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<html>
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<head>
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<meta charset="UTF-8">
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<title>Test Behavior During Timer Flood</title>
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<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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</head>
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<body>
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<script type="application/javascript">
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SimpleTest.waitForExplicitFinish();
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// This test takes a long time to run and it times out on Android debug as a result.
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SimpleTest.requestLongerTimeout(5);
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function onLoad() {
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return new Promise(resolve => {
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addEventListener('load', resolve, { once: true });
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});
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}
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function setPrefs() {
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// Put timeouts randomly in the tracking or normal buffer. We do this in order to
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// test to ensure that by default, this will not change the scheduling of timeouts.
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return SpecialPowers.pushPrefEnv({"set": [["dom.timeout_bucketing_strategy", 3]]});
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}
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// Create a frame that executes a timer flood. The frame signals
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// that is ready once the flood has had a chance to warm up.
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function withFloodFrame() {
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return new Promise((resolve, reject) => {
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let frame = document.createElement('iframe');
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addEventListener('message', function onMsg(evt) {
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if (evt.data === 'STARTED') {
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removeEventListener('message', onMsg);
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resolve(frame);
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} else if (evt.data == 'OUT_OF_ORDER') {
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ok(false, "Out of order timeout observed");
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reject();
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}
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});
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frame.src = 'file_timer_flood.html';
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document.body.appendChild(frame);
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});
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}
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// Test that we can load documents during a timer flood.
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function testFrameLoad() {
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return new Promise(resolve => {
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let frame = document.createElement('iframe');
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frame.addEventListener('load', _ => {
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frame.remove();
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resolve();
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}, { once: true });
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document.body.appendChild(frame);
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});
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}
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// Test that we can perform network requests while a timer flood
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// is occuring.
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function testFetch(url) {
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return fetch(url).then(response => {
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return response.text();
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});
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}
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// Test that we can run animations for 5 seconds while a timer
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// flood is occuring.
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function testRequestAnimationFrame() {
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return new Promise(resolve => {
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let remainingFrames = 5 * 60;
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function nextFrame() {
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remainingFrames -= 1;
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if (remainingFrames > 0) {
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requestAnimationFrame(nextFrame);
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} else {
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resolve();
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}
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};
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requestAnimationFrame(nextFrame);
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});
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}
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let floodFrame;
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onLoad()
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.then(setPrefs)
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.then(_ => {
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// Start a timer flood in a frame.
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return withFloodFrame();
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}).then(frame => {
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floodFrame = frame;
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// Next we are going to start a bunch of asynchronous work that we
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// expect to complete in spite of the timer flood. The type of work
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// is a bit arbitrary, but is chosen to reflect the kinds of things
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// we would like the browser to be able to do even when pages are
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// abusing timers. Feel free to add more types of work here, but
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// think carefully before removing anything.
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let tests = [];
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// Verify we can perform a variety of work while the timer flood
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// is running.
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for (let i = 0; i < 20; ++i) {
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tests.push(testFrameLoad());
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tests.push(testFetch('file_timer_flood.html'));
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}
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// Verify that animations still work while the timer flood is running.
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// Note that we do one long run of animations instead of parallel runs
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// like the other activities because of the way requestAnimationFrame()
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// is scheduled. Parallel animations would not result in any additional
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// runnables be placed on the event queue.
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tests.push(testRequestAnimationFrame());
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// Wait for all tests to finish. If we do not handle the timer flood
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// well then this will likely time out.
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return Promise.all(tests);
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}).then(_ => {
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ok(true, 'completed tests without timing out');
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floodFrame.remove();
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SimpleTest.finish();
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}).catch(_ => {
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SimpleTest.finish();
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});
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</script>
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</body>
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</html>
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