setNotes("笔记");
+        a1.setSourceType("REPORT");
+        a1.setSourceId(7);
+        a1.setChildren(new ArrayList<>(List.of(node("A1子"))));
+        MindMapNode root = node("Root", node("A", a1, node("A2")), node("B"));
+
+        MindMapNode sub = MindMapTreeTool.extractSubtree(root, "Root / A / A1");
+        assertNotNull(sub);
+        assertEquals("A1", sub.getTitle());
+        assertEquals("笔记", sub.getNotes());
+        assertEquals("REPORT", sub.getSourceType());
+        assertEquals(Integer.valueOf(7), sub.getSourceId());
+        assertEquals(List.of("A1子"), titles(sub.getChildren()));
+        assertNotSame(a1, sub);
+        assertNotSame(a1.getChildren().get(0), sub.getChildren().get(0));
+        // 修改副本不影响原树
+        sub.getChildren().clear();
+        assertEquals(1, a1.getChildren().size());
+    }
+
+    @Test
+    void extractSubtree_withoutRootSegment_andNormalizedMatching() {
+        MindMapNode root = node("复习计划", node("Java 核心（进阶）", node("并发编程")));
+
+        // 大小写与标点差异通过 normalizeForMerge 匹配
+        MindMapNode sub = MindMapTreeTool.extractSubtree(root, "java核心进阶 / 并发编程");
+        assertNotNull(sub);
+        assertEquals("并发编程", sub.getTitle());
+
+        // 不含根标题：第一段直接在根 children 中查找
+        MindMapNode sub2 = MindMapTreeTool.extractSubtree(root, "Java 核心（进阶）");
+        assertNotNull(sub2);
+        assertEquals("Java 核心（进阶）", sub2.getTitle());
+
+        // 空路径段被跳过
+        MindMapNode sub3 = MindMapTreeTool.extractSubtree(root, "复习计划 // Java 核心（进阶）");
+        assertNotNull(sub3);
+        assertEquals("Java 核心（进阶）", sub3.getTitle());
+    }
+
+    @Test
+    void extractSubtree_nullOrMismatchedPathReturnsNull() {
+        MindMapNode root = node("Root", node("A", node("A1")), new MindMapNode());
+        assertNull(MindMapTreeTool.extractSubtree(null, "Root"));
+        assertNull(MindMapTreeTool.extractSubtree(root, null));
+        assertNull(MindMapTreeTool.extractSubtree(root, "   "));
+        assertNull(MindMapTreeTool.extractSubtree(root, "Root / X"));           // 中途失配
+        assertNull(MindMapTreeTool.extractSubtree(root, "Root / A / A1 / 更深")); // 末端失配
+    }
+
+    // ============ findClosestNode ============
+
+    @Test
+    void findClosestNode_titleMatch() {
+        MindMapNode root = node("Root", node("Java 并发"), node("完全无关"));
+        MindMapNode best = MindMapTreeTool.findClosestNode(root, "java并发");
+        assertNotNull(best);
+        assertEquals("Java 并发", best.getTitle());
+    }
+
+    @Test
+    void findClosestNode_notesCountWithHalfWeight() {
+        MindMapNode hit = node("完全无关");
+        hit.setNotes("数据库索引优化详解");
+        MindMapNode root = node("Root", hit, node("另一个"));
+
+        MindMapNode best = MindMapTreeTool.findClosestNode(root, "数据库索引优化");
+        assertNotNull(best);
+        assertEquals("完全无关", best.getTitle());
+    }
+
+    @Test
+    void findClosestNode_lowScoresOrInvalidInputsReturnNull() {
+        MindMapNode root = node("Root", new MindMapNode(), node("   "), node("abcd"));
+        assertNull(MindMapTreeTool.findClosestNode(root, "zzzz"));  // 全部低于阈值
+        assertNull(MindMapTreeTool.findClosestNode(null, "x"));
+        assertNull(MindMapTreeTool.findClosestNode(root, null));
+        assertNull(MindMapTreeTool.findClosestNode(root, "  "));
+    }
+
+    // ============ getPath ============
+
+    @Test
+    void getPath_hitAndMissAndNulls() {
+        MindMapNode root = node("Root", node("A"), node("B", node("C")));
