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diff --git a/testing/web-platform/tests/media-source/mediasource-endofstream.html b/testing/web-platform/tests/media-source/mediasource-endofstream.html
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+++ b/testing/web-platform/tests/media-source/mediasource-endofstream.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Calls to MediaSource.endOfStream() without error</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="mediasource-util.js"></script>
+<script>
+ mediasource_test(function(test, mediaElement, mediaSource)
+ {
+ mediaSource.duration = 2;
+ mediaSource.endOfStream();
+ assert_equals(mediaSource.duration, 0);
+ test.done();
+ }, 'MediaSource.endOfStream(): duration truncated to 0 when there are no buffered coded frames');
+
+ mediasource_testafterdataloaded(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
+ {
+ sourceBuffer.appendBuffer(mediaData);
+ test.expectEvent(sourceBuffer, 'updateend',
+ 'Media buffer appended to SourceBuffer');
+ test.waitForExpectedEvents(function()
+ {
+ mediaSource.endOfStream();
+ test.expectEvent(mediaElement, 'canplaythrough',
+ 'Media element may render the media content until the end');
+ });
+
+ test.waitForExpectedEvents(function()
+ {
+ assert_equals(mediaElement.readyState, HTMLMediaElement.HAVE_ENOUGH_DATA,
+ 'Media element has enough data to render the content');
+ test.done();
+ });
+ }, 'MediaSource.endOfStream(): media element notified that it now has all of the media data');
+
+ mediasource_testafterdataloaded(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
+ {
+ sourceBuffer.appendBuffer(mediaData);
+ test.expectEvent(sourceBuffer, 'updateend',
+ 'Media buffer appended to SourceBuffer');
+ test.waitForExpectedEvents(function()
+ {
+ assert_equals(sourceBuffer.buffered.length, 1,
+ 'Media data properly buffered');
+ var highestEndTime = sourceBuffer.buffered.end(0);
+
+ // Note that segmentInfo.duration is expected to also be the
+ // highest track buffer range end time. Therefore, endOfStream() should
+ // not change duration with this media.
+ assert_approx_equals(segmentInfo.duration, mediaSource.duration, 0.001,
+ 'SegmentInfo duration should initially roughly match mediaSource duration');
+ assert_less_than_equal(highestEndTime, mediaSource.duration,
+ 'Media duration may be slightly longer than intersected track buffered ranges');
+
+ // Set the duration even higher, then confirm that endOfStream() drops it back to be
+ // the highest track buffer range end time.
+ mediaSource.duration += 10;
+ mediaSource.endOfStream();
+
+ assert_equals(sourceBuffer.buffered.length, 1,
+ 'Media data properly buffered after endOfStream');
+
+ assert_approx_equals(segmentInfo.duration, mediaSource.duration, 0.001,
+ 'SegmentInfo duration should still roughly match mediaSource duration');
+ assert_less_than_equal(highestEndTime, mediaSource.duration,
+ 'Media duration may be slightly longer than intersected track buffered ranges');
+ assert_equals(sourceBuffer.buffered.end(0), mediaSource.duration,
+ 'After endOfStream(), highest buffered range end time must be the highest track buffer range end time');
+
+ test.done();
+ });
+ }, 'MediaSource.endOfStream(): duration and buffered range end time before and after endOfStream');
+</script>