code: def testDeepDictFishScript(self):
      deepdict = {"level1": {"level2": {"level3": {"level4": {}}}}}
      script = completion.Script("deepdict", deepdict, shell="fish")
      self.assertIn("level1", script)
      self.assertIn("level2", script)
      self.assertIn("level3", script)
      self.assertNotIn("level4", script)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from fire import completion
  from fire import test_components
  from fire import testutils
label_desc: Use image node_id 11 for calling the TabCompletionTest obj's underlying member method code with example usage: obj.testDeepDictFishScript() without return types