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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>LongTask Timing: Promise resolvers</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<h1>Long Task: promise resolvers</h1>
<script>
function test_promise_long_task(name, promise) {
promise_test(async t => {
assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
const longTaskPromise = new Promise(resolve => {
const observer = new PerformanceObserver(t.step_func(entryList => {
observer.disconnect();
resolve(entryList.getEntries());
}));
observer.observe({entryTypes: ['longtask']});
});
await promise().catch(() => {});
busyWait();
const entries = await longTaskPromise;
assert_greater_than_equal(entries.length, 1);
}, `Performance longtask entries after a promise: ${name}`);
}
test_promise_long_task("successful fetch", () => fetch("/common/dummy.xml"));
test_promise_long_task("Response.text()", () =>
fetch("/common/dummy.xml").then(r => r.text()));
test_promise_long_task("rejected fetch", () => fetch("/common/non-existent.xml"));
test_promise_long_task("JSON error", () => fetch("/common/dummy.xml").then(r => r.json()));
</script>
</body>
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