input: Write a python function to test the movement of a Cell object.
  assert test_cell_movement() == (1, 0, 1, 0)
  assert test_cell_movement() == (2, 1, 2, 1)
  assert test_cell_movement() == (3, 2, 3, 2)
output: class Cell:
      def __init__(self):
          self.x = 0
          self.y = 0
  
      def move_right(self):
          self.x += 1
  
      def move_up(self):
          self.y += 1
  
  def test_cell_movement():
      cell = Cell()
      
      cell.move_right()
      assert (cell.x, cell.y) == (1, 0)
      
      cell.move_up()
      assert (cell.x, cell.y) == (1, 1)
      
      cell.move_right()
      assert (cell.x, cell.y) == (2, 1)
      
      cell.move_up()
      assert (cell.x, cell.y) == (2, 2)
      
      cell.move_right()
      assert (cell.x, cell.y) == (3, 2)
      
      cell.move_up()
      assert (cell.x, cell.y) == (3, 3)
      
      return (cell.x, cell.y, cell.x, cell.y)