def METHOD_NAME(self):
    for axis in self.axes:
        result = relevel(
            self.cube, self.src_levels, [-1, 0, 5.5], axis=axis
        )
        assert_array_equal(
            result.data.flatten(), np.array([np.nan, 0, 55])
        )
        expected = DimCoord([-1, 0, 5.5], units=1, long_name="thingness")
        self.assertEqual(expected, result.coord("thingness"))