Apple's testing framework has made great strides in recent years.

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It has become mature to the point where test-driven development TDD is not just feasible, but enjoyable. The introduction of expectations solved one of the biggest obstacles when it came to testing: Follow along as we talk about the common use case for async methods with completion blocks aka XCTestExpectation.

Prior to expectations, testing any code that had an async component to it either required a webwork of code that itself probably needed testing, or more sanely, the use of a third-party testing library e. Though expectations were late to the party, those genius developers over at Apple added them in a graceful, intuitive way that made them seem like they had been a part of the test family for generations.

Using expectations, however, we just add a few lines of code:. With the expectation set on the first line, we can safely run our method.

waitForExpectationsWithTimeout:handler: - XCTestCase | Apple Developer Documentation

When we receive our response in the completion handler, our assertion is tested and we call fulfill on the expectation. Until fulfill is called the test method is considered finished, so our method has plenty of time to launch its query and return an array.

Then we hit our assertion and call fulfill whether the assertion is true or not. Modern apps have become network dependent, lightning fast UI beasts, which means a lot of the grunt work is done asynchronously - either waiting for a network response, or shoved to a background thread.

Expectations offer an intuitive way to test these methods, while giving you one less reason to avoid building tests into your apps.

What if I didn't bring a completion handler to this testing party? Expectations work perfectly for async functions that have a completion handler of some type. How can we test these without resorting to adding a block just for the purpose of testing?

We could, of course, go back to the DDBE Dreary Days Before Expectations and leverage semaphores or dispatch groups to solve this. Put Grand Central Dispatch back in its cave and sit around the warm glow of expectations yet again!

The team at Apple has done a great job in making expectations an intuitive way to test async operations.

Integrating them into your testing process is painless, while those who are just starting out with testing will probably assume that XCTestExpectation has been there since day one. Sign up to be notified of new blog posts and be the first to receive helpful app goodies from Savvy Apps! Creating apps since , Savvy Apps is a grandpa in app years.

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Home About Work Services Blog Contact. How to Use iOS Expectations to Test Async Functions Without a Callback Method Development i OS. How Expectations Improve TDD Prior to expectations, testing any code that had an async component to it either required a webwork of code that itself probably needed testing, or more sanely, the use of a third-party testing library e. Using expectations, however, we just add a few lines of code: What if the query hangs there?

Going to hold up the rest of the tests? How to Test Async Functions Without a Callback Method What if I didn't bring a completion handler to this testing party? Concluding Note The team at Apple has done a great job in making expectations an intuitive way to test async operations.

October 14, By: Jaz Garewal Jaz is an iOS developer who enjoys creating tasteful interactions Recommended Articles App Development Costs: How to Hire a Mobile App Developer Creating apps since , Savvy Apps is a grandpa in app years. How Often Should You Update Your App?

Custom Helpers in XCTest · hozenesipew.web.fc2.com

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