@Test
 public void testClearAllByColor() {
   abg.clearAllByColor(Color.WHITE);
   assertTrue(abg.getAllPiecesByColor(Color.WHITE).size() == 0);
 }
 @Test
 public void testGetAllByColor() {
   ArrayList<GamePiece> game_piece = abg.getAllPiecesByColor(Color.WHITE);
   assertTrue(game_piece.size() == 16);
 }