Pattern for unit testing async queue that calls main queue on completion

Question

This is related to my previous question, but different enough that I figured I\'d throw it into a new one. I have some code that runs async on a custom queue, then executes

Answer 1

An alternate method, using semaphores and runloop churning. Note that dispatch_semaphore_wait returns nonzero if it times out.

- (void)testFetchSources
{
    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);

    [MyObject doSomethingAsynchronousWhenDone:^(BOOL success) {
        STAssertTrue(success, @"Failed to do the thing!");
        dispatch_semaphore_signal(semaphore);
    }];

    while (dispatch_semaphore_wait(semaphore, DISPATCH_TIME_NOW))
        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
                                 beforeDate:[NSDate dateWithTimeIntervalSinceNow:10]];

    dispatch_release(semaphore);
}