Created
August 19, 2020 17:14
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A test sample on a use-case which returns an Arrow Either value
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private const val DEFAULT_INTEGER_VALUE = -1 | |
private const val DEFAULT_STRING_VALUE = "none" | |
@ExperimentalCoroutinesApi | |
class FetchNumberFactUcTest { | |
private lateinit var usecase: DomainlayerContract.Presentation.UseCase<NumberFactRequest, NumberFactResponse> | |
private lateinit var mockRepository: DomainlayerContract.Data.DataRepository<NumberFactResponse> | |
@Before | |
fun setUp() { | |
mockRepository = mock() | |
usecase = FetchNumberFactUc(numberDataRepository = mockRepository) | |
} | |
@After | |
fun tearDown() { | |
} | |
@Test | |
fun `Given null parameters, when usecase is invoked -- 'InputParamsError' is returned`() = runBlockingTest { | |
// given | |
val nullParams = null | |
// when | |
val response = usecase.run(params = nullParams) | |
// then | |
Assert.assertTrue(response.isLeft() && (response as? Either.Left<Failure>)?.a is Failure.InputParamsError) | |
} | |
// TODO: this test fails because the 'repository' instance is not accessible, i.e. cannot be mocked/stubbed | |
@Test | |
fun `Given right parameters, when usecase is invoked -- 'NumberFactResponse' data is returned`() = runBlockingTest { | |
// given | |
val rightParams = NumberFactRequest(number = DEFAULT_INTEGER_VALUE) | |
whenever(mockRepository.fetchNumberFact(request = rightParams)).doReturn(getDummyNumberFactResponse().right()) | |
// when | |
val response = usecase.run(params = rightParams) | |
// then | |
Assert.assertTrue(response.isRight() && (response as? Either.Right<NumberFactResponse>) != null) | |
} | |
private fun getDummyNumberFactResponse() = NumberFactResponse(fact = DEFAULT_STRING_VALUE) | |
} |
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