如何使用Mockk调用Lambda回调 [英] How to call a lambda callback with mockk

问题描述

我用ockk创建一个类的模型. 在此模拟上，我现在调用一个将lambda作为参数的方法.

I create a mock of a class with mockk. On this mock I now call a method that gets a lambda as a parameter.

此lambda用作回调，以将回调的状态更改传递给方法的调用方.

This lambda serves as a callback to deliver state changes of the callback to the caller of the method.

class ObjectToMock() {
    fun methodToCall(someValue: String?, observer: (State) -> Unit) {
        ...
    }
}

如何配置模拟以调用传递的lambda?

How do I configure the mock to call the passed lambda?

推荐答案

您可以使用 answers :

You can use answers:

val otm: ObjectToMock = mockk()
every {  otm.methodToCall(any(), any())} answers {
    secondArg<(String) -> Unit>().invoke("anything")
}

otm.methodToCall("bla"){
    println("invoked with $it") //invoked with anything
}

在answers范围内，您可以访问firstArg，secondArg等，甚至可以通过将其作为通用参数提供来获得预期的类型.请注意，我使用invoke使其更具可读性，也可以将其作为带空括号的普通函数来调用.

Within the answers scope you can access firstArg, secondArg etc and even get the expected type by providing it as a generic parameter. Note that I used invoke to make it more readable, you can also invoke it as a normal function with empty parentheses.

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