def METHOD_NAME(test):
    test.start_server(
        get_app(dict(merge_duplicate_headers=True)),
        debug=True,
        use_reloader=False,
        use_debugger=True,
        dev_tools_hot_reload=False,
    )
    target = test.table("table")
    wait.until(lambda: target.column(6).get().get_attribute("colspan") == "4", 3)
    assert test.get_logs() == []