loaf-toJSON.html - mozsearch

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /long-animation-frame/tentative/loaf-toJSON.html - WPT Dashboard Interop Dashboard

<!doctype html>

<html>

<head>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

</head>

<body>

<script>

  promise_test(async t => {

    window.onload = () => {

        // Trigger a long task.

        const begin = window.performance.now();

        while (window.performance.now() < begin + 60);

};

    assert_implements(window.PerformanceLongAnimationFrameTiming, 'Lon are not supported.');

    const entry = await new Promise(resolve => new PerformanceObserver(

      t.step_func(entryList => {

        const entries = entryList.getEntries();

        assert_greater_than_equal(entries.length, 1);

        resolve(entries[0]);

      })).observe({entryTypes: ["long-animation-frame"]}));

    assert_equals(typeof(entry.toJSON), 'function');

    const entryJSON = entry.toJSON();

    assert_equals(typeof(entryJSON), 'object');

    // Check attributes inheritted from PerformanceEntry.

    const performanceEntryKeys = [

        'name',

        'entryType',

        'startTime',

        'duration',

        'renderStart',

        'styleAndLayoutStart',

        'blockingTime',

        'firstUIEventTimestamp'

];

    for (const key of performanceEntryKeys) {

        assert_equals(entryJSON[key], entry[key],

            `entry.toJSON().${key} should match entry.${key}`);

  }, 'Test toJSON() in PerformanceLongAnimationFrameTiming');

</script>

</body>

</html>