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POHow to obtain a reference to a Runnable instance passed to a Thread constructor using PowerMock(ito)?
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  1. POHow to obtain a reference to a Runnable instance passed to a Thread constructor using PowerMock(ito)?
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    copied!<p>There's a black box class which creates a <code>Thread</code> using its constructor accepting an instance of <code>Runnable</code> as the argument:</p> <pre><code>public class Service { public static Task implements Runnable { @Override public void run() { doSomeHeavyProcessing(); } } public void doAsynchronously() { new Thread(new Task()).start(); } } </code></pre> <p>I want to intercept the constructor call and get a reference to the passing <code>Task</code> implementing <code>Runnable</code>. This is the code so far:</p> <pre><code>@RunWith(PowerMockRunner.class) @PrepareForTest(Service.class) public class ServiceTest { @Test public void testService() { ArgumentCaptor&lt;Runnable&gt; runnables = ArgumentCaptor.forClass(Runnable.class); Thread thread = Mockito.mock(Trhead.class); whenNew(Thread.class.getContructor(Runnable.class)). withArguments(runnables.capture)).thenReturn(thread); new Service().doAsynchronously(); System.out.println("all runnables: " + runnables.getAllValues()); for (Runnable r : runnables.getAllValues()) r.run(); // perform some assertions after the code meant to be executed in a new // thread has been executed in the current (main) thread } } </code></pre> <p>Test execution will print out:</p> <pre><code>all runnables: [] </code></pre> <p>Is there a way of grabbing a reference to all <code>Runnable</code> objects or <code>Thread</code> objects returned by the constructor? I want to execute the asynchronous code either in the current (main) thread or join created threads and perform assertions.</p>
 

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