@Test
 public void bothPlayerDrawWithFifteenShouldReturnFifteenAll() throws Exception {
   tennisGame.playerScore(15, 0);
   tennisGame.playerScore(0, 15);
   String score = tennisGame.getScore();
   assertEquals("Fifteen all", score);
 }
 @Test
 public void playerBWinOneBallAfterDeuceShouldReturnAdvantagePlayerB() throws Exception {
   tennisGame.playerScore(40, 50);
   String score = tennisGame.getScore();
   assertEquals("Advantage Player B", score);
 }
 @Test
 public void playerBWinFirstFourBallShouldReturnWinForPlayerB() throws Exception {
   tennisGame.playerScore(0, 50);
   String score = tennisGame.getScore();
   assertEquals("Win For Player B", score);
 }
 @Test
 public void bothPlayerDrawWithFortyShouldReturnDuce() throws Exception {
   tennisGame.playerScore(40, 40);
   String score = tennisGame.getScore();
   assertEquals("Deuce", score);
 }
 @Test
 public void playerAWinFirstThreeBallShouldReturnFortyLove() throws Exception {
   tennisGame.playerScore(40, 0);
   String score = tennisGame.getScore();
   assertEquals("Forty Love", score);
 }
 @Test
 public void playerBWinInFirstBallShouldReturnLoveFifteen() throws Exception {
   tennisGame.playerScore(0, 15);
   String score = tennisGame.getScore();
   assertEquals("Love Fifteen", score);
 }
 @Test
 public void playerAWinFirstBallShouldReturnFifteenLove() throws Exception {
   tennisGame.playerScore(15, 0);
   String score = tennisGame.getScore();
   assertEquals("Fifteen Love", score);
 }