CODEWITHSUNDEEP
androidunit-testingkotlinkotlin-coroutines
Aris Guimerá
Aris Guimerá

Reputation: 1017

Run all coroutines class test fail

I was testing my presenter class and all test work. But when I tried to run my test class, all coroutines test fail.

I'm trying reset my dispatch and clean my scope.

private val dispatcher = TestCoroutineDispatcher()

private val testScope = TestCoroutineScope(dispatcher)

@Before
fun setUp() {
    Dispatchers.setMain(dispatcher)
    products = ProductsMotherObject.createEmptyModel()
    getProductsUseCase = GetProductsUseCase(productsRepository)
    updateProductsUseCase = UpdateProductsUseCase(productsRepository)
    presenter = HomePresenter(view, getProductsUseCase, updateProductsUseCase, products)
}

@After
fun after() {
    Dispatchers.resetMain()
    testScope.cleanupTestCoroutines()
}

and this is an example of my tests

@Test
fun `should configure recyclerview if response is success`() = testScope.runBlockingTest {
    //Given
    `when`(productsRepository.getProductsFromApi()).thenReturn(mutableMapOf())

    //when
    presenter.fetchProducts()

    //then
    verify(view).hideLoading()
    verify(view).setUpRecyclerView(products.values.toMutableList())
}

I have only single errors from my tests, but each test works when run single

Upvotes: 1

Views: 757

Answers (1)

Aris Guimerá
Aris Guimerá

Reputation: 1017

Solved. I found this incredible post.

What have I done:

I implemented my dispacher without constructor.

    private val testDispatcher = TestCoroutineDispatcher()

You have to set on @Before function

@Before
fun setUp() {
    Dispatchers.setMain(testDispatcher)
}

And reset after test.

@After
fun after() {
    Dispatchers.resetMain()
    testDispatcher.cleanupTestCoroutines()
}

Finally each test that implements coroutines must launch on MainScope. 

@Test
fun `should configure recyclerview if response is success`() = testDispatcher.runBlockingTest {
    MainScope().launch {
        //Given
        `when`(productsRepository.getProductsFromApi()).thenReturn(mutableMapOf())

        //when
        presenter.fetchProducts()

        //then
        verify(view).hideLoading()
        verify(view).setUpRecyclerView(products.values.toMutableList())
    }
}

Upvotes: 1

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