docstr: Records 'timer' and returns self as callable timer.
docstr_tok: ["Records","'timer","'","and","returns","self","as","callable","timer","."]
code: def wrap_timer(self, timer):
      """Records 'timer' and returns self as callable timer."""
      self.saved_timer = timer
      return self
  
imports: import timeit
  import unittest
  import sys
  import io
  from textwrap import dedent
  from test.support import captured_stdout
  from test.support import captured_stderr
label_desc: Use image node_id 5 for calling the FakeTimer obj's underlying member method code with example usage: obj.wrap_timer(timer) and returns: self