Bug 1703488 [wpt PR 28394] - Tests for unbounded cue end time, a=testonly

Automatic update from web-platform-tests
Tests for unbounded cue end time (#28394)

Added tests for unbounded TextTrackCue endTime changes proposed in whatwg/html#5953 & w3c/webvtt#493
--

wpt-commits: 786c430165d916bdab740ab491ac541afb3f8bf5
wpt-pr: 28394

testing/web-platform/tests/html/semantics/embedded-content/media-elements/interfaces/TextTrackCue/endTime.html

@@ -15,7 +15,8 @@ test(function(){
     c1.endTime = c1.endTime;
     assert_equals(c1.endTime, -1);
     assert_throws_js(TypeError, function(){ c1.endTime = NaN; });
-    assert_throws_js(TypeError, function(){ c1.endTime = +Infinity; });
+    c1.endTime = +Infinity;
+    assert_equals(c1.endTime, +Infinity);
     assert_throws_js(TypeError, function(){ c1.endTime = -Infinity; });
 }, document.title+', script-created cue');
 

testing/web-platform/tests/webvtt/api/VTTCue/constructor-exceptions.html

@@ -8,12 +8,12 @@ test(function() {
     assert_throws_js(TypeError, function() { new VTTCue(NaN, 0, 'foo'); });
     assert_throws_js(TypeError, function() { new VTTCue(Infinity, 0, 'foo'); });
     assert_throws_js(TypeError, function() { new VTTCue('tomorrow', 0, 'foo'); });
-}, document.title+', non-finite start time');
+}, document.title+', invalid start time');
 test(function() {
     assert_throws_js(TypeError, function() { new VTTCue(0, NaN, 'foo'); });
-    assert_throws_js(TypeError, function() { new VTTCue(0, Infinity, 'foo'); });
+    assert_throws_js(TypeError, function() { new VTTCue(0, -Infinity, 'foo'); });
     assert_throws_js(TypeError, function() { new VTTCue(0, 'tomorrow', 'foo'); });
-}, document.title+', non-finite end time');
+}, document.title+', invalid end time');
 test(function() {
     var start = { valueOf: function() { return 42; } };
     var end = { valueOf: function() { return 84; } };

testing/web-platform/tests/webvtt/api/VTTCue/constructor.html

@@ -38,6 +38,13 @@ test(function() {
     assert_equals(cue.endTime, -1);
 }, document.title + ', bad end time');
 
+test(function() {
+    var cue = new VTTCue(2, +Infinity, 'foo bar');
+
+    assert_equals(cue.startTime, 2);
+    assert_equals(cue.endTime, +Infinity);
+}, document.title + ', unbounded end time');
+
 test(function() {
     var cue = new VTTCue(3, 12, '<i>foo bar</i>');