add BullyText full-game testing

#### What's this PR do?
This provides an automated test for the Bully Text game. (Exactly the way Science Sleuth was tested: we created four users, and then automate each user's input of 'A' at each point in the game.) 

#### Where should the reviewer start?
The `BullyText.js` file contains all of the changes. I tweaked the name of an endgame test in `testHelperFunctions.js` for clarity, but that's a minor change. 

#### How should this be manually tested?
Running `npm test`!

#### What are the relevant tickets?
Closes #292.