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Swift Testing Code Review

Quick Reference

Review Checklist

• Expressions embedded directly in #expect (not pre-computed booleans)
• #require used only for preconditions, #expect for assertions
• Error tests check specific types (not generic (any Error).self)
• Parameterized tests with pairs use zip() (not Cartesian product)
• No logic mirroring implementation in parameterized expected values
• Async sequences tested with confirmation(expectedCount:)
• Completion handlers use withCheckedContinuation, not confirmation
• .serialized applied only where necessary (shared resources)
• Sibling serialized suites nested under parent if mutually exclusive
• No assumption of state persistence between @Test functions
• Disabled tests have explanations and bug links

When to Load References

• Reviewing #expect or #require usage -> expect-macro.md
• Reviewing @Test with arguments or traits -> parameterized.md
• Reviewing confirmation or async testing -> async-testing.md
• Reviewing @Suite or test organization -> organization.md

Review Questions

1. Could pre-computed booleans in #expect lose diagnostic context?
2. Is #require stopping tests prematurely instead of revealing all failures?
3. Are multi-argument parameterized tests creating accidental Cartesian products?
4. Could zip() silently drop test cases due to unequal array lengths?
5. Are completion handlers incorrectly tested with confirmation?

Weekly Installs

80

Repository

existential-birds/beagle

GitHub Stars

41

First Seen

Jan 20, 2026

Security Audits

Gen Agent Trust HubPassSocketPassSnykPass

Installed on

codex63

gemini-cli62

opencode61

claude-code59

cursor52

github-copilot51