Function run_until_stalled_test 

pub fn run_until_stalled_test<F, Fut, R>(
    fake_time: bool,
    test: F,
    options: TestOptions,
) -> R
where
    F: 'static + Sync + Fn(usize) -> Fut,
    Fut: 'static + Future<Output = R>,
    R: TestResult,

Runs a test in an executor until it’s stalled.