test_six.py 文件源码

def test_with_metaclass():
    class Meta(type):
        pass
    class X(six.with_metaclass(Meta)):
        pass
    assert type(X) is Meta
    assert issubclass(X, object)
    class Base(object):
        pass
    class X(six.with_metaclass(Meta, Base)):
        pass
    assert type(X) is Meta
    assert issubclass(X, Base)
    class Base2(object):
        pass
    class X(six.with_metaclass(Meta, Base, Base2)):
        pass
    assert type(X) is Meta
    assert issubclass(X, Base)
    assert issubclass(X, Base2)
    assert X.__mro__ == (X, Base, Base2, object)
    class X(six.with_metaclass(Meta)):
        pass
    class MetaSub(Meta):
        pass
    class Y(six.with_metaclass(MetaSub, X)):
        pass
    assert type(Y) is MetaSub
    assert Y.__mro__ == (Y, X, object)