code: def testAddInteractiveMode(self):
      t = trace.FireTrace("initial object")
      t.AddInteractiveMode()
      self.assertEqual(
          str(t), "1. Initial component\n2. Entered interactive mode"
      )
  
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 9 for calling the FireTraceTest obj's underlying member method code with example usage: obj.testAddInteractiveMode() without return types