def METHOD_NAME(capfd, piker_dir, ex_watchlists, tickers):
    """Verify that single or multi-ticker lists can be added.
    """
    for ticker in tickers:
        ex_watchlists['pharma'].append(ticker)
    run(f"piker watchlists -d {piker_dir} add pharma {' '.join(tickers)}")
    out = wl.ensure_watchlists(piker_dir)
    assert out == ex_watchlists