Java 是否可以在 Kotlin 中使用 Mockito？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/30305217/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Is it possible to use Mockito in Kotlin?
提问by atok
The problem I'm facing is that Matchers.anyObject()returns null. When used to mock method that only accepts non-nullable types it causes a "Should not be null" exception to be thrown.
我面临的问题是Matchers.anyObject()返回null。当用于模拟只接受不可为空类型的方法时，它会导致抛出“不应为空”异常。
`when`(mockedBackend.login(anyObject())).thenAnswer { invocationOnMock -> someResponse }
Mocked method:
模拟方法：
public open fun login(userCredentials: UserCredentials): Response
采纳答案by Sergey Mashkov
There are two possible workarounds:
有两种可能的解决方法：
private fun <T> anyObject(): T {
Mockito.anyObject<T>()
return uninitialized()
}
private fun <T> uninitialized(): T = null as T
@Test
fun myTest() {
`when`(mockedBackend).login(anyObject())).thenAnswer { ... }
}
The other workaround is
另一个解决方法是
private fun <T> anyObject(): T {
return Mockito.anyObject<T>()
}
@Test
fun myTest() {
`when`(mockedBackend).login(anyObject())).thenAnswer { ... }
}
Here is some more discussionon this topic, where the workaround is first suggested.
以下是有关此主题的更多讨论，其中首先建议了解决方法。
回答by maxandron
I use verifya lot to make sure the parameters passed to a function are also correct.
我使用verify了很多方法来确保传递给函数的参数也是正确的。
To do this, and still avoid the NPE you can use kotlin's elvis operator.
for example:
verify(mock).func(same(my_obj) ?: my_obj)
要做到这一点，并且仍然避免 NPE，您可以使用 kotlin 的 elvis 运算符。例如：
verify(mock).func(same(my_obj) ?: my_obj)
This way, mockito is satisfied because it actually verifies the variable, and kotlin is satisfied because we pass a non null object.
这样，mockito 就满足了，因为它实际上验证了变量，而 kotlin 满足了，因为我们传递了一个非空对象。
Another thing I stumbled upon was the mockito-kotlin library which solves exactly this issue https://github.com/nhaarman/mockito-kotlin
我偶然发现的另一件事是 mockito-kotlin 库，它正好解决了这个问题 https://github.com/nhaarman/mockito-kotlin
回答by makovkastar
You can use the following helper functions to use Mockito's any(), eq() and capture() matchers in Kotlin:
您可以使用以下辅助函数在 Kotlin 中使用 Mockito 的 any()、eq() 和 capture() 匹配器：
/**
* Returns Mockito.eq() as nullable type to avoid java.lang.IllegalStateException when
* null is returned.
*
* Generic T is nullable because implicitly bounded by Any?.
*/
fun <T> eq(obj: T): T = Mockito.eq<T>(obj)
/**
* Returns Mockito.any() as nullable type to avoid java.lang.IllegalStateException when
* null is returned.
*/
fun <T> any(): T = Mockito.any<T>()
/**
* Returns ArgumentCaptor.capture() as nullable type to avoid java.lang.IllegalStateException
* when null is returned.
*/
fun <T> capture(argumentCaptor: ArgumentCaptor<T>): T = argumentCaptor.capture()
See MockitoKotlinHelpers.ktfrom the Android Architecture Blueprints repository by Google.
请参阅Google的 Android 架构蓝图存储库中的MockitoKotlinHelpers.kt。
回答by Shamm
For those who need typed any(type: Class<T>)
对于那些需要打字的人 any(type: Class<T>)
private fun <T> any(type: Class<T>): T = Mockito.any<T>(type)
This would work and the type check also happens!
这会起作用并且类型检查也会发生！
