Re: JUnit + System.exit(-1): Looking for alternatives

Lasse Reichstein Nielsen <>
Thu, 24 Apr 2008 22:16:54 +0200
Lasse Reichstein Nielsen <> writes:

Try modifying the TestCase to run with a security manager that
prevents calling System.exit, then catch the SecurityException.

Something like (untested!):

And now that it has been tested, it turns out to fail in several ways.

This one seems to work, though:

public class NoExitTestCase extends TestCase {
    protected static class ExitException extends SecurityException {
        public final int status;
        public ExitException(int status) {
            super("There is no escape!");
            this.status = status;
    private static class NoExitSecurityManager extends SecurityManager {
        public void checkPermission(Permission perm) {
            // allow anything.
        public void checkPermission(Permission perm, Object context) {
            // allow anything.
        public void checkExit(int status) {
            throw new ExitException(status);
    protected void setUp() throws Exception {
        System.setSecurityManager(new NoExitSecurityManager());
    protected void tearDown() throws Exception {
        System.setSecurityManager(null); // or save and restore original

    public void testNoExit() throws Exception {
        System.out.println("Printing works");
    public void testExit() throws Exception {
        try {
        } catch (ExitException e) {
            assertEquals("Exit status", 42, e.status);
I'm sure it can be done prettier, but it gives the general idea.

Lasse Reichstein Nielsen -
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