+        assertEquals("Root / B / C", MindMapTreeTool.getPath(root, "C"));
+        assertEquals("Root", MindMapTreeTool.getPath(root, "ROOT")); // normalize 后命中根
+        assertEquals("", MindMapTreeTool.getPath(root, "不存在"));
+        assertEquals("", MindMapTreeTool.getPath(null, "x"));
+        assertEquals("", MindMapTreeTool.getPath(root, null));
+    }
+
+    @Test
+    void getPath_handlesNullTitlesAlongPath() {
+        MindMapNode root = node("Root", new MindMapNode());
+        assertEquals("Root", MindMapTreeTool.getPath(root, "Root"));
+        assertEquals("", MindMapTreeTool.getPath(root, "不在树中"));
+    }
+
+    // ============ similarityScore ============
+
+    @Test
+    void similarityScore_variousCases() {
+        assertEquals(1.0, MindMapTreeTool.similarityScore("Java 并发", "java并发"), 1e-9);
+        assertEquals(0.9, MindMapTreeTool.similarityScore("java concurrency guide", "concurrency"), 1e-9);
+        // bigram Jaccard：{ab,bc,cd} 与 {ab,bc,ce} 交 2 / 并 4
+        assertEquals(0.5, MindMapTreeTool.similarityScore("abcd", "abce"), 1e-9);
+        assertEquals(0.0, MindMapTreeTool.similarityScore("", "x"), 1e-9);
+        assertEquals(0.0, MindMapTreeTool.similarityScore(null, "x"), 1e-9);
+        assertEquals(0.0, MindMapTreeTool.similarityScore("x", null), 1e-9);
+        assertEquals(0.0, MindMapTreeTool.similarityScore("a", "b"), 1e-9);   // 双方 bigram 均为空
+        assertEquals(0.9, MindMapTreeTool.similarityScore("a", "ab"), 1e-9);  // 子串匹配优先于 bigram
+    }
+
+    // ============ mergeTrees ============
+
+    @Test
+    void mergeTrees_nullSideReturnsOther() {
+        MindMapNode oldTree = node("旧");
+        MindMapNode newTree = node("新");
+        assertSame(newTree, MindMapTreeTool.mergeTrees(null, newTree));
+        assertSame(oldTree, MindMapTreeTool.mergeTrees(oldTree, null));
+    }
+
+    @Test
+    void mergeTrees_keepsOldTitlesAndAppendsOldOnlyNodes() {
+        MindMapNode oldChild = node("任务，一");
+        oldChild.setNotes("旧备注");
+        oldChild.setChildren(new ArrayList<>(List.of(node("旧子"))));
+        MindMapNode oldTree = node("根", oldChild, node("旧独有"));
+
+        MindMapNode newChild = node("任务一。");
+        newChild.setChildren(new ArrayList<>(List.of(node("新子"))));
+        MindMapNode newTree = node("新根", newChild, node("新增"));
+
+        MindMapNode merged = MindMapTreeTool.mergeTrees(oldTree, newTree);
+
+        assertEquals("根", merged.getTitle()); // 保留旧树根标题
+        assertEquals(List.of("任务，一", "新增", "旧独有"), titles(merged.getChildren()));
+
+        MindMapNode kept = merged.getChildren().get(0);
+        assertEquals("旧备注", kept.getNotes());
+        assertEquals(List.of("新子", "旧子"), titles(kept.getChildren()));
+
+        assertNotSame(oldChild, kept);
+        assertSame(newTree.getChildren().get(1), merged.getChildren().get(1)); // 新节点直接复用
+        assertSame(oldTree.getChildren().get(1), merged.getChildren().get(2)); // 旧独有节点直接复用
+    }
+
+    @Test
+    void mergeTrees_nullChildrenLists() {
+        // 旧 children 为 null：新 children 全部保留
+        MindMapNode oldNoKids = new MindMapNode();
+        oldNoKids.setChildren(null);
+        MindMapNode newWithKids = node("新", node("k1"));
+        MindMapNode merged = MindMapTreeTool.mergeTrees(oldNoKids, newWithKids);
+        assertNull(merged.getTitle());
+        assertEquals(List.of("k1"), titles(merged.getChildren()));
+
+        // 新 children 为 null：旧 children 原样保留
+        MindMapNode oldWithKids = node("旧", node("k2"));
+        MindMapNode newNoKids = new MindMapNode("新2");
