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    <p>EDIT (2-18-2014): I just stumbled across this article with a more elegant solution.</p> <p><a href="http://www.infinite-loop.dk/blog/2011/04/unittesting-asynchronous-network-access/">http://www.infinite-loop.dk/blog/2011/04/unittesting-asynchronous-network-access/</a></p> <p>Essentially, you have the following method:</p> <pre><code>- (BOOL)waitForCompletion:(NSTimeInterval)timeoutSecs { NSDate *timeoutDate = [NSDate dateWithTimeIntervalSinceNow:timeoutSecs]; do { [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:timeoutDate]; if([timeoutDate timeIntervalSinceNow] &lt; 0.0) break; } while (!done); return done; } </code></pre> <p>At the end of your test method, you make sure things haven't timed out:</p> <pre><code>STAssertTrue([self waitForCompletion:5.0], @"Timeout"); </code></pre> <p>Basic format:</p> <pre><code>- (void)testAsync { // 1. Call method which executes something asynchronously [obj doAsyncOnSuccess:^(id result) { STAssertNotNil(result); done = YES; } onError:^(NSError *error) [ STFail(); done = YES; } // 2. Determine timeout STAssertTrue([self waitForCompletion:5.0], @"Timeout"); } </code></pre> <p>==============</p> <p>I'm late to the party, but I came across a very simple solution. (Many thanks to <a href="http://www.cocoabuilder.com/archive/xcode/247124-asynchronous-unit-testing.html">http://www.cocoabuilder.com/archive/xcode/247124-asynchronous-unit-testing.html</a>)</p> <p>.h file:</p> <pre><code>@property (nonatomic) BOOL isDone; </code></pre> <p>.m file:</p> <pre><code>- (void)testAsynchronousMethod { // 1. call method which executes something asynchronously. // 2. let the run loop do its thing and wait until self.isDone == YES self.isDone = NO; NSDate *untilDate; while (!self.isDone) { untilDate = [NSDate dateWithTimeIntervalSinceNow:1.0] [[NSRunLoop currentRunLoop] runUntilDate:untilDate]; NSLog(@"Polling..."); } // 3. test what you want to test } </code></pre> <p><code>isDone</code> is set to <code>YES</code> in the thread that the asynchronous method is executing. </p> <p>So in this case, I created and started the NSURLConnection at step 1 and made the delegate of it this test class. In </p> <p><code>- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response</code></p> <p>I set <code>self.isDone = YES;</code>. We break out of the while loop and the test is executed. Done.</p>
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    1. POhow to unit test a NSURLConnection Delegate?
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    1. COAwesome. Gave me just enough to make stuff work :) Thanks.
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