code: def test_3x4(self):
      grid1 = [
          ["0", "E", "0", "0"],
          ["E", "0", "W", "E"],
          ["0", "E", "0", "0"],
      ]
      self.assertEqual(3, max_killed_enemies(grid1))
  
file_path: keon-algos/algorithms/matrix/bomb_enemy.py
imports: import unittest
label_desc: Use image node_id 1 for calling the TestBombEnemy obj's underlying member method code with example usage: obj.test_3x4() without return types