code: def testClassCompletions(self):
      completions = completion.Completions(tc.NoDefaults)
      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 16 for calling the TabCompletionTest obj's underlying member method code with example usage: obj.testClassCompletions() without return types