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<!DOCTYPE html>
<title>HTMLTrackElement 'src' attribute mutations</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<video>
<track src="resources/settings.vtt" default>
<script>
async_test(function(t) {
var cues = null;
var testTrack = document.querySelector("track");
var stage = 0;
var timer = null;
function step_onLoad() {
switch (stage) {
case 0:
cues = testTrack.track.cues;
assert_equals(testTrack.readyState, HTMLTrackElement.LOADED, "readyState after first loading of the track");
assert_equals(cues.length, 4, "Number of cues after first loading of the track");
++stage;
testTrack.src = "resources/non-existing-file.vtt"; // this should fail
break;
case 1:
case 3:
case 4:
assert_unreached("'error' event did not fire, stage = " + stage);
break;
case 2:
assert_equals(testTrack.readyState, HTMLTrackElement.LOADED, "readyState after loading of the second track");
assert_equals(cues.length, 4, "Number of cues after loading of the second track");
assert_equals(cues[cues.length-1].text, 'I said Bear is coming now!!!! Tab separators.', "Last cue content check");
++stage;
testTrack.src = ""; // this should fail
assert_equals(cues.length, 0, "cues list is reset immediately after 'src' mutation with the new URL");
// This should raise onError event. If no, we'll know about this after some time.
timer = t.step_timeout(t.unreached_func("'error' event is not fired when an empty URL is set"), 100);
break;
default:
assert_unreached("unexpected stage number = " + stage);
break;
}
}
function step_onError() {
switch (stage) {
case 0:
case 2:
assert_unreached("'error' event fired, stage = " + stage);
break;
case 1:
assert_equals(cues, testTrack.track.cues, ".cues object are the same after 'src' attr mutation");
assert_equals(cues.length, 0, "Number of cues after trying to load non-existing url");
assert_equals(testTrack.readyState, HTMLTrackElement.ERROR, "readyState after trying to load non-existing url");
++stage;
testTrack.src = "resources/settings.vtt";
break;
case 3:
clearTimeout(timer);
assert_equals(testTrack.readyState, HTMLTrackElement.ERROR, "readyState after setting an empty URL");
assert_equals(cues, testTrack.track.cues, ".cues object are the same after 'src' attr mutation");
assert_equals(cues.length, 0, "Number of cues with an empty URL set");
++stage;
testTrack.src = "resources/settings.vtt";
// error should happen when we remove `src` during loading, so we have to wait a task because loading starts asynchronously.
t.step_timeout(() => {
testTrack.removeAttribute('src');
// This should raise onError event, so we'll wait for it for some time
timer = t.step_timeout(t.unreached_func("'error' event is not fired when an empty URL is set"), 100);
}, 0);
break;
case 4:
clearTimeout(timer);
assert_equals(testTrack.readyState, HTMLTrackElement.ERROR, "readyState after removing 'src' attr");
assert_equals(cues.length, 0, "Number of cues after removing 'src' attr");
t.done();
break;
default:
assert_unreached("unexpected stage number = " + stage);
break;
}
}
testTrack.onload = t.step_func(step_onLoad);
testTrack.onerror = t.step_func(step_onError);
});
</script>
</video>
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