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OETestFilter is a subclass of OETestDecorator. It wants to make use of @abstractmethod decorator. But such decorator requires metaclass to be ABCMeta to have effect. So add it now to achieve the designed behaviour. Comments from python's manual: """ Using this decorator requires that the class's metaclass is ABCMeta or is derived from it. """ (From OE-Core rev: 28c4fafb2322ea8c37bcd7710f22f46ef552a902) Signed-off-by: Chen Qi <Qi.Chen@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>