assert(b.toFEN().equals("r3kbnr/ppqbpppp/2np4/8/2BNP3/2N5/PPP2PPP/R1BQ1RK1 b kq - 3 7"));
        b.do_black_queenside_castling();
        assert(b.toFEN().equals("2kr1bnr/ppqbpppp/2np4/8/2BNP3/2N5/PPP2PPP/R1BQ1RK1 w - - 4 8"));
<<<<<<< HEAD
=======
        // en passant:
        Board b2 = new Board("k7/p7/8/1P4p1/8/8/7P/K7 b - - 0 1");
        b2.do_normal_black_move('a','7','a','5');
        assert(b.toFEN().equals("k7/8/8/pP4p1/8/8/7P/K7 w - a6 0 2"));
        b2.do_normal_white_move('b','5','a','6');
        assert(b.toFEN().equals("k7/8/P7/6p1/8/8/7P/K7 b - - 0 2"));
        b2.do_normal_black_move('g','5','g','4');
        assert(b.toFEN().equals("k7/8/P7/8/6p1/8/7P/K7 w - - 0 3"));
        b2.do_normal_white_move('h','2','h','4');
        assert(b.toFEN().equals("k7/8/P7/8/6pP/8/8/K7 b h3 0 3"));
        b2.do_normal_black_move('g','4','h','3');
        assert(b.toFEN().equals("k7/8/P7/8/8/7p/8/K7 w - 0 4"));
        */
>>>>>>> 51c0045b6e26830528512c82e58467a04922a172
      }
      // testing setting and resetting
      {

        assert(b.toFEN().equals("r3kbnr/ppqbpppp/2np4/8/2BNP3/2N5/PPP2PPP/R1BQ1RK1 b kq - 3 7"));
        b.do_black_queenside_castling();
        assert(b.toFEN().equals("2kr1bnr/ppqbpppp/2np4/8/2BNP3/2N5/PPP2PPP/R1BQ1RK1 w - - 4 8"));
        // en passant:
        Board b2 = new Board("k7/p7/8/1P4p1/8/8/7P/K7 b - - 0 1");
        b2.do_normal_black_move('a','7','a','5');
        assert(b.toFEN().equals("k7/8/8/pP4p1/8/8/7P/K7 w - a6 0 2"));
        b2.do_normal_white_move('b','5','a','6');
        assert(b.toFEN().equals("k7/8/P7/6p1/8/8/7P/K7 b - - 0 2"));
        b2.do_normal_black_move('g','5','g','4');
        assert(b.toFEN().equals("k7/8/P7/8/6p1/8/7P/K7 w - - 0 3"));
        b2.do_normal_white_move('h','2','h','4');
        assert(b.toFEN().equals("k7/8/P7/8/6pP/8/8/K7 b h3 0 3"));
        b2.do_normal_black_move('g','4','h','3');
        assert(b.toFEN().equals("k7/8/P7/8/8/7p/8/K7 w - 0 4"));
      }
      // testing setting and resetting
      {