@Test
 public void testToString() throws StrategyException {
   assertEquals(
       "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n",
       board.toString());
   board.putPieceAt(new Position(0, 0), new Piece(PieceType.BOMB, PlayerColor.RED));
   assertEquals(
       "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n" + "bNNNNN\n",
       board.toString());
   board.putPieceAt(new Position(2, 2), new Piece(PieceType.BOMB, PlayerColor.RED));
   assertEquals(
       "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n" + "NNbNNN\n" + "NNNNNN\n" + "bNNNNN\n",
       board.toString());
   board.putPieceAtRectangle(new Position(1, 4), new Position(0, 5), Piece.WATER_PIECE);
   assertEquals(
       "NNNNNN\n" + "NNNNNN\n" + "NNNNNN\n" + "NNbNNN\n" + "NNNNWW\n" + "bNNNWW\n",
       board.toString());
 }