Tests that AudioBufferSourceNode validates start and stop calls.

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

PASS bufferSource.stop(0) threw exception InvalidStateError: cannot call stop without calling start first..
PASS bufferSource.start(0) threw exception InvalidStateError: Cannot call start more than once..
PASS InvalidStateError did not throw exception.
PASS successfullyParsed is true

TEST COMPLETE