def METHOD_NAME(self):
    # Regular lat/lon (Plate Carree).
    x_points = np.arange(3)
    y_points = np.arange(3)
    coord_units = 'degrees'
    cs = self.ellipsoid
    test_cube = self._make_test_cube(cs, x_points, y_points, coord_units)
    grid_definition_section(test_cube, self.mock_grib)
    self._check_key('gridDefinitionTemplateNumber', 0)