ybonjour / rxpect

Unit Testing RX Applications

RXpect

RXpect extends Mockito to simplify unit testing for RX Kotlin applications. It takes care of synchronizing your test with your application code.

Test with expectations

class MyPresenter(private val view: MyView) {
    fun onResume() {
        disposable = users.getUsers().subscribeBy {
            onSuccess = { view.show(it)}
            onError = { println("ERROR: $it") }
        }
    }
}

@Test
fun userIsShown() {
    whenever(users.getUsers()).thenReturn(Single.just(user))
    val expectation = expect(view.show(user))
    
    presenter.onResume()
    
    expectation.verify()
}

Test subscribe

class MyPresenter {
    fun onResume() {
        users.getUsers().subscribeBy {
            onSuccess = ::println
            onError = { println("ERROR: $it") }
        }
    }
}

@Test
fun showsUser() {
    val expectation = expectSubscribe(users.getUsers()).thenEmit(user)
    
    presenter.onResume()
        
    expectation.verify()
    
}

Test dispose

class MyPresenter(private val users: Users) {
    private var disposable: Disposable? = null
    
    fun onResume() {
        disposable = users.getUsers().subscribeBy {
            onSuccess = ::println
            onError = { println("ERROR: $it") }
        }
    }
    
    fun onPause() {
        disposable?.dispose()
    }
}

@Test
fun loadingUsersDisposedOnPause() {
    val expectation = expectDispose(users.getUsers()) 
    
    presenter.onResume()
    presenter.onPause()
    
    expectation.verify()
}