def METHOD_NAME():
    """Create simple Surfaces instance."""
    logger.info("Simple case...")
    top = xtgeo.surface_from_file(TESTSET1A)
    base = xtgeo.surface_from_file(TESTSET1B)
    surfs = xtgeo.Surfaces()
    surfs.surfaces = [top, base]
    surfs.describe()
    assert isinstance(surfs.surfaces[0], xtgeo.RegularSurface)
    assert isinstance(surfs, xtgeo.Surfaces)