code: def expect_equal(first, second, msg=None, extras=None):
      
      try:
          asserts.assert_equal(first, second, msg, extras)
      except signals.TestSignal as e:
          logging.exception('Expected %s equals to %s, but they are not.', first,
                            second)
          recorder.add_error(e)
docs: Expects the equality of objects, otherwise fail the test.
  
      If the expectation is not met, the test is marked as fail after its
      execution finishes.
  
      Error message is "first != second" by default. Additional explanation can
      be supplied in the message.
  
      Args:
          first: The first object to compare.
          second: The second object to compare.
          msg: A string that adds additional info about the failure.
          extras: An optional field for extra information to be included in test
              result.