单元测试代码比产品代码还要多?

package test.java.com;
 
 import main.java.com.Client;
 import main.java.com.Message;
 import main.java.com.RaceResultsService;
 import org.junit.Before;
 import org.junit.Test;
 
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 
 /**
 * Created by ScalaMind on 2015/3/3.
  */
 public class RaceResultsServiceTest {
 
 private RaceResultsServiceraceResults;
 private Messagemessage;
 private ClientclientA;
 private ClientclientB;
 
 @Before
 public void setUp() {
 raceResults = new RaceResultsService();
  message = mock(Message.class);
 clientA = mock(Client.class, "clientA");
 clientB = mock(Client.class, "clientB");
 }
 
 // zero subscribers
 @Test
 public void notSubscribeClientShouldNotReceiveMessage() {
 raceResults.send(message);
 
 verify(clientA, never()).receive(message);
 verify(clientB, never()).receive(message);
 
 }
 
 // one subscriber
 @Test
 public void subscribedClientShouldReceiveMessage() {
 raceResults.addSubscriber(clientA);
 raceResults.send(message);
 
 verify(clientA).receive(message);
 }
 
 // two subscribers
 @Test
 public void messageShouldBeSentToAllSubscribedClients() {
 RaceResultsService raceResults= new RaceResultsService();
 Message message = mock(Message.class);
 
 raceResults.addSubscriber(clientA);
 raceResults.addSubscriber(clientB);
 raceResults.send(message);
 
 verify(clientA).receive(message);
 verify(clientB).receive(message);
 
 }
 
 // subscribe more than once
 @Test
 public void shouldSendOnlyOneMessageToMultiSubscriber() {
 raceResults.addSubscriber(clientA);
 raceResults.addSubscriber(clientA);
 raceResults.send(message);
 verify(clientA).receive(message);
 }
 
 // remove a subscriber
 @Test
 public void unsubscribedClientShouldNotReceiveMessages() {
 raceResults.addSubscriber(clientA);
 raceResults.removeSubscriber(clientA);
 
 raceResults.send(message);
 verify(clientA, never()).receive(message);
 
 }
 
 }

package main.java.com;
 
 import java.util.Collection;
 import java.util.HashSet;
 
 /**
 * Created by ScalaMind on 2015/3/3.
  */
 public class RaceResultsService {
 
 private Collection<Client> clients =  new HashSet<Client>();
 
 public void addSubscriber(Client client) {
 
 clients.add(client);
 }
 
 public void send(Message message) {
 for (Client client :  clients)
 client.receive(message);
 }
 
 public void removeSubscriber(Client client) {
 clients.remove(client);
 }
 }