如何在Kotlin中使用Mockito模拟Lambda

问题描述

我有一个kotlin Android应用程序.有一个函数可以从后端加载合成并将其返回给回调:

I have a kotlin Android app. There is a function that loads compositions from the backend and returns them to a callback:

getCompositons(callback: (Array<Composition>) -> Unit)

我该如何使用Mockito模拟回调.这样我就可以执行以下操作:

How can I mock the callback using mockito. So that I then can do something like this:

var callback = //mockito mock
getCompositons(callback)
verify(callback, timeout(10000)).apply()

我读到lambda与java类型的函数匹配，因此我认为apply可能是调用的方法.也许我可以模拟一个函数并使用它?但是Kotlin函数接口似乎只有一种返回类型，没有参数. java.util.Function表示未解决的引用函数.

I read that lambda are matched to the java type function and therefore I assume apply could be the method invoked. Maybe I could mock a function and use that? But the Kotlin function interface only seems to have one return type, no parameters. java.util.Function says unresolved reference function.

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推荐答案

这与模拟其他任何类型完全没有区别:

This is really no different to mocking any other type:

val callback = mock<(Array<Composition>) -> Unit>()

getCompositons(callback)

verify(callback)(any())  // Or verify(callback).invoke(any()) to be explicit

(如果您不了解它们，我会使用 mockito-kotlin绑定在这里.)

(In case you weren't aware of them, I'm using the mockito-kotlin bindings here.)

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