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copied!<p>I think that you can use any testing framework you like.</p> <p>The thing is that you have to execute user actions in one test method asynchronously an synchronize them at some point.</p> <p>The approach I would recommend you is it to use <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ExecutorService.html" rel="nofollow">ExecutorService</a> framework from <code>java.util.concurrent</code> package.</p> <p>So first of all you have to create the executor</p> <pre><code>ExecutorService executorService = Executors.newFixedThreadPool(2); </code></pre> <p>Next use executor to asynchronously run tasks using <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ExecutorService.html#submit%28java.lang.Runnable%29" rel="nofollow">submit</a> method and synchronize actions using <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/Future.html#get%28%29" rel="nofollow">get</a> method.</p> <p>See code example below</p> <pre><code>@Test public void test() throws Exception { final User firstUser = new User(); Future<?> firstUserAction = executorService.submit(new Runnable() { @Override public void run() { firstUser.doSomething(); firstUser.doSomethingElse(); } }); final User secondUser = new User(); Future<?> secondUserAction = executorService.submit(new Runnable() { @Override public void run() { secondUser.doSomething(); } }); // synchronization firstUserAction.get(); secondUserAction.get(); // synchronized now secondUserAction = executorService.submit(new Runnable() { @Override public void run() { secondUser.doSomethingElse(); } }); } </code></pre>

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