Allow assertions after expected System.exit()

[raphinesse]

Currently this code passes:

@Test
public void failTest() {
    exit.expectSystemExit();
    System.exit(0)
    assertTrue(false);
}

I don't know if this is possible but it would be nice if it would fail instead. This would allow to assert that an appropriate error message was sent to System.err for example.

[stefanbirkner]

At the moment I only know one solution for your problem. You have to write an own rule for the assertion and use RuleChain in order to get its finished method executed after the ExpectedSystemExit rule. Here is an example:

public class Exiter {
    String message = "";

    public void doExit() {
        message = "call exit";
        System.exit(0);
    }
}

public class ExiterTest {
    public ExpectedSystemExit exit = ExpectedSystemExit.none();
    public CheckMessage checkMessage = new CheckMessage();

    @Rule
    public TestRule allRules = RuleChain.outerRule(checkMessage).around(exit);

    @Test
    public void writesMessage() {
        exit.expectSystemExit();
        Exiter exiter = new Exiter();
        checkMessage.exiter = exiter;
        exiter.doExit();
    }

    private static final class CheckMessage extends TestWatcher {
        Exiter exiter;

        @Override
        protected void finished(Description description) {
            assertEquals("call exit", exiter.message);
        }
    }
}

[raphinesse]

Thank you for your quick response. I'll give it a try when I find some time to continue working on that particular project.

[raphinesse]

Nice one :+1: