如何用Java中的junit编写针对void方法的测试，尤其是它们不返回值？

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我这里有一个简单的程序来将主机名解析为ip地址，反之亦然，并且没有任何想法，只要它们不返回任何值，如何使用junit测试这两个void方法。 我需要有关junit test的帮助，因为我的void方法不会返回任何东西。


    /*
 * inside this interface we have two function,that 
 * resolve ip to host-addr and vice versa
 */
public interface DnsFunctions {

    public void resolveHostToIp();

    public void resolveIpToHost();
}

这是Dns解析器的主要代码，其中在switch实例内调用void方法：


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class DnsResolver implements DnsFunctions {

    static BufferedReader br;
    static DnsFunctions df = new DnsResolver();
    static boolean status = true;

    public static void main(String[] args) throws NumberFormatException, IOException {

        StringBuilder sb = new StringBuilder();
        sb.append("Welcome to DNS-resolver page :");
        sb.append("\n*select (1) to resolve Hostname to IP-Address");
        sb.append("\n*select (2) to get the Host name from inputed IP-Address");
        sb.append("\n*select (3) for EXIT");

        System.out.println(sb);

        /*
         * depending on the inputted value from user /1-2 or 3/ the suitable function
         * will be called
         */

        while (status) {
            br = new BufferedReader(new InputStreamReader(System.in));

            int inputedValue = Integer.parseInt(br.readLine());

            switch (inputedValue) {

            case 1:

                df.resolveHostToIp();
                status = true;
                break;

            case 2:
                df.resolveIpToHost();
                status = true;
                break;

            case 3:
                status = false;
                System.out.println("GoodBye :)");
                break;

            }
        }

    }

    @Override
    /*
     * 
     * @parameter value
     */
    public void resolveHostToIp() {
        try {
            System.out.println("\n Enter Hostname:");
            String hostName = br.readLine();

            InetAddress address = InetAddress.getByName(hostName);
            System.out.println("Hostname :" + address.getHostName());
            System.out.println("IP:" + address.getHostAddress());
        } catch (Exception e) {
            System.out.println("ERROR :(" + e.getMessage());
        }

    }

    @Override
    /*
     * @parameter value
     */
    public void resolveIpToHost() {
        try {
            System.out.println("\n Enter IP address");
            String ip_add = br.readLine();
            InetAddress ia = InetAddress.getByName(ip_add);
            System.out.println("IP: " + ip_add);
            System.out.println("Host Name: " + ia.getHostName());
        } catch (IOException e) {
            System.out.println("ERROR :(" + e.getMessage());
        }

    }

}
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