JUnit で「System.exit()」を呼び出すメソッドをテストする方法

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 {
        @Override
        public void checkExit(int status) {
            super.checkExit(status);
            throw new ExitException(status);
        }
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        System.setSecurityManager(new NoExitSecurityManager());
    }

    @Override
    protected void tearDown() throws Exception {
        System.setSecurityManager(null);
        super.tearDown();
    }

    public void testExit() throws Exception {
        try {
            System.exit(42);
        } catch (ExitException e) {
            assertEquals("Exit status", 42, e.status);
        }
    }
}