LayoutTests/media/video-src-change.html

<video src=bogus controls></video>
<div>
Test that changing src attribute triggers load when network state is empty.<br>
Test that it does not trigger load when network state is non-empty.
</div>
<script src=video-test.js></script>
<script>
waitForEvent('emptied', function () {
    test('video.networkState == HTMLMediaElement.EMPTY');
    video.setAttribute('src', 'content/test.mp4')
    waitForEventAndTest('begin', "relativeURL(video.currentSrc) == 'content/test.mp4'");
    waitForEvent('load', function () {
        test('video.networkState != HTMLMediaElement.EMPTY');
        video.setAttribute('src', 'content/test.wav');
        waitForEventAndFail('begin');
        setTimeout(endTest, 500);
    });
});
</script>