Test Generation
Structure (AAA Pattern)
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
describeby 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 |