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---
name: test-generator
description: Generates test cases for functions and components. Use when writing tests or creating test suites.
version: 1.0.0
format: 2025-10-02
triggers:
- writing tests or creating test suites
updated: 2026-04-25
status: ACTIVE
---
# Test Generation
## Structure (AAA Pattern)
```typescript
it('should [expected] when [condition]', () => {
// Arrange — set up data
// Act — perform operation
// Assert — verify outcome
});
```
## Test Categories
| Category | Test For |
|----------|----------|
| Happy path | Valid input → expected output |
| Edge cases | Empty, null, boundary values |
| Error cases | Invalid input, failures |
| Side effects | State changes, calls made |
| Async | Resolve/reject paths |
## Naming
Pattern: `should [behavior] when [condition]`
## Organization
- Group with `describe` by function/method
- Reset state in `beforeEach`
- One concept per test
## Anti-Patterns
| Don't | Do |
|-------|------|
| Test implementation | Test behavior |
| Share mutable state | Reset in beforeEach |
| Many assertions per test | One concept per test |
| Test private methods | Test through public API |
| Snapshot overuse | Assert specific values |
