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<!doctype html>
<title>MediaStreamTrackEvent constructor</title>
<link rel="help" href="https://w3c.github.io/mediacapture-main/#mediastreamtrackevent">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
assert_equals(MediaStreamTrackEvent.length, 2);
assert_throws_js(TypeError, function() {
new MediaStreamTrackEvent("type");
});
assert_throws_js(TypeError, function() {
new MediaStreamTrackEvent("type", null);
});
assert_throws_js(TypeError, function() {
new MediaStreamTrackEvent("type", undefined);
});
}, "The eventInitDict argument is required");
test(function() {
assert_throws_js(TypeError, function() {
new MediaStreamTrackEvent("type", {});
});
assert_throws_js(TypeError, function() {
new MediaStreamTrackEvent("type", { track: null });
});
assert_throws_js(TypeError, function() {
new MediaStreamTrackEvent("type", { track: undefined });
});
}, "The eventInitDict's track member is required.");
test(function() {
// a MediaStreamTrack instance is needed to test, any instance will do.
var context = new AudioContext();
var dest = context.createMediaStreamDestination();
var track = dest.stream.getTracks()[0];
assert_true(track instanceof MediaStreamTrack);
var event = new MediaStreamTrackEvent("type", { track: track });
assert_equals(event.type, "type");
assert_equals(event.track, track);
}, "The MediaStreamTrackEvent instance's track attribute is set.");
</script>
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