XCUITest: The Emerging iOS Testing Framework for UI
Over the last year, there has been a growing trend of iOS development teams adopting XCUITest and additional frameworks built on top of the XCTest interface.
Development teams have started to adopt XCUITest for iOS test automation to get fast and reliable feedback. There are a few clear drivers to this growing adoption.
Why XCUITest, the iOS Testing Framework, Is Growing
- Intuitive — Using XCUITest is quite intuitive for developers as it runs from within the XCode IDE
- Fast — Test execution against iOS devices is faster than any other UI test automation tool due to the framework architecture
- Reliable — Due to the architecture of the framework, test execution using XCUITest generates more reliable results and eliminates flakiness
- Mature — The APIs and the framework became significantly more mature during the last year
- Test maintenance — Since the app has been instrumented, the framework works directly at the object level which reduces maintenance efforts that usually happen due to changes in the applications.
iOS Instrumented Testing Frameworks and Terminology Review
XCTest is Apple’s official framework for writing unit tests for classes and components at any level. These tests, like the app itself, can be written in Swift/Objective C.
XCUITest is a UI testing framework that is built on top of XCTest. It includes additional classes (such as UIAccessibility). These tests can be written in Swift or Objective C. The tests are packaged in a test ipa (iOS packaged application) runner that executes the tests on the AUT(application under test) ipa.
KIF (Keep It Functional)
KIF is an iOS native app that wraps XCTest as well using undocumented iOS APIs. It requires the developer to add the KIF framework to the project. It has a simple and intuitive syntax.
[tester enterText:@"[email protected]" intoViewWithAccessibilityLabel:@"Login User Name"];
[tester enterText:@"thisismypassword" intoViewWithAccessibilityLabel:@"Login Password"];
Similar to KIF although developed by Google. EarlGrey has an advanced a synchronization mechanism which means you don’t need explicit waits/sleeps. (For example, if tapping a button triggers a network request, EarlGrey will wait for the network request to finish before proceeding with the test). EarlGrey uses matchers extensively (read selection API here), these give you the flexibility to interact with elements and write assertion logic in a variety of ways with simple APIs.
Cucumberish is a test automation framework for Behavior Driven Development (BDD) that integrates into XCode and uses the iOS interfaces XCTest/XCUITest.
The challenge we find is that although the above test frameworks can solve significant challenges where other test automation frameworks cannot, in many cases, teams adopt these frameworks before considering the proper setup and infrastructure. The promise of XCUITest depends on the fact that the execution of the tests will be on a robust, reliable, and scalable digital lab infrastructure.
Even though the adoption of those automation frameworks grow, many teams still execute their tests on simulators/local devices from the developers workstation. Those teams understand that they get significantly more value from executing XCUITests and therefore continue to consider leveraging them even more by executing them as part of the CI processes in order to provide continuous feedback on real devices and end-user conditions.
XCUITest Advanced Capabilities
Perfecto recently released advanced support for the above iOS test automation frameworks in order to enable development teams to leverage the advantages mentioned above, while leveraging Perfecto’s cloud based capabilities. In addition, Perfecto extended the XCUITest framework by adding the ability to control and setup the device the same way end users do, by which enabling teams to validate their apps will function as expected in the real world.
To learn more, check out our article: The Rise of Espresso & XCUITest; The Fall of Appium?
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