+        newNoKids.setChildren(null);
+        MindMapNode merged2 = MindMapTreeTool.mergeTrees(oldWithKids, newNoKids);
+        assertEquals(List.of("k2"), titles(merged2.getChildren()));
+        assertSame(oldWithKids.getChildren().get(0), merged2.getChildren().get(0));
+    }
+
+    // ============ toJson / fromJson ============
+
+    @Test
+    void toJson_serializesNodeMapJson() {
+        MindMapNode n = node("根", node("子"));
+        n.setNotes("备注");
+        String json = MindMapTreeTool.toJson(n, new ObjectMapper());
+        assertTrue(json.contains("\"title\":\"根\""));
+        assertTrue(json.contains("\"notes\":\"备注\""));
+        assertTrue(json.contains("\"title\":\"子\""));
+        assertTrue(json.contains("\"children\":[]"));
+    }
+
+    @Test
+    void toJson_serializationFailureReturnsFallback() throws Exception {
+        ObjectMapper failing = mock(ObjectMapper.class);
+        when(failing.writeValueAsString(any())).thenThrow(new RuntimeException("boom"));
+        assertEquals("{\"title\":\"序列化失败\"}", MindMapTreeTool.toJson(node("x"), failing));
+    }
+
+    @Test
+    void fromJson_parsesValidJson_andFallsBackOnInvalid() {
+        MindMapNode ok = MindMapTreeTool.fromJson(
+                "{\"title\":\"根\",\"children\":[{\"title\":\"子\",\"nodes\":[]}]}",
+                new ObjectMapper());
+        assertEquals("根", ok.getTitle());
+        assertEquals("子", ok.getChildren().get(0).getTitle());
+
+        assertEquals("解析失败", MindMapTreeTool.fromJson("not json", new ObjectMapper()).getTitle());
+        assertEquals("解析失败", MindMapTreeTool.fromJson(null, new ObjectMapper()).getTitle());
+    }
+}
diff --git a/src/test/java/com/guo/learningprogresstracker/utils/TitleFetcherTest.java b/src/test/java/com/guo/learningprogresstracker/utils/TitleFetcherTest.java
new file mode 100644
index 0000000..3844136
--- /dev/null
+++ b/src/test/java/com/guo/learningprogresstracker/utils/TitleFetcherTest.java
@@ -0,0 +1,291 @@
+package com.guo.learningprogresstracker.utils;
+
+import com.guo.learningprogresstracker.support.TestHttpServer;
+import com.guo.learningprogresstracker.support.TestHttpsServer;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import javax.net.ssl.X509TrustManager;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.security.cert.X509Certificate;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class TitleFetcherTest {
+
+    // ============ HTTP 组：基于本地 TestHttpServer ============
+    @Nested
+    class HttpGroup extends TestHttpServer {
+
+        @Test
+        void fetchTitle_basicHtml_withQueryAndPrefixRoute() {
+            route("GET", "/basic", 200, "<html><head><title>基础标题</title></head></html>");
+            assertEquals("基础标题", TitleFetcher.fetchTitle(baseUrl() + "/basic?src=unit"));
+            assertEquals("src=unit", lastQuery("GET", "/basic"));
+        }
+
+        @Test
+        void fetchTitle_decodesHtmlEntities_andCollapsesWhitespace() {
+            route("GET", "/entities", 200,
+                    "<html><title>A&amp;B &lt;tag&gt; &quot;引&quot; &#39;x&#39; A&nbsp;&nbsp;B   多   空格</title></html>");
+            assertEquals("A&B <tag> \"引\" 'x' A B 多 空格",
+                    TitleFetcher.fetchTitle(baseUrl() + "/entities"));
+        }
+
+        @Test
+        void fetchTitle_whitespaceOnlyTitleReturnsNull() {
+            route("GET", "/emptytitle", 200, "<html><title>&nbsp;</title></html>");
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/emptytitle"));
+        }
+
