fix flaky video js test

TNL-6748

common/lib/xmodule/xmodule/js/spec/video/html5_video_spec.js

@@ -41,19 +41,17 @@
                             expect(state.videoPlayer.player.video.play).toHaveBeenCalled();
                         });
 
-                        // Failing on master. See TNL-6748.
-                        xit('player state was changed', function(done) {
+                        it('player state was changed', function(done) {
                             jasmine.waitUntil(function() {
                                 return state.videoPlayer.player.getPlayerState() === STATUS.PLAYING;
                             }).always(done);
                         });
 
-                        // Flaky. Checking the parameters of calls to onStateChange() will likely be more reliable.
-                        xit('callback was not called', function(done) {
+                        it('callback was called', function(done) {
                             jasmine.waitUntil(function() {
                                 return state.videoPlayer.player.getPlayerState() !== STATUS.PAUSED;
                             }).then(function() {
-                                expect(state.videoPlayer.player.callStateChangeCallback).not.toHaveBeenCalled();
+                                expect(state.videoPlayer.player.callStateChangeCallback).toHaveBeenCalled();
                             }).always(done);
                         });
                     });
@@ -105,8 +103,9 @@
                         jasmine.waitUntil(function() {
                             return state.videoPlayer.player.getPlayerState() !== STATUS.PAUSED;
                         }).then(function() {
-                            expect(state.videoPlayer.player.getPlayerState())
-                                .toBe(STATUS.BUFFERING);
+                            expect([STATUS.BUFFERING, STATUS.PLAYING]).toContain(
+                                state.videoPlayer.player.getPlayerState()
+                            );
                         }).always(done);
                     });