Optional/suggestion:  Since this method doesn't depend at all on the instance-state (i.e. ``self``), you can decorate it with ``@staticmethod``.  This is beneficial because it supports growth and mobility of the behaviour, for example some day we could move the method somewhere else, like into the API w/o it affecting any test code (since it's not state dependent).  It also helps protect the generalized/independent behaviour by failing if someone later tries to add  a 'self.sometihng' reference in it.