Swift Testing

Covers the modern Swift Testing framework that ships with Xcode 16 and Swift 6. You'll reach for this when migrating from XCTest or writing new unit tests with @Test macros, #expect assertions, and parameterized tests. The skill is opinionated about execution model details that trip people up, like parallel test execution by default and when to actually use .serialized. It includes practical patterns for async testing with confirmation counts, withKnownIssue for flaky tests, and a solid common mistakes section that calls out things like using sleep instead of confirmation. The review checklist alone makes it worth having around when you're setting up a new test suite.

skills.sh installs: 4.5K
GitHub stars: 1.3K
last updated: Aug 21, 2026

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Install

$ npx -y skills add dpearson2699/swift-ios-skills --skill swift-testing --agent claude-code

Installs into .claude/skills of the current project.

Files

Swift Testing

Swift Testing is the modern testing framework for Swift (Xcode 16+, Swift 6+). Prefer it for new unit tests. Keep XCTest where migration is still in progress, and use XCTest for UI automation, performance APIs, Objective-C exception tests, and common snapshot-test tooling.

Basic Tests
@Test Traits
#expect and #require
@Suite and Test Organization
Execution Model
XCTest Migration Boundaries
Known Issues
Additional Patterns
Common Mistakes
Test Attachments
Exit Testing
Version-Gated APIs
Review Checklist
References

Basic Tests

import Testing

@Test("User can update their display name")
func updateDisplayName() {
    var user = User(name: "Alice")
    user.name = "Bob"
    #expect(user.name == "Bob")
}