Question

It seems that runClasses() doesn’t terminate the code being tested even after the test times out and fails.

An SSCCE:

import org.junit.Test;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;

class Main {
    public static void main(String[] args) {
        Class<?>[] classes = { PublicTest.class };
        Result result = JUnitCore.runClasses(classes);
        System.out.println("Num tests: " + result.getRunCount());
        System.out.println("Time: " + result.getRunTime());
        System.out.println("Failure: " + result.getFailures().get(0));
    }
}

Test class:

import org.junit.Test;

public class PublicTest {
    @Test(timeout=10)
    public void loop() {
        while(true) {}
    }
}

How do I get the code to terminate?

Answer 1

JUnitCore at some point indeed does create a new thread that is never finishing. The main() implementation of JUnit avoids getting stuck by calling System.exit() when it has completed its work. That seems a little untidy to me, but might be the best solution for you.