Using echo in jenkins workflow method

using_echo.workflow

HashMap<String,String> cfg
node() {
    echo("test")
    String str = readFile file: '/home/martin/a.config'
    cfg = getConfig(str)
    echo(cfg)
    echo("cfg: "+cfg)
}

@NonCPS HashMap<String,String> getConfig(String text) {
    HashMap<String,String> map = new HashMap<>()
    ConfigObject cfg = new ConfigSlurper().parse(text)
    map.put("a", cfg.a)
    return map
}

echo("cfg: "+cfg)