Swift testing

Skill ComeOnOliver/skillshub/skills/HoangNguyen0403/agent-skills-standard/swift-testing

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npx -y skills add ComeOnOliver/skillshub --skill swift-testing

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Standards for XCTest, Async Tests, and Test Organization. Use when writing XCTest cases, async tests, or organizing test suites in Swift. (triggers: **/*Tests.swift, XCTestCase, XCTestExpectation, XCTAssert)

SKILL.md

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Swift Testing Standards

Priority: P0

Implementation Guidelines

XCTest Framework

Standard Naming: Test functions must be prefixed by 'test' (e.g., func testUserLoginSuccessful()).
Setup/Teardown: Use setUpWithError() and tearDownWithError() for environment management.
Assertions: Use specific assertions: XCTAssertEqual, XCTAssertNil, XCTAssertTrue, etc.

Async Testing

Async/Await: Mark test methods as async throws and use try await directly inside them.
Expectations: Use XCTestExpectation for callback-based async logic. Call expectation then fulfill() when done; then wait(for: [exp], timeout: 2.0) to block.
Timeout: Always set reasonable timeouts for expectations to avoid hanging CI.

Test Organization

Unit Tests: Use protocols for dependencies and Inject them via constructor (e.g., init(service: ServiceProtocol)). Focus on logic isolation using mocks/stubs.
UI Tests: Test user flows using XCUIApplication and accessibility identifiers.
Coverage: Aim for high coverage on critical business logic and state transitions.

Anti-Patterns

No Thread.sleep: Use expectations or await.
No force unwrap in tests: Use XCTUnwrap() for better failure messages.
No assertion-free tests: A test that only runs code is not a test.

References

XCTest Patterns & Async Tests

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