+        @Test
+        void fetchTitle_gzipResponseBody() {
+            route("GET", "/gz", 200, "<html><title>压缩标题</title></html>",
+                    Map.of("Content-Encoding-Test", "gzip"));
+            assertEquals("压缩标题", TitleFetcher.fetchTitle(baseUrl() + "/gz"));
+        }
+
+        @Test
+        void fetchTitle_gzipHeaderButRawBody_fallsBackAndReturnsNull() {
+            // 声明 gzip 但响应体未压缩：GZIPInputStream 构造抛异常 → 走 catch 回退读原始流
+            route("GET", "/badgz", 200, "<html><body>not gzip</body></html>",
+                    Map.of("Content-Encoding", "gzip"));
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/badgz"));
+        }
+
+        @Test
+        void fetchTitle_deflateHeaderWithRawBody_returnsNull() {
+            // InflaterInputStream 包装成功但读取原始字节时抛错 → doFetch 捕获返回 null
+            route("GET", "/deflate", 200, "<html><body>not deflate</body></html>",
+                    Map.of("Content-Encoding", "deflate"));
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/deflate"));
+        }
+
+        @Test
+        void fetchTitle_gbkCharsetDecoding() {
+            String rawTitle = "中文标题";
+            route("GET", "/gbk", 200,
+                    "<html><title>" + rawTitle + "</title></html>",
+                    Map.of("Content-Type", "text/html; charset=GBK"));
+            // 服务端实际发送 UTF-8 字节，客户端按 GBK 解码：两者结果必然不同
+            String expected = new String(rawTitle.getBytes(StandardCharsets.UTF_8), Charset.forName("GBK"));
+            assertFalse(expected.isBlank());
+            String got = TitleFetcher.fetchTitle(baseUrl() + "/gbk");
+            assertNotEquals(rawTitle, got);
+            assertEquals(expected, got);
+        }
+
+        @Test
+        void fetchTitle_unknownCharsetFallsBackToUtf8() {
+            route("GET", "/badcharset", 200, "<html><title>Ascii 标题</title></html>",
+                    Map.of("Content-Type", "text/html; charset=NOT-A-REAL-CHARSET"));
+            assertEquals("Ascii 标题", TitleFetcher.fetchTitle(baseUrl() + "/badcharset"));
+        }
+
+        @Test
+        void fetchTitle_textHtmlWithoutCharsetDefaultsToUtf8() {
+            route("GET", "/nocharset", 200, "<html><title>无charset</title></html>",
+                    Map.of("Content-Type", "text/html"));
+            assertEquals("无charset", TitleFetcher.fetchTitle(baseUrl() + "/nocharset"));
+        }
+
+        @Test
+        void fetchTitle_nonTextContentTypeReturnsNull() {
+            route("GET", "/pdf", 200, "%PDF-1.4 not html",
+                    Map.of("Content-Type", "application/pdf"));
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/pdf"));
+        }
+
+        @Test
+        void fetchTitle_textPlainWithoutTitleReturnsNull() {
+            route("GET", "/txt", 200, "纯文本没有标题",
+                    Map.of("Content-Type", "text/plain; charset=utf-8"));
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/txt"));
+        }
+
+        @Test
+        void fetchTitle_xhtmlAccepted() {
+            route("GET", "/xhtml", 200, "<html><title>XHTML 标题</title></html>",
+                    Map.of("Content-Type", "application/xhtml+xml; charset=utf-8"));
+            assertEquals("XHTML 标题", TitleFetcher.fetchTitle(baseUrl() + "/xhtml"));
+        }
+
+        @Test
+        void fetchTitle_errorStatusReturnsNull() {
+            route("GET", "/err", 500, "oops");
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/err"));
+        }
+
+        // ---- 重定向链 ----
+
+        @Test
+        void fetchTitle_followsRedirectWithRelativeLocation() {
