@Test
 public void testHorizontalWinnerIsEqualToWinnerValue() {
   int[] cell = {0, 1};
   board.setCellValue(cell, 1);
   assertEquals(1, GameState.HorizontalWinner(board));
 }
 @Test
 public void testHorizontalWinnerReturnsZeroForNoWinner() {
   assertEquals(0, GameState.HorizontalWinner(board));
 }