Function assert_poll_is_none

sdl/src/console.rs:727–734

Ensure the console doesn't return a key press for a brief period of time. Given that this is based on timing, the console could still report an event long after we finished polling. This is fine: if the console works well, we shouldn't receive spurious events here, which means that under normal conditions, this is not flaky. However, if there is a bug somewhere, this is not guaranteed to catch i

(console: &mut SdlConsole)

        /// spurious events here, which means that under normal conditions, this is not flaky.
        /// However, if there is a bug somewhere, this is not guaranteed to catch it reliably.
        fn assert_poll_is_none(console: &mut SdlConsole) {
            let mut millis = 10;
            while millis > 0 {
                assert_eq!(None, block_on(console.poll_key()).unwrap());
                thread::sleep(Duration::from_millis(1));
                millis -= 1;
            }
        }

        /// Waits for `console.poll_key` to return `exp_key` and fails the test if it returns any
        /// other key.