@Test
    public void checkRowsCleared(){
        b.commit();
        int result = b.place(sRotated, 1, 1);
        b.commit();
        s = new Piece(Piece.STICK_STR);
        assertEquals(Board.PLACE_OK, result);
        result = b.place(s, 0, 1);
        assertEquals(Board.PLACE_ROW_FILLED, result);
        assertEquals(b.clearRows(), 3);
        //b.commit();
        assertEquals(2, b.dropHeight(s, 0));
        b.undo();
        assertEquals(1, b.dropHeight(s, 0));
        b.place(sRotated, 1, 1);
        b.clearRows();
        b.commit();
        assertEquals(0,b.clearRows());      //clear rows after clear rows has already been called
    }

    @Test
    public void testCombinations(){
        Board c = new Board(5,5);
        c.place(new Piece(Piece.L1_STR), 0, 0);
        c.commit();
        assertEquals(1, c.dropHeight(new Piece(Piece.SQUARE_STR), 1));
        c.place(new Piece(Piece.SQUARE_STR), 1, 1);
        assertEquals(0, c.dropHeight(new Piece(Piece.SQUARE_STR), 3));
        c.commit();
        c.place(new Piece(Piece.SQUARE_STR), 3, 0);
        assertEquals(1, c.clearRows());
        c.commit();
        c.place(new Piece(Piece.SQUARE_STR), 3, 1);
        assertEquals(1, c.clearRows());
    }


    //savsedafa
    @Test
    public void testMoreCombinations(){
        Board d = new Board(4,4);
        s = new Piece(Piece.L2_STR);
        sRotated = s.computeNextRotation();
        sRotated = sRotated.computeNextRotation();
        d.place(s, 0, 0);
        d.commit();
        d.place(sRotated, 0, 1);
        d.commit();
        d.place(new Piece(Piece.SQUARE_STR), 2, 0);
        d.commit();
        d.place(new Piece(Piece.SQUARE_STR), 2, 2);
        assertEquals(4, d.clearRows());
    }