def test_empty_config(self, compressor_class, fake_compression):
        """
        For an empty config, the compression graph passes should do nothing
        """
        config = cto.coreml.OptimizationConfig()
        compressor = compressor_class(
            config=config, fake_compression=fake_compression
        )
        prog = self._get_test_program()
        compressor.apply(prog)
        expected_ops = ["conv", "reshape", "linear", "reshape", "conv_transpose"]
        assert get_op_types_in_program(prog) == expected_ops

        For an empty config, the compression graph passes should do nothing
        
coremltools/test/optimize/coreml/test_passes.py