Test SharedWorker event listener. Should print a series of PASS messages, followed with DONE.
SUCCESS: Listener was called.
SUCCESS: Listener was not called after removal.
SUCCESS: Listener was called after GC.
DONE
Test SharedWorker event listener. Should print a series of PASS messages, followed with DONE.
SUCCESS: Listener was called.
SUCCESS: Listener was not called after removal.
SUCCESS: Listener was called after GC.
DONE