Mockito ArgumentCaptor用于Kotlin函数

问题描述

考虑一个将接口实现作为参数的函数，如下所示:

Consider a function that takes an interface implementation as an argument like this:

interface Callback {
    fun done()
}

class SomeClass {        

    fun doSomeThing(callback: Callback) {

        // do something

        callback.done()

    }    
}

当我想测试此函数的调用者时，我可以做类似的事情

When I want to test the caller of this function, I can do something like

val captor = ArgumentCaptor.forClass(Callback::class)
Mockito.verify(someClass).doSomeThing(captor.capture())

要测试调用回调时另一个类的作用，我可以做

To test what the other class does when the callback is invoked, I can then do

captor.value.done()

问题:如果我用

fun doSomeThing(done: () -> Unit) {

    // do something

    done.invoke()

}

可以使用ArgumentCaptor做到这一点吗，我必须在ArgumentCaptor.forClass(???)

Can this be done with ArgumentCaptor and what class do I have to use in ArgumentCaptor.forClass(???)

推荐答案

我建议 nhaarman/mockito-kotlin:将Mockito与Kotlin结合使用

它通过内联函数和修饰的类型参数:

inline fun <reified T : Any> argumentCaptor() = ArgumentCaptor.forClass(T::class.java)

来源: mockito-kotlin/ArgumentCaptor.kt，网址为a6f860461233ba92c7730dd42b0faf9ba2ce9281·nhaarman/mockito-kotlin

例如:

val captor = argumentCaptor<() -> Unit>()
verify(someClass).doSomeThing(captor.capture())

或

val captor: () -> Unit = argumentCaptor()
verify(someClass).doSomeThing(captor.capture())

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