def site_config_repeatable_only(basic_site_config):
    """Returns an example site config with a repeatable config item as the only item in 'collections'"""
    site_config = basic_site_config.copy()
    config_item = site_config["collections"][0]
    assert (
        "folder" in config_item
    ), "Expected collections.0 to be a repeatable config item"
    return {**site_config, "collections": [config_item]}