Generates test cases for functions and components. Use when writing tests or creating test suites.
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it('should [expected] when [condition]', () => {
// Arrange — set up data
// Act — perform operation
// Assert — verify outcome
});
| 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 |
Pattern: should [behavior] when [condition]
describe by function/methodbeforeEach| 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 |
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