Cannot write or execute Unit test case for Controller. Need Help Quick [HIGH PRIORITY]

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[ ] Regression 
[ ] Bug report
[ ] Feature request
[ ] Documentation issue or request
[x] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

I am trying to build and run unit test cases. Inside documentation there is limited help. I am going to use NESTJS in my production app for next release before I do I am writing unit test cases for my code before my next revision. My api is functional and throughly tested using postman and also integrated with my app. However my I having hard time writing test cases or creating instances of controller in my test cases and execute it’s method. I did however tried docs https://www.docs.nestjs.com/fundamentals/unit-testing it does not work for me login.controller.ts

@Controller('login')
export class LoginController {
       constructor(private readonly loginService: LoginService,
                private readonly usersService: UsersService,
                private readonly authService: AuthService,
                private readonly userDetailsService: UserDetailsService) {

    }
@Post('send')
    @HttpCode(HttpStatus.OK)
sendOtp(@Body() requestBody){
// some functional action that works goes here

const data = requestBody;
//this is working fine as api and in app too
this.saveUserVerificationData(data);

}

saveUserVerificationData = async (data) => {
        try {
            return await this.loginService.create(data);
        } catch (e) {
            Logger.error('Error at saveUserVerificationData' + e);
        }

    }
}

login.spec.ts

describe('test otp positive test cases', async () => {
    it('hello', async () => {
    let loginController: LoginController;
    const module = await Test.createTestingModule({
            controllers: [LoginController],
        }).compile();
    Logger.log('helloooooooooo');
    loginController = module.get<LoginController>(OtpController);

    const loginCodeObject = Utils.getOtpObject(AppConstants.OTP_SMS_INDIA);
    const smsObj = {route: 'otp', phoneNo: '7710004852', c_code: '+91', msg: otpCodeObject.message};


    const loginSendRequest = { phoneNumber: '7710004852', countryCode: '+91', country: 'IN' };
    const loginSendResult = await loginController.sendOtp(loginSendRequest);
    expect(loginSendResult.status).to.equal(1);
});
});

command to run existing unit test case:

env-cmd …/.env nyc --require ts-node/register mocha src/modules/otp/otp.spec.ts --reporter spec

Expected behavior

I want to be able to create instance of otpController and be able to call sendOtp

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Error: Nest can’t resolve dependencies of the LoginController (?, +, +, +). Please verify whether [0] argument is available in the current context. at Injector.<anonymous> (node_modules/@nestjs/core/injector/injector.js:160:23) at Generator.next (<anonymous>) at fulfilled (node_modules/@nestjs/core/injector/injector.js:4:58) at <anonymous>

Environment

Nest version: 4.6.6

 
For Tooling issues:
- Node version: 9.11.1  
- Platform:  MAC OSX 10.13.4 

Others:

[nileshdattatraykedare]

Thanks for you replies and support @adrien2p

I finally got it worked:

let loginController: LoginController;
const getModule = async () => {
        const module = await Test.createTestingModule({
            imports: [DatabaseModule],
            controllers: [LoginController],
            components: [
                LoginService,
                ...loginProviders,
                UsersService,
                ...usersProviders,
                AuthService,
                ...authProviders,
                UserDetailsService,
                ...usersProviders,
            ],
        }).compile();
        return module;
    };
const testOne = async () => {
    const module = await getModule();

    otpController = await module.get<LoginController>(LoginController);
    const result = await loginController.sendOtp({
        phoneNumber: '9892480425',
        countryCode: '+91', country: 'IN'});
    return result;
};

describe('started testing fresh', () => {
    it('send otp', async () => {
        const result = await testOne();
        expect(result.status).to.equal(1);
    });
});

command:

env-cmd ../.env nyc --require ts-node/register mocha --timeout 15000 src/modules/login/login.spec.ts --reporter spec

result

started testing fresh ✓ send otp

1 passing (26ms)

[lock[bot]]

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