This Gist is a part of the Article: https://prokash-sarkar.medium.com/unit-testing-with-dagger-2-brewing-a-potion-with-fakes-mocks-and-custom-rules-in-android-7f0ab7b22cb

TestAppModule.kt

@Module
class TestAppModule {
    @Singleton
    @Provides
    fun provideTasksRemoteDataSource(
        apiService: ApiService
    ): DataSource {
        return mockk()
    }
}