def METHOD_NAME(self) -> None:
    """
    L{FileLogObserver} is an L{ILogObserver}.
    """
    with StringIO() as fileHandle:
        observer = FileLogObserver(fileHandle, lambda e: str(e))
        try:
            verifyObject(ILogObserver, observer)
        except BrokenMethodImplementation as e:
            self.fail(e)