
PASS SpeechSynthesisEvent with no arguments throws TypeError
PASS SpeechSynthesisEvent with no eventInitDict throws TypeError
PASS SpeechSynthesisEvent with empty eventInitDict throws TypeError (requires
    utterance)
PASS SpeechSynthesisEvent with eventInitDict not having utterance throws
    TypeError
FAIL SpeechSynthesisEvent with eventInitDict having an utterance Illegal constructor
FAIL SpeechSynthesisEvent with custom eventInitDict Illegal constructor