LayoutTests/fast/eventloop/queue-task-event-loop-starvation.html

<!DOCTYPE html>
<html>
<body>
<script src="../../resources/js-test.js"></script>
<script>

description('This tests repeated queueing of event loop tasks. Event loop should eventually yield to the run loop.');

if (!window.internals)
    testFailed('This test relies on window.internals');
else {
    jsTestIsAsync = true;
    logs = [];
}

function slowFunction(duration)
{
    const startTime = performance.now();
    while (performance.now() < startTime + duration);
}

let executedTaskCount = 0;
function scheduleSlowTask()
{
    internals.queueTask("DOMManipulation", () => {
        slowFunction(10);
        ++executedTaskCount;
    });
}

function runTest()
{
    setTimeout(() => {
        shouldBeTrue('executedTaskCount < 100');
        finishJSTest();
    }, 100);
    for (let i = 0; i < 100; ++i)
        scheduleSlowTask();
}

onload = runTest;

</script>
</body>
</html>