英文:
spy Mockito with Coroutines
问题
以下是您提供的内容的翻译部分：
我有一个名为 ViewModel 的类。
当变量 shouldCheck 改变时，会调用函数 open。
class ViewModel {
val shouldCheck = MutableLiveData<Boolean>()
val check by lazy {
shouldCheck.switchMap {
liveData(Dispatchers.IO) {
open()
emit(true)
}
}
}
fun open(){
println("我是开放的")
}
}
我创建了一个简单的测试，但验证 open 函数失败了。
@ExperimentalCoroutinesApi
class CoroutineTestRule(private val dispatcher: CoroutineDispatcher = TestCoroutineDispatcher()) : TestWatcher() {
override fun starting(description: Description?) {
super.starting(description)
Dispatchers.setMain(dispatcher)
}
override fun finished(description: Description?) {
super.finished(description)
Dispatchers.resetMain()
}
}
@get:Rule
val coroutineScope = CoroutineTestRule()
@Before
fun setUp() {
viewModel = spy(ViewModel())
}
@Test
fun checkTest() = runBlocking {
// 观察
viewModel.check.observeForever {
// ...
}
// 动作
viewModel.shouldCheck.value = true
// 预期
verify(viewModel, times(1)).open()
}
在调试模式下，我检查了一下，函数 open 被调用了，并打印出 "我是开放的"，但我遇到了这个错误。
Wanted but not invoked:
viewModel.open();
However, there were exactly 2 interactions with this mock:
如果我移除 switchMap 和 `liveData(Dispatchers.IO)`，测试就会通过。但我需要保留它。
英文:
I have a class with the name ViewModel.
When the variable shouldCheck change, the function open is called.
class ViewModel {
val shouldCheck = MutableLiveData<Boolean>()
val check by lazy {
shouldCheck.switchMap {
liveData(Dispatchers.IO) {
open()
emit(true)
}
}
}
fun open(){
println("I am open")
}
}
I create a simple test. but verify function open is failed
@ExperimentalCoroutinesApi
class CoroutineTestRule(private val dispatcher: CoroutineDispatcher = TestCoroutineDispatcher()) : TestWatcher() {
override fun starting(description: Description?) {
super.starting(description)
Dispatchers.setMain(dispatcher)
}
override fun finished(description: Description?) {
super.finished(description)
Dispatchers.resetMain()
}
}
@get:Rule
val coroutineScope = CoroutineTestRule()
@Before
fun setUp() {
viewModel = spy(ViewModel())
}
@Test
fun checkTest() = runBlocking {
// observe
viewModel.check.observeForever {
// ...
}
// Action
viewModel.shouldCheck.value = true
// Expected
verify(viewModel, times(1)).open()
}
in debug mode, I checked that and function open is called.and print "I am open", but I have this error.
Wanted but not invoked:
viewModel.open();
However, there were exactly 2 interactions with this mock:
if I remove switchMap and liveData(Dispatchers.IO) test passed.
but I need it there.
答案1
得分: 0
根据谷歌：
我的建议是像这样注入调度程序：
class MyViewModel(private val ioDispatcher: CoroutineDispatcher)
在测试中使用 TestCoroutineDispatcher，这可能会有所帮助。
英文:
According to Google:
My advice would be to inject the dispatcher like this:
class MyViewModel(private val ioDispatcher: CoroutineDispatcher)
And use the TestCoroutineDispatcher within your tests, this might help
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