@Test public void testNumberOfDoorways() {
		int numDoors = 0;
		int totalCells = board.getNumColumns() * board.getNumRows();
		Assert.assertEquals(625, totalCells);
		for (int r = 0; r < board.getNumRows(); r++) {
			for (int c = 0; c < board.getNumColumns(); c++) {
				BoardCell cell = board.getBoardCell(r,c);
				if (cell.isDoorway()) {
					numDoors++;
				}
			}
		}
		Assert.assertEquals(27, numDoors);
	}