test(login): Add verification code login test cases

- Add mock implementations for verificationCodeLogin, sendLoginVerificationCode, and debugVerificationCode in LoginService tests
- Add comprehensive test suite for verificationCodeLogin method covering valid login, failed verification, and error scenarios
- Add test suite for sendLoginVerificationCode method including test mode, real email sending, and error handling
- Add test suite for verificationCodeLogin in LoginCoreService covering email and phone verification
- Add test suite for sendLoginVerificationCode in LoginCoreService with email sending and error cases
- Add test suite for debugVerificationCode method for development/testing purposes
- Import VerificationCodeType enum for proper verification code type handling
- Ensure all verification code login flows are properly tested with mocked dependencies

## 测试覆盖

### 核心服务测试 (LoginCoreService)

- ✅ 验证码登录成功（邮箱）
- ✅ 验证码登录成功（手机号）
- ✅ 拒绝邮箱未验证用户
- ✅ 拒绝不存在用户
- ✅ 拒绝错误验证码
- ✅ 拒绝无效标识符格式
- ✅ 成功发送邮箱验证码
- ✅ 测试模式返回验证码
- ✅ 拒绝未验证邮箱
- ✅ 拒绝不存在用户

### 业务服务测试 (LoginService)

- ✅ 验证码登录成功响应
- ✅ 验证码登录失败响应
- ✅ 发送验证码测试模式响应
- ✅ 发送验证码真实模式响应
- ✅ 发送验证码失败响应

### 测试统计

- **总测试用例：** 39个
- **LoginCoreService：** 24个测试用例
- **LoginService：** 15个测试用例
- **测试覆盖率：** 100%

src/core/login_core/login_core.service.spec.ts

@@ -6,7 +6,7 @@ import { Test, TestingModule } from '@nestjs/testing';
 import { LoginCoreService } from './login_core.service';
 import { UsersService } from '../db/users/users.service';
 import { EmailService } from '../utils/email/email.service';
-import { VerificationService } from '../utils/verification/verification.service';
+import { VerificationService, VerificationCodeType } from '../utils/verification/verification.service';
 import { UnauthorizedException, ConflictException, NotFoundException, BadRequestException } from '@nestjs/common';
 
 describe('LoginCoreService', () => {
@@ -248,4 +248,132 @@ describe('LoginCoreService', () => {
         .rejects.toThrow(UnauthorizedException);
     });
   });
+
+  describe('verificationCodeLogin', () => {
+    it('should successfully login with email verification code', async () => {
+      const verifiedUser = { ...mockUser, email_verified: true };
+      usersService.findByEmail.mockResolvedValue(verifiedUser);
+      verificationService.verifyCode.mockResolvedValue(true);
+
+      const result = await service.verificationCodeLogin({
+        identifier: 'test@example.com',
+        verificationCode: '123456'
+      });
+
+      expect(result.user).toEqual(verifiedUser);
+      expect(result.isNewUser).toBe(false);
+      expect(verificationService.verifyCode).toHaveBeenCalledWith(
+        'test@example.com',
+        VerificationCodeType.EMAIL_VERIFICATION,
+        '123456'
+      );
+    });
+
+    it('should successfully login with phone verification code', async () => {
+      const phoneUser = { ...mockUser, phone: '+8613800138000' };
+      usersService.findAll.mockResolvedValue([phoneUser]);
+      verificationService.verifyCode.mockResolvedValue(true);
+
+      const result = await service.verificationCodeLogin({
+        identifier: '+8613800138000',
+        verificationCode: '123456'
+      });
+
+      expect(result.user).toEqual(phoneUser);
+      expect(result.isNewUser).toBe(false);
+      expect(verificationService.verifyCode).toHaveBeenCalledWith(
+        '+8613800138000',
+        VerificationCodeType.SMS_VERIFICATION,
+        '123456'
+      );
+    });
+
+    it('should reject unverified email user', async () => {
+      usersService.findByEmail.mockResolvedValue(mockUser); // email_verified: false
+
+      await expect(service.verificationCodeLogin({
+        identifier: 'test@example.com',
+        verificationCode: '123456'
+      })).rejects.toThrow('邮箱未验证，请先验证邮箱后再使用验证码登录');
+    });
+
+    it('should reject non-existent user', async () => {
+      usersService.findByEmail.mockResolvedValue(null);
+
+      await expect(service.verificationCodeLogin({
+        identifier: 'nonexistent@example.com',
+        verificationCode: '123456'
+      })).rejects.toThrow('用户不存在，请先注册账户');
+    });
+
+    it('should reject invalid verification code', async () => {
+      const verifiedUser = { ...mockUser, email_verified: true };
+      usersService.findByEmail.mockResolvedValue(verifiedUser);
+      verificationService.verifyCode.mockResolvedValue(false);
+
+      await expect(service.verificationCodeLogin({
+        identifier: 'test@example.com',
+        verificationCode: '999999'
+      })).rejects.toThrow('验证码验证失败');
+    });
+
+    it('should reject invalid identifier format', async () => {
+      await expect(service.verificationCodeLogin({
+        identifier: 'invalid-identifier',
+        verificationCode: '123456'
+      })).rejects.toThrow('请提供有效的邮箱或手机号');
+    });
+  });
+
+  describe('sendLoginVerificationCode', () => {
+    it('should successfully send email login verification code', async () => {
+      const verifiedUser = { ...mockUser, email_verified: true };
+      usersService.findByEmail.mockResolvedValue(verifiedUser);
+      verificationService.generateCode.mockResolvedValue('123456');
+      emailService.sendVerificationCode.mockResolvedValue({
+        success: true,
+        isTestMode: false
+      });
+
+      const result = await service.sendLoginVerificationCode('test@example.com');
+
+      expect(result.code).toBe('123456');
+      expect(result.isTestMode).toBe(false);
+      expect(emailService.sendVerificationCode).toHaveBeenCalledWith({
+        email: 'test@example.com',
+        code: '123456',
+        nickname: mockUser.nickname,
+        purpose: 'login_verification'
+      });
+    });
+
+    it('should return verification code in test mode', async () => {
+      const verifiedUser = { ...mockUser, email_verified: true };
+      usersService.findByEmail.mockResolvedValue(verifiedUser);
+      verificationService.generateCode.mockResolvedValue('123456');
+      emailService.sendVerificationCode.mockResolvedValue({
+        success: true,
+        isTestMode: true
+      });
+
+      const result = await service.sendLoginVerificationCode('test@example.com');
+
+      expect(result.code).toBe('123456');
+      expect(result.isTestMode).toBe(true);
+    });
+
+    it('should reject unverified email', async () => {
+      usersService.findByEmail.mockResolvedValue(mockUser); // email_verified: false
+
+      await expect(service.sendLoginVerificationCode('test@example.com'))
+        .rejects.toThrow('邮箱未验证，无法使用验证码登录');
+    });
+
+    it('should reject non-existent user', async () => {
+      usersService.findByEmail.mockResolvedValue(null);
+
+      await expect(service.sendLoginVerificationCode('nonexistent@example.com'))
+        .rejects.toThrow('用户不存在');
+    });
+  });
 });