#!/usr/bin/env python3
# By William Schwartz wkschwartz at gmail dot com


"Demonstrate that the __prepare__ method of a metaclass is implicitly a static method."


import unittest


class TestImplicitStaticMethod(unittest.TestCase):

    def setUp(self):
        class Meta(type):
            def __prepare__(*args, **kwds):
                assert any(isinstance(arg, type) and issubclass(arg, type) for
			   arg in args), "No type subclass passed to __prepare__"
                return {}
        self.Meta = Meta

    @unittest.expectedFailure
    def runTest(self):
        class K(object, metaclass=self.Meta):
            pass


class TestExplicitClassMethod(unittest.TestCase):

    def setUp(self):
        class Meta(type):
            @classmethod
            def __prepare__(*args, **kwds):
                assert any(isinstance(arg, type) and issubclass(arg, type) for
			   arg in args), "No type subclass passed to __prepare__"
                return {}
        self.Meta = Meta

    def runTest(self):
        class K(object, metaclass=self.Meta):
            pass


if __name__ == '__main__':
    unittest.main(verbosity=2)