const module: TestingModule = await Test.createTestingModule({
      controllers: [MyController],
      providers: [
        {
          provide: LoggerService,
          useValue: {
            assign: jest.fn(),
            log: jest.fn(),
          },
        },
        // We provide the pipe, but...
        GetUserPipe,
        // MISSING: REQUEST provider that GetUserPipe needs via @Inject(REQUEST)!
        // Without REQUEST, the pipe constructor gets 'undefined' for this.req
      ],
    }).compile();

@Controller('api')
export class MyController {
  constructor(private readonly logger: LoggerService) {}

  @Get('data')
  async getData(@User() user: UserDto): Promise<any> {
    // This line will show in the error, making it seem like the issue is here
    this.logger.assign({ userId: user.id, userName: user.name });
    
    return { message: `Hello user ${user.id}` };
  }
}

    TypeError: Cannot read properties of undefined (reading 'assign')

      15 |   async getData(@User() user: UserDto): Promise<any> {
      16 |     // This line will show in the error, making it seem like the issue is here
    > 17 |     this.logger.assign({ userId: user.id, userName: user.name });
         |                 ^
      18 |     
      19 |     return { message: `Hello user ${user.id}` };
      20 |   }

      at MyController.getData (my.controller.ts:17:17)
      at Object.<anonymous> (my.controller.spec.ts:44:22)