test_declarations.py 文件源码

def test_called_twice_from_class(self):
        import warnings
        from zope.interface.declarations import implements
        from zope.interface.interface import InterfaceClass
        from zope.interface._compat import PYTHON3
        IFoo = InterfaceClass("IFoo")
        IBar = InterfaceClass("IBar")
        globs = {'implements': implements, 'IFoo': IFoo, 'IBar': IBar}
        locs = {}
        CODE = "\n".join([
            'class Foo(object):',
            '    implements(IFoo)',
            '    implements(IBar)',
            ])
        with warnings.catch_warnings(record=True) as log:
            warnings.resetwarnings()
            try:
                exec(CODE, globs, locs)
            except TypeError:
                if not PYTHON3:
                    self.assertEqual(len(log), 0) # no longer warn
            else:
                self.fail("Didn't raise TypeError")