Can Mockito verify parameters based on their values at the time of method call?

Answer 1

The answer of Dawood ibn Kareem worked for me but I lacked an example, also I use Kotlin and Mockito-Kotlin, so my solution is like this:

class Foo(var mutable: String)

interface Bar {
    fun run(foo: Foo)
}

@Test fun `validate mutable parameter at invocation`() {
    val bar = mock()

    var valueAtInvocation: String? = null
    whenever(bar.run(any())).then {
        val foo = it.arguments.first() as Foo
        valueAtInvocation = foo.mutable // Store mutable value as it was at the invocation
        Unit // The answer
    }

    val foo = Foo(mutable = "first")
    bar.run(foo)
    valueAtInvocation isEqualTo "first"

    foo.mutable = "second"
    bar.run(foo)
    valueAtInvocation isEqualTo "second"
}

valueAtInvocation will represent the value of the mutable property foo.mutable at the last invocation of bar.run(foo). Should also be possible to do assertions within the then {} block.