code: def testAddCompletionScript(self):
      t = trace.FireTrace("initial object")
      t.AddCompletionScript("This is the completion script string.")
      self.assertEqual(
          str(t), "1. Initial component\n2. Generated completion script"
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from fire import testutils
  from fire import trace
label_desc: Use image node_id 8 for calling the FireTraceTest obj's underlying member method code with example usage: obj.testAddCompletionScript() without return types