def METHOD_NAME():
    """Test `merge_cube_attributes` with 1 cube."""
    cubes = CubeList([deepcopy(CUBES[0])])
    expected_attributes = deepcopy(cubes[0].attributes)
    merge_cube_attributes(cubes)
    assert len(cubes) == 1
    assert_attribues_equal(cubes[0].attributes, expected_attributes)