code: def testGetHandlerHome(self):
      flags_dict = {
          labels.ENGINE_FLAG: "engine",
          labels.PIPELINE_DSL_PATH: "path_to_pipeline_dsl",
      }
      handler = FakeHandler(flags_dict)
      self.assertEqual(
          os.path.join(os.environ["HOME"], "tfx", "engine", ""),
          handler._get_handler_home(),
      )
  
imports: import os
  import textwrap
  import tensorflow
  from tfx.dsl.io import fileio
  from tfx.tools.cli import labels
  from tfx.tools.cli.handler import base_handler
label_desc: Use image node_id 4 for calling the BaseHandlerTest obj's underlying member method code with example usage: obj.testGetHandlerHome() without return types