How can I check the constructur arguments of a mockk Mock?-CodePudding

I have the following code (in Kotlin):

class X {
    fun foo() {
        val A(1, true, "three")
        val b = B()
        b.bar(A)
    }
}

What I want to to is find out what A has been instantiated with.

My test code looks like so:

// Needed for something else
every { anyConstructed<A>().go() } returns "testString"

// What I'm using to extract A
val barSlot = slot<A>()
verify { anyConstructed<B>().bar(capture(barSlot)) }
val a = barSlot.captured

How can I check what values A has been instantiated with now I've managed to capture the mock that was created when it was constructed (thanks to the every statement)?

Thanks!

CodePudding user response：

You can do it in two ways:

Using slot to capture the parameter:

@Test
fun shouldCheckValuesAtConstruct() {
    val a = A(1, true, "s")
    val b = mockk<B>()

    val aSlot = slot<A>()
    every { b.bar(a = capture(aSlot)) } returns Unit
    b.bar(a)
    val captured = aSlot.captured

    assertEquals(1, captured.a)
    assertEquals(true, captured.b)
    assertEquals("s", captured.s)
}

Or using withArg function and inline assertions

@Test
fun shouldCheckValuesAtConstructInlineAssertion() {
    val a = A(1, true, "s")
    val b = mockk<B>()

    every { b.bar(a) } returns Unit
    b.bar(a)

    verify {
        b.bar(withArg {
            assertEquals(1, it.a)
            assertEquals(true, it.b)
            assertEquals("s", it.s)
        })
    }
}