问题
I have a suspending functions that I have mocked, using Mockito but it is returning null
both projects use
'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.0'
Example 1
here is my test in which the mock is returning null
@Test
fun `when gps not enabled observer is notified`() = runBlocking {
// arrange
`when`(suspendingLocationService.getCurrentLocation()).thenReturn(result) // <- when called this returns null
// act
presenter.onStartShopButtonClick()
// assert
verify(view).observer
verify(observer).onPrepareShop()
}
I have the below implementation in my presenter
override suspend fun onStartShopButtonClick() {
val result = suspendingLocationService.getCurrentLocation() // <- in my test result is null!!!!!!
view?.apply {
observer?.onPrepareShop()
when {
result.hasGivenPermission == false -> observer?.onStartShop(StoreData(), APIError(APIError.ErrorType.NO_PERMISSION))
result.hasGPSEnabled == false -> observer?.onStartShop(StoreData(), APIError(APIError.ErrorType.GPS_NOT_ENABLED))
result.latitude != null && result.longitude != null ->
storeLocationService.getCurrentStore(result.latitude, result.longitude) { store, error ->
observer?.onStartShop(store, error)
}
}
}
}
however I have what I believe to a very similar implementation that is working below
Example 2
The below test does pass and the correct the function does respond with a product
@Test
fun `suspending implementation updates label`() = runBlocking {
// arrange
`when`(suspendingProductProvider.getProduct("testString")).thenReturn(product)
// act
presenter.textChanged("testString")
// assert
verify(view).update(product.name)
}
here is the implementation of the presenter
override suspend fun textChanged(newText: String?) {
val product = suspendingNetworkProvider.getProduct(newText)
view?.update(product.name)
}
here is the interface I am mocking
interface SuspendingProductProvider {
suspend fun getProduct(search: String?): Product
}
what I am not doing in the first example
回答1:
Mockito has a special support for suspend
functions, but in Kotlin 1.3 there were some changes in how coroutines are implemented internally, so older versions of Mockito are no longer recognize suspend
methods compiled by Kotlin 1.3. And kotlinx.coroutines
use Kotlin 1.3 since version 1.0.0.
Corresponding support was added to Mockito, but only since version 2.23, so updating your Mockito version will help.
来源:https://stackoverflow.com/questions/53098975/mocked-suspend-function-returns-null-in-mockito