old_contents: from board import Board
  
  """
  Tests that board matrix is correct size and
  that columns and rows are the correct values
  when initially constructed. Also tests that
  all elements are zero.
  """
  def test_constructor():
      board = Board(0,0)
      assert board.boardMatrix.size == 0
      assert board.columns == 0
      assert board.rows == 0
  
      board = Board(5,5)
      assert board.boardMatrix.size == 25
      assert board.columns == 5
      assert board.rows == 5
  
      for x in range(board.columns):
          for y in range(board.rows):
              assert board.boardMatrix.item((x,y)) == 0
  
  """
  Tests that one can add pieces to the board and 
  that the stack correctly.
  """
  def test_addPiece():
      board = Board(5,5)
      assert board.addPiece(0, 1) == True
      assert board.boardMatrix.item((4,0)) == 1
  
      assert board.addPiece(0, 2) == True
      assert board.boardMatrix.item((3,0)) == 2
      assert board.boardMatrix.item((4,0)) == 1
  
      assert board.addPiece(1, 1) == True
      assert board.boardMatrix.item((4,1)) == 1
  
      assert board.addPiece(4, 1) == True
      assert board.boardMatrix.item((4,4)) == 1
  
  """
  Tests that the board can be filled up completely 
  but no more.
  """
  def test_addPieceMaxColumn():
      board = Board(5,5)
  
      # Fill board
      for x in range(board.columns):
          for y in range(board.rows):
              assert board.addPiece(x, 1) == True
  
      # Attempt to overfill
      for x in range(board.columns):
          assert board.addPiece(x, 2) == False
  
      # Make sure initially filled values weren't overriden
      for x in range(board.columns):
          for y in range(board.rows):
              assert board.boardMatrix.item((x,y)) == 1
  
new_contents: from board import Board
  
  """
  Tests that board matrix is correct size and
  that columns and rows are the correct values
  when initially constructed. Also tests that
  all elements are zero.
  """
  def test_constructor():
      board = Board(0,0)
      assert board.boardMatrix.size == 0
      assert board.columns == 0
      assert board.rows == 0
  
      board = Board(5,5)
      assert board.boardMatrix.size == 25
      assert board.columns == 5
      assert board.rows == 5
  
      for x in range(board.columns):
          for y in range(board.rows):
              assert board.boardMatrix.item((x,y)) == 0
  
  """
  Tests that one can add pieces to the board and 
  that the stack correctly.
  """
  def test_addPiece():
      board = Board(5,5)
      assert board.addPiece(0, 1) == True
      assert board.boardMatrix.item((4,0)) == 1
  
      assert board.addPiece(0, 2) == True
      assert board.boardMatrix.item((3,0)) == 2
      assert board.boardMatrix.item((4,0)) == 1
  
      assert board.addPiece(0, 2) == True
      assert boart.boardMatrix.item((2,0)) == 2
      assert board.boardMatrix.item((3,0)) == 2
      assert board.boardMatrix.item((4,0)) == 1
  
      assert board.addPiece(1, 1) == True
      assert board.boardMatrix.item((4,1)) == 1
  
      assert board.addPiece(4, 1) == True
      assert board.boardMatrix.item((4,4)) == 1
  
  """
  Tests that the board can be filled up completely 
  but no more.
  """
  def test_addPieceMaxColumn():
      board = Board(5,5)
  
      # Fill board
      for x in range(board.columns):
          for y in range(board.rows):
              assert board.addPiece(x, 1) == True
  
      # Attempt to overfill
      for x in range(board.columns):
          assert board.addPiece(x, 2) == False
  
      # Make sure initially filled values weren't overriden
      for x in range(board.columns):
          for y in range(board.rows):
              assert board.boardMatrix.item((x,y)) == 1
  
subject: Add to test_addPiece(). Discover bug.