Hello, team! Question: How can I fix this error in unit testing with Koin? `No definition found for...

# koin

[Mohsen]

Hello, team!
Question: How can I fix this error in unit testing with Koin?

No definition found for type 'com.client.githubusers.data.repository.UsersRepositoryImpl'.

Impl:

class UsersRepositoryTest : KoinTest {

    private val usersRepository: UsersRepository by inject<UsersRepositoryImpl>()

    @OptIn(ExperimentalCoroutinesApi::class)
    private val testScope = TestScope(UnconfinedTestDispatcher())
    private val usersStub = StubUtil.getDummyUsers()
    private val userDetailStub = StubUtil.getDummyUserDetail()

    @Before
    fun setup() {
        startKoin {
            modules(
                module {
                    single<UsersRepository> { UsersRepositoryImpl(get()) }
                })
        }
    }

What am I doing wrong here?

[mkrussel]

The single is for type UserRepository, but the inject is looking for UserRepositoryImpl.

[Mohsen]

Well, that’s true. How can we solve that?

[mkrussel]

Make them the same type based on what you need for the test.

[Mohsen]

It says: Could not create instance for ’[Singleton:‘com.client.githubusers.data.repository.UsersRepositoryImpl’]'

private val usersRepository: UsersRepositoryImpl by inject()

And:

single { UsersRepositoryImpl(get()) }

Maybe I am missing something?

[mkrussel]

I don't know. What is the get in the constructor call supposed to return and is that available?

I doesn't seem like it would be since there is only one module and one item in the module, but my koin knowledge is very limited.

[Mohsen]

It’s an interface in the constructor - just for retrofit purposes.

[mkrussel]

Where is koin supposed to get an instance of that interface?

[Mohsen]

Good point. I missed that.

So now I have:

private val usersRepository: UsersRepositoryImpl by inject()
private val usersApi: UsersApi by inject()

module {
    single { UsersRepositoryImpl(usersApi) }
})

[Mohsen]

Sorry for the noob questions, I just started using it in testing.

[mkrussel]

But the inject still cannot find it because it is not in your module.

You need to create an instance of the api somewhere, just like you do in the app.

[mkrussel]

I think you need to add another single to your module. And either create a fake instance of the api or add more code that initializes retrofit to be able to create the real version of the api.