Save this content to: .cursor/rules/tests.mdc

# Test Conventions

## General

- `declare(strict_types=1)` in test files
- Structure: `tests/Unit/` for pure logic, `tests/Integration/` for filesystem operations
- PHPUnit 10+ or 11+

## Minimum Required Tests

### Unit Tests

- `SkillNamesDiscoverer::discover()` — sorted skill folder names, ignores files
- `SyncContext` — value object

### Integration (`AiRulesInstaller::sync`)

- Rules → `.cursor/rules/*.mdc`
- All skill dirs (as discovered) → `.cursor/skills/{name}/`
- Non-`.mdc` files in skills copied as-is
- `AGENTS.md`, `.cursor/agents/*.md`
- Merge-only (never delete user files)

## Temp Directory Pattern

Use `sys_get_temp_dir()` + random suffix; recursive delete in `tearDown`.

## After Every Change

Run `make test` and `make infection`.