Mockito+Kotlin: set mocks to throw unchecked exceptions

MockitoKotlinHelpers.kt

import org.mockito.BDDMockito

// Use just like a normal .willThrow:
// ```
// given(api.fetch()).willThrowUnchecked(Exception("First error"), Exception("Second error"))
// ```

fun <T> BDDMockito.BDDMyOngoingStubbing<T>.willThrowUnchecked(vararg throwables: Throwable) {
    var invocationNumber = 0
    this.willAnswer {
        val throwableIndex = invocationNumber++.coerceAtMost(throwables.size - 1)
        throw throwables[throwableIndex]
    }
}