How to kill a JUnit test run in Eclipse that has entered an infinte loop

Question

I have some Java code that I am unit testing using JUnit, running inside Eclipse (Neon). It so happens that some code under test has a bug in it, causing it to enter an infinite loop. The JUnit run then, of course, does not finish. How do I kill the test run?

The button for stopping the test run ("Stop JUnit Test Run") does not work well: the GUI seems to think that it has stopped the test run, but a look at the CPU activity (using top, for example), shows that a Java thread is still running. I can kill the thread myself by sending it a kill signal. But that seems a kludge and is inconvenient. Is there a better way, available within Eclipse itself?

Answer 1

Kill it from the console view, using the red button. This stops the process.

Stopping it from the junit view only asks it to stop.

Answer 2

You can handle such things with JUnit by specifying a time-out within the @Test annotation. For example:

// Simple test-case which will always fail with time-out
@Test(timeout = 1000 * 60) throws Exception // 60 seconds 
public void testSomething() {
    for (int i = 0; i < 100; i++) {  // 100 seconds
        Thread.sleep(1000);
    }
}

If your test method doesn't finish on time, then JUnit will interrupt it and report a test failure. For the example above it will be:

java.lang.Exception: test timed out after 60000 milliseconds
    at java.lang.Thread.sleep(Native Method)
    at my.package.Test1.testSomething(Test1.java:12)