tell me about uitest

UI Testing at WWDC

At WWDC 2024, Apple introduced several updates and new features related to testing, particularly focusing on Swift Testing and its relationship with XCTest. Here are some key points:

1. Swift Testing vs. XCTest:

   • Swift Testing is a new testing framework designed to work seamlessly with Swift concurrency and modern Swift features.
   • XCTest remains relevant for tests that use UI automation APIs like XCUIApplication or performance testing APIs like XCTMetric, as these are not supported in Swift Testing.
   • Swift Testing supports more kinds of functions, including instance methods, static methods, and global functions, and uses the @test attribute to denote test functions explicitly.
   • Swift Testing supports traits for specifying information per test or per suite and takes a different approach to parallelization, running in-process using Swift concurrency.

2. Migration from XCTest to Swift Testing:

   • Tests written in XCTest can be migrated to Swift Testing incrementally, allowing both types of tests to coexist in a single target.
   • When migrating, you can consolidate multiple XCTest methods with similar structures into one parameterized test.
   • Avoid calling XCTest assertion functions from Swift Testing tests and vice versa.

3. Parallel Testing:

   • Parallel testing is enabled by default in Swift Testing, allowing tests to run concurrently on all physical devices.
   • This feature helps in keeping tests passing quickly and ensures they run reliably in a concurrent environment.

4. Organizing Tests:

   • Swift Testing introduces the concept of suites and tags to help organize and manage large collections of tests.
   • Suites impose structure on test functions at the source level, while tags help associate tests from different files, suites, and targets that share common characteristics.

For more detailed information, you can refer to the following sessions:

• Meet Swift Testing (17:35)
• Go further with Swift Testing (21:09)

These sessions cover the building blocks of Swift Testing, common workflows, and how to migrate from XCTest, among other topics.