media-source/mediasource-trackdefaultlist.html

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<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
    test(function()
    {
        var originalTrackDefaults = [
            // Same everything, but different byteStreamTrackID, should be allowed by the constructor.
            new TrackDefault("audio", "en-US", "label", ["main"], ""),
            new TrackDefault("audio", "en-US", "label", ["main"], "1"),
            new TrackDefault("audio", "en-US", "label", ["main"], "2"),
            new TrackDefault("audio", "en-US", "label", [""], "3"),

            // Same everything, but different type, should be allowed by the constructor.
            new TrackDefault("video", "en-US", "label", ["main"], ""),
            new TrackDefault("video", "en-US", "label", ["main"], "1"),
            new TrackDefault("video", "en-US", "label", ["main"], "2"),
            new TrackDefault("video", "en-US", "label", [""], "3")
        ];

        // Get a new array containing the same objects as |originalTrackDefaults|.
        var trackDefaults = originalTrackDefaults.slice();

        var trackDefaultList = new TrackDefaultList(trackDefaults);
        assert_array_equals(trackDefaultList, originalTrackDefaults, "construction and read-back succeeded");
        assert_equals(trackDefaultList[trackDefaultList.length], undefined, "out of range indexed property getter result is undefined");
        assert_equals(trackDefaultList[trackDefaultList.length + 1], undefined, "out of range indexed property getter result is undefined");

        // Introduce same-type, same-empty-string-byteStreamTrackId conflict in trackDefaults[0 vs 4].
        trackDefaults[4] = new TrackDefault("audio", "en-US", "label", ["main"], "");
        assert_equals(trackDefaults[0].type, trackDefaults[4].type, "same-type conflict setup");
        assert_equals(trackDefaults[0].byteStreamTrackID, trackDefaults[4].byteStreamTrackID, "same-byteStreamTrackID conflict setup");
        assert_throws_dom("InvalidAccessError",
            function() { new TrackDefaultList(trackDefaults); },
            "TrackDefaultList construction should throw exception due to same type and byteStreamTrackID across at least 2 items in trackDefaults");

        // Introduce same-type, same-non-empty-string-byteStreamTrackId conflict in trackDefaults[4 vs 5].
        trackDefaults[4] = new TrackDefault("video", "en-US", "label", ["main"], "1");
        assert_equals(trackDefaults[4].type, trackDefaults[5].type, "same-type conflict setup");
        assert_equals(trackDefaults[4].byteStreamTrackID, trackDefaults[5].byteStreamTrackID, "same-byteStreamTrackID conflict setup");
        assert_throws_dom("InvalidAccessError",
            function() { new TrackDefaultList(trackDefaults); },
            "TrackDefaultList construction should throw exception due to same type and byteStreamTrackID across at least 2 items in trackDefaults");

        // Confirm the constructed TrackDefaultList makes a shallow copy of the supplied TrackDefault sequence.
        assert_array_equals(trackDefaultList, originalTrackDefaults, "read-back of original trackDefaultList unchanged");

    }, "Test track default list construction, length, and indexed property getter");

    test(function()
    {
        var trackDefaultList = new TrackDefaultList();
        assert_array_equals(trackDefaultList, [], "empty list constructable without supplying optional trackDefaults parameter");

        trackDefaultList = new TrackDefaultList([]);
        assert_array_equals(trackDefaultList, [], "empty list constructable by supplying empty sequence as optional trackDefaults parameter");
    }, "Test empty track default list construction with and without optional trackDefaults parameter");
</script>