Add code to change score method test from pending to passing.
Make opponent test pass.
Add code to pass wins_ball method, edited test method to pass.
Add pending tests for advantage, duece and win.
Add passing test for duece.
Add failing test for win.
Add failing test for advantage.
Add passing test for advantage.
Edited code for duece conditional to allow for returning to duece.
Add passing code for win conditional.