backend_tests.py 文件源码

def test_opaque_enum(self):
        ffi = FFI(backend=self.Backend())
        ffi.cdef("enum foo;")
        from cffi import __version_info__
        if __version_info__ < (1, 6):
            py.test.skip("re-enable me in version 1.6")
        e = py.test.raises(CDefError, ffi.cast, "enum foo", -1)
        assert str(e.value) == (
            "'enum foo' has no values explicitly defined: refusing to guess "
            "which integer type it is meant to be (unsigned/signed, int/long)")