def METHOD_NAME(self):
    """Test the new attribute is added to the cube when seapoints
       included."""
    result = _make_mask_cube(
        self.mask,
        self.coords,
        [self.lower, self.upper],
        self.units,
        sea_points_included="True",
    )
    self.assertEqual(
        result.attributes["topographic_zones_include_seapoints"], "True"
    )