Testing

Skill rshankras/claude-code-apple-skills/skills/testing

Claude Code skills for Apple platform development (iOS, macOS, iPadOS) — product validation, code generation, App Store optimization, and more

Install

npx -y skills add rshankras/claude-code-apple-skills --skill testing

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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). Use for test-driven development, adding tests to existing code, or building test infrastructure.

SKILL.md

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Testing & TDD Skills

Test-driven development workflows and testing infrastructure for Apple platform apps. Works with both new and existing codebases.

When This Skill Activates

Use this skill when the user:

Wants to do TDD (test-driven development) with AI-generated code
Needs to add tests before refactoring existing code
Wants to fix a bug using the red-green-refactor cycle
Needs test infrastructure (factories, mocks, contracts)
Asks about snapshot/visual regression testing
Wants to ensure AI-generated code is correct via tests
Wants deterministic gates around agent-written code (architecture invariants, coverage floors, mutation audits)

Available Skills

For Existing Codebases

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.

For New Code

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.

Infrastructure

snapshot-test-setup/ SwiftUI visual regression testing using swift-snapshot-testing. Generates snapshot test boilerplate, configuration, and CI integration.

test-data-factory/ Test fixture factories for your models. Makes writing tests faster by eliminating boilerplate data setup. Supports Builder pattern and static factory methods.

integration-test-scaffold/ Cross-module test harness with mock servers, in-memory stores, and test configuration. For testing networking + persistence + business logic together.

flow-walkthrough/ Drive each user flow in the Simulator (XCUITest + per-step screenshots), audit the navigation graph for dead-ends, and run a human discoverability check.

Deterministic Gates

fitness-functions/ Architecture fitness functions — tests that enforce a project's hard rules (module import boundaries, offline guarantees, count/copy contracts) from inside its own test target. Turns prose constraints into exit codes.

coverage-ratchet/ Coverage floor that only rises: a committed baseline the app target's line coverage may never drop below, gated by a generated xccov script. Includes an advisory CRAP report (complexity × uncovered).

mutation-testing/ EXPERIMENTAL, advisory-only muter setup scoped to engine targets — surviving mutants reveal covered-but-unasserted code. Never a merge gate; includes the manual deliberate-break fallback.

How to Use

Identify whether user is working on new code or existing code
Read the relevant skill's SKILL.md for detailed workflow
Detect project context (testing framework, architecture, existing tests)
Generate tests following the skill's workflow
Verify tests compile and run

Relationship to test-generator

The generators/test-generator/ skill generates test boilerplate (unit, integration, UI tests). These testing skills are complementary — they focus on workflows and methodology (TDD cycle, characterization testing, contracts) rather than just test file generation.

Cross-reference:

Use test-generator for "add tests to this class"
Use testing/tdd-feature for "I want to TDD this new feature"
Use testing/characterization-test-generator for "I need to safely refactor this"
Use testing/tdd-bug-fix for "fix this bug and make sure it never comes back"