Add getCurrentSpeech() function & tests

[desko27]

No description provided.

[zhouzi]

@desko27 Thank you so much for contributing and taking the time to add documentation and tests! 👍 I am wondering what is the expected behavior for the following use case:

theater
  .addActor('vader')
  .addScene('vader:Luke...')
  .on('erase:start', function () {
    console.log(theater.getCurrentSpeech())
  })

The erase scene doesn't have the speech in its arguments so it will log undefined. Is that what is expected? If so, it'd be great to have a test case covering that.

[desko27]

@zhouzi You're totally right! Added null test case and reorganized getCurrentSpeech()'s code to make it simpler.

Thanks for this amazing library 👍🏻

[zhouzi]

Thank you @desko27 👍