Test 'controls' attribute

EXPECTED (video.controls != 'null') OK
EVENT(canplaythrough)
EXPECTED (video.controls != 'null') OK
RUN(video.removeAttribute('controls'))
EXPECTED (video.controls == 'false') OK
RUN(video.controls = true)
EXPECTED (video.getAttribute('controls') == '') OK
RUN(video.controls = false)
EXPECTED (video.controls == 'false') OK
RUN(video.setAttribute('controls','controls'))
EXPECTED (video.controls != 'null') OK
END OF TEST

