为SNMP服务器和客户端实施JUNIT测试

Question

我找到了SNMP服务器和SNMP客户端的很好的示例，但我不确定如何将JUNIT测试实现到单个测试文件中：

public class SNMPClientTest
{
    @Test
    public void randomData()
    {
        SnmpTrap trap = new SnmpTrap("127.0.0.1",
            "1.3.6.1.4.1.2789.2005.1={s}WWW Server Has Been Restarted",
            2, "kschmidt", "MD5", "mysecretpass", "DES", "mypassphrase");
        trap.doTrap();
    }
}

public class SNMPServerTest
{
    @Test
    public void randomDatabaseData() throws SQLException, FileNotFoundException, IOException
    {
        V3TrapReceiver v3 = new V3TrapReceiver("127.0.0.1", "kschmidt", "MD5",
            "mysecretpass", "DES", "mypassphrase");
        v3.listen();
    }
}

运行服务器时，我会收到消息Waiting for traps..，并且无法继续Junit测试。但是我可以将它们运到2个单独的文件中。

我如何解决这个问题？您可以在此处找到完整的源代码：http：//pastebin.com/zketxqmq

Answer 1

如果要同时在同一测试中运行客户端和服务器，则可以考虑在单个测试中启动它们为单独的线程。

我通常会尝试避免这种情况，因为它确实为测试增加了一些复杂性和上下文管理。

请注意：

• 该样本尚未测试，可能需要进行调整。处理其他线程的要旨应大约正确。

• 我没有为您的测试验证任何内容，因此所有这些都是运行服务器，然后是未期望输出或状态的客户端。

  @Rule
  public ErrorCollector collector = new ErrorCollector();
  @Rule
  public Timeout testTimeout = new Timeout(15, TimeUnit.SECONDS);
  @Test
  public void testServerClientCommunication throws Exception () {
      final SnmpTrap trap = new SnmpTrap("127.0.0.1",
              "1.3.6.1.4.1.2789.2005.1={s}WWW Server Has Been Restarted",
              2, "kschmidt", "MD5", "mysecretpass", "DES", "mypassphrase");
      final V3TrapReceiver v3 = new V3TrapReceiver("127.0.0.1", "kschmidt", "MD5",
              "mysecretpass", "DES", "mypassphrase");
      Runnable serverTask = new Runnable() {
          @Override
          public void run() {
              try {
                  while (!Thread.currentThread().isInterrupted()) {
                      v3.listen();
                  }
              } catch (Throwable th) {
                  //Exceptions thrown outside of the main Junit execution won't get propagated back to fail the test
                  //Use the ErrorCollector to maintain awareness
                  collector.addError(th);
              }
          }};
          //Create the Thread to handle the Server execution
          final Thread serverExecutor = new Thread(serverTask, "SNMP Server");
      /*
       * Create the client task and thread.
       */
      Runnable clientTask = new Runnable() {
          @Override
          public void run() {
              try {
                boolean clientIsDone = false;
                while (!clientIsDone) {
                      trap.doTrap();
                      //FIXME: Determine the state that matters.
                      clientIsDone = true;
                }
              } catch (Throwable th) {
                  //Exceptions thrown outside of the main Junit execution won't get propagated back to fail the test
                  //Use the ErrorCollector to maintain awareness
                  collector.addError(th);
              } 
          }};
  
          Thread clientExecutor = new Thread(clientTask, "SNMP Client");
          /*
           * Start the server first
           */
          //Don't hold the JVM if the server is not done.
          serverExecutor.setDaemon(true); 
          serverExecutor.start();
              /*
               * Now start the client.  Note that after the client traps successfully that it will interrupt the server thread.
               * The intent is that the interrupt will allow the server thread to die gracefully
               */
          clientExecutor.setDaemon(true);
          clientExecutor.start();
          //Since we off-threaded the tasks the test will consider itself 'done' unless we join with the client, which basically says
          //"Hold the current thread at this point until the other thread completes."
          clientExecutor.join();
  }
  

Answer 2

以@beforeclass注释的方法启动服务器。这将在调用其他测试之前运行。