test：添加用户认证系统测试

- 添加登录核心服务单元测试
- 添加登录业务服务单元测试
- 添加端到端集成测试
- 覆盖所有认证流程和错误场景

test/business/login.e2e-spec.ts

@@ -0,0 +1,182 @@
+/**
+ * 登录功能端到端测试
+ */
+
+import { Test, TestingModule } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import * as request from 'supertest';
+import { AppModule } from '../../src/app.module';
+
+describe('Login (e2e)', () => {
+  let app: INestApplication;
+
+  beforeEach(async () => {
+    const moduleFixture: TestingModule = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  afterEach(async () => {
+    await app.close();
+  });
+
+  describe('/auth/register (POST)', () => {
+    it('should register a new user', () => {
+      return request(app.getHttpServer())
+        .post('/auth/register')
+        .send({
+          username: 'testuser' + Date.now(),
+          password: 'password123',
+          nickname: '测试用户',
+          email: `test${Date.now()}@example.com`
+        })
+        .expect(201)
+        .expect((res) => {
+          expect(res.body.success).toBe(true);
+          expect(res.body.data.user.username).toBeDefined();
+          expect(res.body.data.access_token).toBeDefined();
+        });
+    });
+
+    it('should return error for invalid password', () => {
+      return request(app.getHttpServer())
+        .post('/auth/register')
+        .send({
+          username: 'testuser',
+          password: '123', // 密码太短
+          nickname: '测试用户'
+        })
+        .expect(400);
+    });
+  });
+
+  describe('/auth/login (POST)', () => {
+    it('should login with valid credentials', async () => {
+      // 先注册用户
+      const username = 'logintest' + Date.now();
+      await request(app.getHttpServer())
+        .post('/auth/register')
+        .send({
+          username,
+          password: 'password123',
+          nickname: '登录测试用户'
+        });
+
+      // 然后登录
+      return request(app.getHttpServer())
+        .post('/auth/login')
+        .send({
+          identifier: username,
+          password: 'password123'
+        })
+        .expect(200)
+        .expect((res) => {
+          expect(res.body.success).toBe(true);
+          expect(res.body.data.user.username).toBe(username);
+          expect(res.body.data.access_token).toBeDefined();
+        });
+    });
+
+    it('should return error for invalid credentials', () => {
+      return request(app.getHttpServer())
+        .post('/auth/login')
+        .send({
+          identifier: 'nonexistent',
+          password: 'wrongpassword'
+        })
+        .expect(200) // 业务层返回200，但success为false
+        .expect((res) => {
+          expect(res.body.success).toBe(false);
+          expect(res.body.error_code).toBe('LOGIN_FAILED');
+        });
+    });
+  });
+
+  describe('/auth/github (POST)', () => {
+    it('should handle GitHub OAuth login', () => {
+      return request(app.getHttpServer())
+        .post('/auth/github')
+        .send({
+          github_id: 'github' + Date.now(),
+          username: 'githubuser' + Date.now(),
+          nickname: 'GitHub用户',
+          email: `github${Date.now()}@example.com`,
+          avatar_url: 'https://avatars.githubusercontent.com/u/123456'
+        })
+        .expect(200)
+        .expect((res) => {
+          expect(res.body.success).toBe(true);
+          expect(res.body.data.user.username).toBeDefined();
+          expect(res.body.data.is_new_user).toBe(true);
+        });
+    });
+  });
+
+  describe('/auth/forgot-password (POST)', () => {
+    it('should send password reset code', async () => {
+      // 先注册用户
+      const email = `reset${Date.now()}@example.com`;
+      await request(app.getHttpServer())
+        .post('/auth/register')
+        .send({
+          username: 'resettest' + Date.now(),
+          password: 'password123',
+          nickname: '重置测试用户',
+          email
+        });
+
+      // 发送重置验证码
+      return request(app.getHttpServer())
+        .post('/auth/forgot-password')
+        .send({
+          identifier: email
+        })
+        .expect(200)
+        .expect((res) => {
+          expect(res.body.success).toBe(true);
+          expect(res.body.data.verification_code).toMatch(/^\d{6}$/);
+        });
+    });
+  });
+
+  describe('/auth/reset-password (POST)', () => {
+    it('should reset password with valid code', async () => {
+      // 先注册用户
+      const email = `resetpwd${Date.now()}@example.com`;
+      await request(app.getHttpServer())
+        .post('/auth/register')
+        .send({
+          username: 'resetpwdtest' + Date.now(),
+          password: 'password123',
+          nickname: '重置密码测试用户',
+          email
+        });
+
+      // 获取验证码
+      const codeResponse = await request(app.getHttpServer())
+        .post('/auth/forgot-password')
+        .send({
+          identifier: email
+        });
+
+      const verificationCode = codeResponse.body.data.verification_code;
+
+      // 重置密码
+      return request(app.getHttpServer())
+        .post('/auth/reset-password')
+        .send({
+          identifier: email,
+          verification_code: verificationCode,
+          new_password: 'newpassword123'
+        })
+        .expect(200)
+        .expect((res) => {
+          expect(res.body.success).toBe(true);
+          expect(res.body.message).toBe('密码重置成功');
+        });
+    });
+  });
+});