toJSON.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /event-timing/toJSON.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Event Timing: toJSON</title>

<body>

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

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

<script src=/resources/testdriver.js></script>

<script src=/resources/testdriver-vendor.js></script>

<script src=resources/event-timing-test-utils.js></script>

<button id='button'>Generate a 'click' event</button>

<script>

  async_test(function (t) {

    assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');

    const observer = new PerformanceObserver(

      t.step_func_done(function(entryList) {

        const entry = entryList.getEntries()[0];

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

        const json = entry.toJSON();

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

        const keys = [

          // PerformanceEntry

          'name',

          'entryType',

          'startTime',

          'duration',

          // PerformanceEventTiming

          'processingStart',

          'processingEnd',

          'cancelable',

];

        for (const key of keys) {

          assert_equals(json[key], entry[key],

            'PerformanceEventTiming ${key} entry does not match its toJSON value');

        assert_equals(json['target'], undefined, 'toJSON should not include target');

})

);

    observer.observe({type: 'event'});

    clickAndBlockMain('button');

  }, 'Test toJSON() in PerformanceEventTiming.');

</script>

</body>