oeqa/core/decorator/__init__.py: set metaclass to ABCMeta

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>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/meta/lib/oeqa/core/decorator/__init__.py b/meta/lib/oeqa/core/decorator/__init__.py
index 855b6b9d28..6ca0acf353 100644
--- a/meta/lib/oeqa/core/decorator/__init__.py
+++ b/meta/lib/oeqa/core/decorator/__init__.py
@@ -2,7 +2,7 @@
 # Released under the MIT license (see COPYING.MIT)
 
 from functools import wraps
-from abc import abstractmethod
+from abc import abstractmethod, ABCMeta
 
 decoratorClasses = set()
 
@@ -10,7 +10,7 @@ def registerDecorator(obj):
     decoratorClasses.add(obj)
     return obj
 
-class OETestDecorator(object):
+class OETestDecorator(object, metaclass=ABCMeta):
     case = None # Reference of OETestCase decorated
     attrs = None # Attributes to be loaded by decorator implementation