surface_test.py 文件源码

def test_convert(self):
        """Ensure method convert() preserves the surface's class

        When Surface is subclassed, the inherited convert() method will return
        instances of the subclass. Non Surface fields are omitted, however.
        This includes instance attributes.
        """
        pygame.display.init()
        try:
            ms1 = self.MySurface((32, 32), 0, 24)
            ms2 = ms1.convert(24)
            self.assertTrue(ms2 is not ms1)
            self.assertTrue(isinstance(ms2, self.MySurface))
            self.assertTrue(ms1.an_attribute)
            self.assertRaises(AttributeError, getattr, ms2, "an_attribute")
        finally:
            pygame.display.quit()