code: def test_child_task(self):
      in_parse(
          ["ChildTask"],
          lambda task: self.assertEqual(task.param_a, "config a"),
      )
      in_parse(
          ["ChildTask"],
          lambda task: self.assertEqual(task.param_b, "config b"),
      )
      in_parse(
          ["ChildTask", "--param-a", "command line arg"],
          lambda task: self.assertEqual(
              task.param_a, "command line arg"
          ),
      )
      with self.assertRaises(AttributeError):
          in_parse(["ChildTask"], lambda task: task.param_c)
  
imports: import unittest
  import luigi
  from luigi.cmdline_parser import CmdlineParser
  import gokart
  from gokart.config_params import inherits_config_params
label_desc: Use image node_id 2 for calling the TestInheritsConfigParam obj's underlying member method code with example usage: obj.test_child_task() without return types