test: add vitest config and unit tests

src/__tests__/api/login.spec.ts

@@ -0,0 +1,35 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+vi.mock('@/utils/request', () => ({
+  default: {
+    post: vi.fn(),
+    get: vi.fn(),
+    put: vi.fn(),
+    delete: vi.fn(),
+  },
+}))
+
+import request from '@/utils/request'
+import { login, logout } from '@/api/login'
+
+const mockedRequest = vi.mocked(request)
+
+describe('login API', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('login sends POST to /login with credentials', async () => {
+    mockedRequest.post.mockResolvedValue({ code: 200, message: 'OK' })
+    const result = await login('admin', '123456')
+    expect(mockedRequest.post).toHaveBeenCalledWith('/login', { username: 'admin', password: '123456' })
+    expect(result).toEqual({ code: 200, message: 'OK' })
+  })
+
+  it('logout sends POST to /logout', async () => {
+    mockedRequest.post.mockResolvedValue({ code: 200, message: '已退出' })
+    const result = await logout()
+    expect(mockedRequest.post).toHaveBeenCalledWith('/logout')
+    expect(result).toEqual({ code: 200, message: '已退出' })
+  })
+})