def METHOD_NAME(self):
    method = agg.AffineMatrix.flip_y
    orig = array((1.0, 2.0, 3.0, 1.0, 4.0, 5.0))
    desired = array([1.0, 2.0, -3.0, -1.0, 4.0, -5.0])
    self._test_zero_arg_transform(method, orig, desired)