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    <p>There are two ways to get blocks dispatched to the main queue to run. The first is via <code>dispatch_main</code>, as mentioned by Drewsmits. However, as he also noted, there's a big problem with using <code>dispatch_main</code> in your test: <strong>it never returns</strong>. It will just sit there waiting to run any blocks that come its way for the rest of eternity. That's not so helpful for a unit test, as you can imagine.</p> <p>Luckily, there's another option. In the <code>COMPATIBILITY</code> section of the <a href="https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man3/dispatch_main.3.html" rel="nofollow"><code>dispatch_main</code> man page</a>, it says this:</p> <blockquote> <p>Cocoa applications need not call dispatch_main(). Blocks submitted to the main queue will be executed as part of the "common modes" of the application's main NSRunLoop or CFRunLoop.</p> </blockquote> <p>In other words, if you're in a Cocoa app, the dispatch queue is drained by the main thread's <code>NSRunLoop</code>. So all we need to do is keep the run loop running while we're waiting for the test to finish. It looks like this:</p> <pre><code>- (void)testDoSomething { __block BOOL hasCalledBack = NO; void (^completionBlock)(void) = ^(void){ NSLog(@"Completion Block!"); hasCalledBack = YES; }; [MyObject doSomethingAsyncThenRunCompletionBlockOnMainQueue:completionBlock]; // Repeatedly process events in the run loop until we see the callback run. // This code will wait for up to 10 seconds for something to come through // on the main queue before it times out. If your tests need longer than // that, bump up the time limit. Giving it a timeout like this means your // tests won't hang indefinitely. // -[NSRunLoop runMode:beforeDate:] always processes exactly one event or // returns after timing out. NSDate *loopUntil = [NSDate dateWithTimeIntervalSinceNow:10]; while (hasCalledBack == NO &amp;&amp; [loopUntil timeIntervalSinceNow] &gt; 0) { [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:loopUntil]; } if (!hasCalledBack) { STFail(@"I know this will fail, thanks"); } } </code></pre>
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    1. COOnce again, thanks for taking the time to answer! This looks like a pretty good pattern for OCUnit async testing.
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    2. COamongst my google searches, this was by far the best and easiest to implement solution for asynchronous testing that i found.
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    3. COYou should check that hasCalledBack == NO before failing right? Or is that while() loop supposed to return somehow when if works.
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