text: import unittest
  from cell import Cell
  
  
  class TestCase(unittest.TestCase):
  
      def test_cell_has_all_walls_exist(self):
          cell = Cell(1, 5)
          self.assertTrue(hasattr(cell, "has_all_walls"), "Cell should have `has_all_walls` method")
  
      def test_cell_has_all_walls(self):
          cell = Cell(1, 5)
          self.assertTrue(cell.has_all_walls(), "Newly created cell should have all walls")
  
      def test_cell_wall_destroyed(self):
          cell = Cell(1, 5)
          cell.walls['N'] = False
          self.assertFalse(cell.has_all_walls(), "`has_all_walls` method should return false when wall is destroyed")
  