+            route("GET", "/start", 200, "<html><body>没有标题的页面</body></html>");
+            route("HEAD", "/start", 302, "", Map.of("Location", "/final"));
+            route("GET", "/final", 200, "<html><title>最终标题</title></html>");
+            assertEquals("最终标题", TitleFetcher.fetchTitle(baseUrl() + "/start"));
+        }
+
+        @Test
+        void fetchTitle_followsAbsoluteRedirectLocation() {
+            route("GET", "/absc", 200, "<html><body>没有标题</body></html>");
+            route("HEAD", "/absc", 301, "", Map.of("Location", baseUrl() + "/absfinal"));
+            route("GET", "/absfinal", 200, "<html><title>绝对跳转</title></html>");
+            assertEquals("绝对跳转", TitleFetcher.fetchTitle(baseUrl() + "/absc"));
+        }
+
+        @Test
+        void fetchTitle_selfRedirectReturnsNull() {
+            route("GET", "/loop", 200, "<html><body>loop</body></html>");
+            route("HEAD", "/loop", 302, "", Map.of("Location", "/loop"));
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/loop"));
+        }
+
+        @Test
+        void fetchTitle_tooManyRedirectsReturnsNull() {
+            for (int i = 0; i <= 5; i++) {
+                route("GET", "/r" + i, 200, "<html><body>跳转" + i + "</body></html>");
+                route("HEAD", "/r" + i, 302, "", Map.of("Location", "/r" + (i + 1)));
+            }
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/r0"));
+        }
+
+        @Test
+        void fetchTitle_headWithoutRedirectStatusReturnsNull() {
+            route("GET", "/stay", 200, "<html><body>没有标题</body></html>");
+            route("HEAD", "/stay", 200, "");
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/stay"));
+        }
+
+        @Test
+        void fetchTitle_blankRedirectLocationReturnsNull() {
+            route("GET", "/blank", 200, "<html><body>没有标题</body></html>");
+            route("HEAD", "/blank", 302, "", Map.of("Location", " "));
+            assertNull(TitleFetcher.fetchTitle(baseUrl() + "/blank"));
+        }
+
+        // ---- 非法输入 / 连接失败 ----
+
+        @Test
+        void fetchTitle_invalidInputsReturnNull() {
+            assertNull(TitleFetcher.fetchTitle(null));
+            assertNull(TitleFetcher.fetchTitle(""));
+            assertNull(TitleFetcher.fetchTitle("   "));
+            assertNull(TitleFetcher.fetchTitle("ftp://example.com/file"));
+            assertNull(TitleFetcher.fetchTitle("example.com/page"));
+        }
+
+        @Test
+        void fetchTitle_connectionRefusedReturnsNull() {
+            assertNull(TitleFetcher.fetchTitle("http://localhost:1/"));
+        }
+
+        // ---- embedTitles ----
+
+        @Test
+        void embedTitles_nullBlankOrLinkOnly_returnsAsIs() {
+            assertNull(TitleFetcher.embedTitles(null));
+            assertEquals("   ", TitleFetcher.embedTitles("   "));
+            String linkOnly = "已有 [手册](" + baseUrl() + "/keep) 说明";
+            assertEquals(linkOnly, TitleFetcher.embedTitles(linkOnly));
+        }
+
+        @Test
+        void embedTitles_replacesBareUrl_andStripsTrailingPunctuation() {
+            route("GET", "/doc", 200, "<html><title>接口文档</title></html>");
+            String url = baseUrl() + "/doc";
+            assertEquals("参见 [接口文档](" + url + ")。", TitleFetcher.embedTitles("参见 " + url + "。"));
+        }
+
+        @Test
+        void embedTitles_protectsExistingMarkdownLinks_thenRestores() {
+            route("GET", "/fresh", 200, "<html><title>新标题</title></html>");
