def METHOD_NAME(self):
    for width in (3, 4, 5, 6):
        array = get_example_kernel(width)
        norm_instance = constraints.radial_constraint()
        normed = norm_instance(backend.variable(array))
        value = backend.eval(normed)
        assert np.all(value.shape == array.shape)
        assert np.all(value[0:, 0, 0, 0] == value[-1:, 0, 0, 0])
        assert len(set(value[..., 0, 0].flatten())) == math.ceil(
            float(width) / 2
        )