new_contents: from __future__ import absolute_import, division
  import logging
  import mock
  import workflows.logging
  
  def test_callback_handler_works_within_logging_framework():
    cbmock = mock.Mock()
    logmsg = 'Test message for callback'
    log = logging.getLogger('workflows.tests.logging.callback')
    log.setLevel(logging.INFO)
  
    cbh = workflows.logging.CallbackHandler(cbmock)
    log.addHandler(workflows.logging.CallbackHandler(cbmock))
    log.info(logmsg)
  
    cbmock.assert_called_once()
    assert cbmock.call_args == ((mock.ANY,), {})
    logrec = cbmock.call_args[0][0]
    assert isinstance(logrec, logging.LogRecord)
    assert logrec.name      == 'workflows.tests.logging.callback'
    assert logrec.levelname == 'INFO'
    assert logrec.message   == logmsg
    assert logrec.funcName.startswith('test_')
  
subject: Add test for logging callback handler