dagger module in test/ folder - https://proandroiddev.com/unit-tests-with-dagger2-retrofit2-rxjava2-and-mockk-android-1c268fa77957

TestApplicationModule.kt

class TestApplicationModule(delegate: GDelegate) : ApplicationModule(delegate) {
    override fun giveAppAPIs(): AppAPIs = mockk()

    override fun giveRetrofitService(okHttpClient: OkHttpClient): AppAPIs = mockk()

    override fun giveOkHttpClient(loggingInterceptor: HttpLoggingInterceptor): OkHttpClient = mockk()

    override fun giveLoggingInterceptor(): HttpLoggingInterceptor = mockk()
}