}
            assertThat(
                exceptionOrNullFrom { scope.close() },
                instanceOf(TimeoutException::class.java)
            )
        }
    }

    private
    fun awaitExceptionFrom(scope: IOScope) =
        await atMost ONE_SECOND untilNotNull { exceptionOrNullFrom { scope.io { } } }

    private
    fun exceptionOrNullFrom(action: () -> Unit) = runCatching(action).exceptionOrNull()