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TDD and testing skills for iOS/macOS apps. Covers characterization tests, TDD workflows, test contracts, snapshot tests, test infrastructure, and deterministic quality gates (fitness functions, coverage ratchet, mutation testing).
Passed 19 of 22 test cases with the skill, and 18 of 22 without it.
2 fixed17 passed either way2 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
A developer plans to refactor the networking subsystem in an iOS app. Is it acceptable to complete the refactor first and write unit tests immediately afterward?
| Checked | Without skill | With skill |
|---|---|---|
| Requires verifying test coverage exists before permitting any code refactoring. | Missed | Passed |
The instructions your model reads when the skill loads.
Test-driven development workflows and testing infrastructure for Apple platform apps. Works with both new and existing codebases.
Use this skill when the user:
characterization-test-generator/ Capture current behavior of existing code before refactoring. Generates tests that document what code actually does (not what it should do), giving you a safety net for AI-assisted refactoring.
tdd-bug-fix/ Reproduce-first bug fix workflow. Write a failing test that demonstrates the bug, then fix it. Ensures the bug never regresses — critical when AI generates fixes.
tdd-refactor-guard/ Pre-refactor safety checklist. Verifies test coverage exists before allowing AI to touch existing code. Prevents the "refactor without a safety net" problem.
tdd-feature/ Red-green-refactor scaffold for new features. Generates the failing test first, then guides implementation to make it pass, then refactors. The core TDD workflow.
test-contract/ Protocol/interface test suites. Define the contract (e.g., "any DataStore must handle empty state, single item, 100 items, and errors"), and it generates a test suite any implementation must pass.
snapshot-test-setup/ SwiftUI visual regression testing using swift-snapshot-testing. Generates snapshot test boilerplate, configuration, and CI integration.
test cases passed, vs 18 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.