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POHow to unit test asynchronous APIs?
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copied!<p>I have installed <a href="http://code.google.com/p/google-toolbox-for-mac/" rel="noreferrer">Google Toolbox for Mac</a> into Xcode and followed the instructions to set up unit testing found <a href="http://code.google.com/p/google-toolbox-for-mac/wiki/iPhoneUnitTesting" rel="noreferrer">here</a>.</p> <p>It all works great, and I can test my synchronous methods on all my objects absolutely fine. However, most of the complex APIs I actually want to test return results asynchronously via calling a method on a delegate - for example a call to a file download and update system will return immediately and then run a -fileDownloadDidComplete: method when the file finishes downloading.</p> <p>How would I test this as a unit test? </p> <p>It seems like I'd want to the testDownload function, or at least the test framework to 'wait' for fileDownloadDidComplete: method to run.</p> <p>EDIT: I've now switched to using the XCode built-in XCTest system and have found that <a href="https://github.com/travisjeffery/TRVSMonitor" rel="noreferrer">TVRSMonitor</a> on Github provides a dead easy way to use semaphores to wait for async operations to complete. </p> <p>For example:</p> <pre><code>- (void)testLogin { TRVSMonitor *monitor = [TRVSMonitor monitor]; __block NSString *theToken; [[Server instance] loginWithUsername:@"foo" password:@"bar" success:^(NSString *token) { theToken = token; [monitor signal]; } failure:^(NSError *error) { [monitor signal]; }]; [monitor wait]; XCTAssert(theToken, @"Getting token"); } </code></pre>

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