+            String out = TitleFetcher.embedTitles(
+                    "看 [手册](" + baseUrl() + "/keep) 与 " + baseUrl() + "/fresh");
+            assertEquals("看 [手册](" + baseUrl() + "/keep) 与 [新标题](" + baseUrl() + "/fresh)", out);
+        }
+
+        @Test
+        void embedTitles_deduplicatesUrls() {
+            route("GET", "/dup", 200, "<html><title>重复标题</title></html>");
+            String url = baseUrl() + "/dup";
+            assertEquals("[重复标题](" + url + ") 和 [重复标题](" + url + ")",
+                    TitleFetcher.embedTitles(url + " 和 " + url));
+        }
+
+        @Test
+        void embedTitles_failedFetchKeepsBareUrl() {
+            String text = "文档在 http://localhost:1/missing 页面";
+            assertEquals(text, TitleFetcher.embedTitles(text));
+        }
+
+        @Test
+        void embedTitles_multipleUrlsAllReplaced() {
+            route("GET", "/a", 200, "<html><title>甲</title></html>");
+            route("GET", "/b", 200, "<html><title>乙</title></html>");
+            String out = TitleFetcher.embedTitles(baseUrl() + "/a 中间 " + baseUrl() + "/b");
+            assertEquals("[甲](" + baseUrl() + "/a) 中间 [乙](" + baseUrl() + "/b)", out);
+        }
+    }
+
+    // ============ HTTPS 组：自签名证书触发信任所有证书路径 ============
+    @Nested
+    class HttpsGroup extends TestHttpsServer {
+
+        @Test
+        void fetchTitle_selfSignedCertificateTrusted() {
+            html("/secure", "加密标题");
+            assertEquals("加密标题", TitleFetcher.fetchTitle(baseUrl() + "/secure"));
+        }
+    }
+
+    // ============ 静态块与内部 TrustManager ============
+
+    @Test
+    void trustAllManager_isInstalledAndAcceptsEverything() throws Exception {
+        // 静态块应成功安装宽松 SSL（sslRelaxed = true 分支）
+        Field relaxed = TitleFetcher.class.getDeclaredField("sslRelaxed");
+        relaxed.setAccessible(true);
+        assertTrue(relaxed.getBoolean(null), "静态块应成功安装信任所有证书的 SSLContext");
+
+        // 握手之外直接调用三个回调，确保内部类全部行被执行
+        X509TrustManager tm = newTrustAllManagerInstance();
+        assertArrayEquals(new X509Certificate[0], tm.getAcceptedIssuers());
+        assertDoesNotThrow(() -> tm.checkClientTrusted(null, "RSA"));
+        assertDoesNotThrow(() -> tm.checkServerTrusted(null, "RSA"));
+    }
+
+    private static X509TrustManager newTrustAllManagerInstance() throws Exception {
+        try {
+            for (Class<?> c : TitleFetcher.class.getDeclaredClasses()) {
+                if (X509TrustManager.class.isAssignableFrom(c)) {
+                    return (X509TrustManager) newInstanceAllowingAll(c);
+                }
+            }
+        } catch (Throwable ignored) {
+            // 个别实现不通过 getDeclaredClasses 暴露匿名类，退回按名称查找
+        }
+        Class<?> anon = Class.forName(TitleFetcher.class.getName() + "$1");
+        assertTrue(X509TrustManager.class.isAssignableFrom(anon), "TitleFetcher$1 应为 X509TrustManager");
+        return (X509TrustManager) newInstanceAllowingAll(anon);
+    }
+
+    private static Object newInstanceAllowingAll(Class<?> type) throws Exception {
+        for (Constructor<?> ctor : type.getDeclaredConstructors()) {
+            ctor.setAccessible(true);
+            return ctor.newInstance(new Object[ctor.getParameterCount()]);
+        }
+        throw new IllegalStateException("无可访问构造器: " + type.getName());
+    }
+}
diff --git a/src/test/resources/test-keystore.p12 b/src/test/resources/test-keystore.p12
new file mode 100644
index 0000000..2c9f6e9
Binary files /dev/null and b/src/test/resources/test-keystore.p12 differ