code: def testGeneratorCompletions(self):
      def generator():
          x = 0
          while True:
              yield x
              x += 1
  
      completions = completion.Completions(generator())
      self.assertEqual(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 15 for calling the TabCompletionTest obj's underlying member method code with example usage: obj.testGeneratorCompletions() without return types