Vfrdtyky

I am attempting to write some unit tests for an Android Project, but am struggling to find a solution that fits the architecture that is set in place.

Just for reference, here is an example of the Architecture set in place for Logging in:

LoginFragment

class LoginFragment : Fragment(), Injectable {



    /**

     * VARIABLES

     */



    @Inject

    lateinit var viewModelFactory: ViewModelProvider.Factory

    lateinit var loginViewModel: LoginViewModel



    var binding by autoCleared<LoginFragmentBinding>()

    var dataBindingComponent: DataBindingComponent = FragmentDataBindingComponent(this)



    // Fragment life cycle and other methods



}

LoginViewModel

class LoginViewModel

@Inject constructor(val authRepository: AuthRepository) : ViewModel() {



   fun login(username: String, password: String): LiveData<LoginResponse> { 



    authRepository.login(username, password)





}

LoginRepository

@Singleton

class AuthRepository @Inject constructor(

    val projectService: ProjectService,

    val sessionData: SharedPrefs

) {



     fun login(username: String, password: String): LiveData<LoginResponse> {



         // Login logic



     }

}

Project Service

interface ProjectService {



    @POST("user/login")

    fun postLogin(@Body body: LoginBody): LiveData<ApiResponseWrapper<LoginRemote>>



}

With that, I believe I need to initialize an instance of the LoginFragment in order to access the ViewModel and make to login call. I think this is necessary because the fragment binds everything to work together (not sure, it's not my set up and I'm new to Android Development).

Is there a better way to get access to the ViewModel's login function in order to run Unit Tests on it's calls with the architecture that is set in place?

Moving on, as an example, here is an example of how I am attempting to test logging a user in:

LoginViewModelTests

@Test

fun login() {



    //

    val result = runBlocking {

        loginCoroutine()

    }



    Assert.assertTrue(result)

}



suspend fun loginCoroutine(): Boolean {



    val loginFragment = LoginFragment()



    return suspendCoroutine { continuation ->

        loginFragment.loginViewModel

                .login(maleUsername, malePassword)

                .observe(loginFragment, Observer {

                    loginFragment.activity?.onResult(it?.result,



                            onSuccess = {

                                continuation.resume(true)

                            },

                            onValidationError = {

                                continuation.resume(false)

                            })

                })

    }



}

As you can see, I initialize the LoginFragment in order to call the loginViewModel's login method. And then after completion, I can run my tests on the response.

However, when attempting to run, I get the error:

lateinit property loginViewModel has not been initialized

How do I resolve this issue with it being an injectable lateinit variable? Or what is recommended to test this login method over the implementation I am attempting?