def METHOD_NAME(self):
    section = self.section_3()
    section['Ni'] += 1
    metadata = empty_metadata()
    expected_regex = (
        "X definition inconsistent: .* incompatible with step-size")
    with self.assertRaisesRegex(iris.exceptions.TranslationError,
                                expected_regex):
        grid_definition_template_12(section, metadata)