object MockkInstant {
    var value: Instant = Instant.now()

    fun mock() {
        mockkStatic(Instant::class)

        every {
            Instant.now()
        } answers {
            value.minusMillis(0) // line 22 from stack trace below
        }
    }

    fun clear() {
        clearStaticMockk(Instant::class)
    }

    fun step(duration: Duration = 1.seconds) {
        value = value.add(duration) // extension function defined elsewhere
    }
}

"fixes calls to Instant.now()" {
    val a = Instant.now()
    delay(1)
    val b = Instant.now()
    a.shouldBe(b)
}

answers

Empty list doesn't contain element at index 0.
java.lang.IndexOutOfBoundsException: Empty list doesn't contain element at index 0.
	at kotlin.collections.EmptyList.get(Collections.kt:35)
	at kotlin.collections.EmptyList.get(Collections.kt:23)
	at io.mockk.MockKAnswerScope.getValueAny(API.kt:3834)
	at io.mockk.MockKAnswerScope.getValue(API.kt:2188)
	at io.glimpseprotocol.testing.mockk.MockkInstant$mock$2.invoke(MockkInstant.kt:22)
	at io.glimpseprotocol.testing.mockk.MockkInstant$mock$2.invoke(MockkInstant.kt:13)
	at io.mockk.MockKStubScope$answers$1.invoke(API.kt:2092)
	at io.mockk.MockKStubScope$answers$1.invoke(API.kt:2069)
	at io.mockk.FunctionAnswer.answer(Answers.kt:19)
...