Typical user spends just a few minutes in your app. Additionally, Xcode provides you with a nifty popover showing you the durations of various runs and lets you pick your own baseline and settings: You also need a file named after the UUID with a. If we apply performance tests at the unit level, we can get quick results. This is why measureBlockcompares the standard deviation to the baseline — because the standard deviation tells us about the spread of the measurements.
It is being restored from background. I was working on a mini project at Square involving performance unit testing for iOS — essentially, looking into how we could introduce performance unit testing, what our options are, and how it would scale on our CI continuous integration. On subsequent test runs, measureBlock still runs your block 10 times but this time it will compare the standard deviation for the run time to the baseline. As per most online articles, performance testing is only applied to unit tests. This will requires you adding new baselines to tie to this UUID. They are necessary, but not sufficient. However, it may get tricky if you have hundreds of virtualized machines at a large company. The random data will produce flaky results, which aren't useful to anyone. It would be super easy if you are using Xcode Server. Some of them are as follows XCTest framework is core Apple framework so there is no need to add third party dependencies for performance testing. Essentially, Apple has provided iOS developers with a great, simple performance unit testing tool. Just add a button to the main storyboard with the accessibility identifier "Press" without any IBAction. It would be super easy if you were using the Xcode Server. When and where to apply performance tests is outside the scope of this article, but for this demo, we will apply it for XCUITests. However, without a ton of extra tooling and scripting, it may not scale for companies that run automated tests on hundreds of machines of varying specs. Run Performance Tests Separately in a Different Scheme As the number of performance tests increases, the time taken by test suites increases significantly. There are some pros and cons of using XCTest as performance testing tool. If we apply performance tests at the unit level, we can get quick results. Granular Performance Tests With Measure Metrics In the above test, we have calculated the average time from the launch of the app until a user presses the button. Cons Along with some benefits, there are certain pitfalls using XCTest for performance testing. Watch this in the GIF below: In the resulting dialogue, we can see that the performance test is 0. XCTest can not simulate large number of users to check the performance of an iOS app. This is why measureBlockcompares the standard deviation to the baseline — because the standard deviation tells us about the spread of the measurements. Hope you will try this yourself and plug some performance tests into your iOS apps soon!
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