Testing the TracksSupport behavior with text tracks.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


The tracks button should be disabled initially as we wait for metadata and text tracks to be added.
PASS mediaController.controls.tracksButton.enabled is false

Eventually the text tracks will be added and the tracks button will be enabled.
PASS mediaController.controls.tracksButton.enabled became true

PASS successfullyParsed is true

TEST COMPLETE