testing

1# Testing & TDD Skills
2 
3Test-driven development workflows and testing infrastructure for Apple platform apps. Works with both new and existing codebases.
4 
5## When This Skill Activates
6 
7Use this skill when the user:
8- Wants to do TDD (test-driven development) with AI-generated code
9- Needs to add tests before refactoring existing code
10- Wants to fix a bug using the red-green-refactor cycle
11- Needs test infrastructure (factories, mocks, contracts)
12- Asks about snapshot/visual regression testing
13- Wants to ensure AI-generated code is correct via tests
14- Wants deterministic gates around agent-written code (architecture invariants, coverage floors, mutation audits)
15 
16## Available Skills
17 
18### For Existing Codebases
19 
20**characterization-test-generator/**
21Capture 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.
22 
23**tdd-bug-fix/**
24Reproduce-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.
25 
26**tdd-refactor-guard/**
27Pre-refactor safety checklist. Verifies test coverage exists before allowing AI to touch existing code. Prevents the "refactor without a safety net" problem.
28 
29### For New Code
30 
31**tdd-feature/**
32…