Callbacks in event loops are untestable

[Matt Jones]

If you look at bug #864406, you can see that there is no way for callbacks to throw exceptions, thereby failing tests in the test runner. Instead the callbacks are run outside the test runner, and crash the program as an unhandled exception.

[Matt Jones (workhorsy)]

unittest {
    describe("thing",
        it("crash test suite", function() {
            set_timeout(function() {
                assert(false);
            }, 0.0f);
        })
    );
}

If you look at this code. You can see that what we need is two things. Firstly a way to flush all events inside the "it" function. Secondly a way to catch any exceptions throw from callbacks, and pass them to the "it" functions.

[Matt Jones (workhorsy)]

Fixed in:
http://bazaar.launchpad.net/~workhorsy/dlanghelper/main/revision/7