def test_IsAnObserver(self): assert ILogObserver.implementedBy(JSONLogObserverWrapper)
def test_isLogObserver(self): assert ILogObserver.providedBy(plainJSONStdOutLogger())
def test_isLogObserver(self): assert ILogObserver.providedBy(PlainFileLogObserver(StringIO()))
def test_isLogObserver(self, sio): assert ILogObserver.providedBy(PlainFileLogObserver(sio))