Mockito ArgumentCaptor for Kotlin function

Question

I recommend nhaarman/mockito-kotlin: Using Mockito with Kotlin

It solves this through an inline function with a reified type parameter:

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

Source: mockito-kotlin/ArgumentCaptor.kt at a6f860461233ba92c7730dd42b0faf9ba2ce9281 · nhaarman/mockito-kotlin

e.g.:

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

or

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