code: def testClassScript(self):
      script = completion.Script("", tc.MixedDefaults)
      self.assertIn("ten", script)
      self.assertIn("sum", script)
      self.assertIn("identity", script)
      self.assertIn("--alpha", script)
      self.assertIn("--beta", 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 10 for calling the TabCompletionTest obj's underlying member method code with example usage: obj.testClassScript() without return types