human
I wrote the below code

    global called
    class PySubType1(type, ):
        pass
    class PySubType2(PySubType1, ):
        pass
    class PySubType3(PySubType2, PySubType1, ):
        pass
    for x in [bool, buffer, type(range), type(''.index), type(BaseException), dict, type(Ellipsis), file, float, type(sys._getframe(0)), xrange, int, long, unicode, tuple, type((lambda : 3)), type(None), type(object.__str__), PySubType1, PySubType2, PySubType3]:
        called = False
        class MyType(type, ):
            def __clrtype__(self):
                global called
                called = True
                return x
        class X(object, ):
            __metaclass__ = MyType
        AreEqual(called, True)

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

def test_clrtype_returns_existing_python_types():