def METHOD_NAME(salt_cli, proxy_ids):
    """
    Ensure the proxy can ping (all proxy minions)
    """
    ret = salt_cli.run("-L", "pkg.remove", "coreutils", minion_tgt=",".join(proxy_ids))
    for _id in proxy_ids:
        assert "coreutils" not in ret.data[_id]
    # reinstall
    salt_cli.run("-L", "pkg.install", "coreutils", minion_tgt=",".join(proxy_ids))