Spying on request-scoped provider useless

[xxluke]

Bug Report

Current behavior

When you spy on a request-scoped provider in a unit test, it does not spy on the same instance of the provider which is called in the later code.

Input Code

Example repo: https://github.com/xxluke/nestjs-typescript-starter

@Injectable({scope: Scope.REQUEST})
export class AppService {
    @Inject(REQUEST)
    private readonly request: Request;

    getHello(): string {
        return 'Hello World!';
    }
}

describe('AppController', () => {
    let appController: AppController;
    let appService: AppService;

    beforeAll(async () => {
        const app = await Test.createTestingModule({
            imports: [AppModule],
        }).compile();

        appController = await app.resolve<AppController>(AppController);
        appService = await app.resolve<AppService>(AppService);
    });

    describe('getHello', () => {
        it('should call AppService', () => {
            const spy = jest.spyOn(appService, 'getHello');
            appController.getHello();
            expect(spy).toHaveBeenCalled();
        });
    });
});

Expected behavior

Test succeeds.

Environment

Nest version: 6.6.4

[kamilmysliwiec]

You have created 2 different fake requests here, hence, you have 2 different instances. I'll describe how it works asap, ref https://github.com/nestjs/docs.nestjs.com/issues/623

[lock[bot]]

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