code: def testDictCompletions(self):
      colors = {
          "red": "green",
          "blue": "yellow",
          "_rainbow": True,
      }
      completions = completion.Completions(colors)
      self.assertIn("red", completions)
      self.assertIn("blue", completions)
      self.assertNotIn("green", completions)
      self.assertNotIn("yellow", completions)
      self.assertNotIn("_rainbow", completions)
      self.assertNotIn("True", completions)
      self.assertNotIn(True, 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 5 for calling the TabCompletionTest obj's underlying member method code with example usage: obj.testDictCompletions() without return types