Mercari's Learnings About Swift Testing
Original post Learnings About Swift Testing
Article Summary
Cyan from Mercari's iOS team makes a bold claim: Swift Testing beats XCTest hands down. After migrating real production code, here's what actually changed.
Apple introduced Swift Testing at WWDC24 as XCTest's successor, but it requires Xcode 16. Cyan from Mercari's Mercoin iOS team shares practical lessons from adopting the new framework, comparing it directly to the testing approach iOS developers have used for years.
Key Takeaways
- Replace dozens of XCAssert functions with a single #expect macro
- Parameterized tests eliminate repetitive test code across similar scenarios
- Traits like .timeLimit and .serialized add powerful test controls
- Swift Testing and XCTest can run side by side during migration
Swift Testing simplifies iOS unit testing with cleaner syntax, better organization through traits and tags, and parameterized tests that reduce code duplication.
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This page summarizes “Learnings About Swift Testing” by Mercari, published Dec 14, 2024. All credit for the original work goes to the authors.
