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import io.mockk.every
import io.mockk.mockk
import io.mockk.verify
import io.reactivex.Single
import io.reactivex.schedulers.TestScheduler
import org.junit.Test
fun `GIVEN unsuccessful data fetch WHEN screen opens THEN display error`() {
val view: MainScreenContract.View = mockk(relaxed = true)
val fetchCurrencyUseCase: FetchCurrencyUseCase = mockk {
every { execute() } returns Single.error(Throwable("error occurred"))
val presenter = MainScreenPresenter(
fetchCurrencyUseCase = fetchCurrencyUseCase,
schedulerProvider = TrampolineTestSchedulers()
verify {
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