code: def testDeepDictCompletions(self):
      deepdict = {"level1": {"level2": {"level3": {"level4": {}}}}}
      completions = completion.Completions(deepdict)
      self.assertIn("level1", completions)
      self.assertNotIn("level2", completions)
  
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 7 for calling the TabCompletionTest obj's underlying member method code with example usage: obj.testDeepDictCompletions() without return types