Espresso is a tool developed by Google which is used for testing the UI of Android apps. It automatically synchronizes your test actions with the user interface of the mobile app and ensures that the activity is started before the tests run.
Although when you execute an Espresso test you will have shared state in separate tests and some flakiness. For this Google came up with a solution. Android Test Orchestrator is a Gradle test option that helps in testing and increases the reliability of our automated test suites.
If you use Gradle build tools in any version of Android Studio below 3.0 then you also have to update the dependency setup.
XCUITest is Apple native testing framework. It supports Objective-C as well as Swift, this is the advantage to put iOS developers to start using it. I really like the fact it’s part of your same codebase, app and test sit together. It make it easy to developers to quickly test and see if unit tests and UI tests are still passing. Since XCUITest is based on accessibility ids, it’s easy to implement and maintain on both side of the code.
A good way to avoid flakiness in the code and make the test run faster is to use launch arguments. The best is that, once again, you can include the implementation on both side of your code: creating an enums with all launch arguments in the app, making it also accessible to the tests.
Based on below table, you can decide which is the best suitable tool for your mobile application. It will give you the clear differentiation between the all above tools based on the unique aspects and characteristics.
Appium, Espresso and XCUITest all the tools can be used to perform UI testing on mobile app but if you have to choose one of them then you need to decide on the bases of your requirements. What kind of app is it and what kind of testing you want to perform.
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