new_contents: """ Testing tripwire module.
  """
  
  from ..tripwire import TripWire, is_tripwire, TripWireError
  
  from nose import SkipTest
  from nose.tools import (assert_true, assert_false, assert_raises,
                          assert_equal, assert_not_equal)
  
  
  def test_is_tripwire():
      assert_false(is_tripwire(object()))
      assert_true(is_tripwire(TripWire('some message')))
  
  
  def test_tripwire():
      # Test tripwire object
      silly_module_name = TripWire('We do not have silly_module_name')
      assert_raises(TripWireError,
                    getattr,
                    silly_module_name,
                    'do_silly_thing')
      # Check AttributeError can be checked too
      try:
          silly_module_name.__wrapped__
      except TripWireError as err:
          assert_true(isinstance(err, AttributeError))
      else:
          raise RuntimeError("No error raised, but expected")
  
subject: Add a test for TripWire.