Test to see if media loads automatically when 'preload' is specified.


Will load with 'preload=none', should not buffer automatically until 'play()' is called
RUN(video.setAttribute('preload', 'none'))
RUN(video.removeAttribute('autoplay'))
EVENT(loadstart)
did not buffer automatically OK
RUN(handlePromise(video.play()))
EVENT(play)
EVENT(loadedmetadata)
buffered automatically OK

Will load with 'preload=metadata', should buffer automatically 
RUN(video.setAttribute('preload', 'metadata'))
RUN(video.removeAttribute('autoplay'))
EVENT(loadstart)
EVENT(loadedmetadata)
buffered automatically OK

Will load with 'preload=auto', should buffer automatically 
RUN(video.setAttribute('preload', 'auto'))
RUN(video.removeAttribute('autoplay'))
EVENT(loadstart)
EVENT(loadedmetadata)
buffered automatically OK

Will load with 'preload=none', should buffer automatically because of 'autoplay'
RUN(video.setAttribute('preload', 'none'))
RUN(video.setAttribute('autoplay', 'true'))
EVENT(loadstart)
EVENT(loadedmetadata)
buffered automatically OK

END OF TEST