test-writer
Write test code. 100% coverage, SSR tests, edge cases. Use when writing tests, adding test coverage.
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- Repository
- toss/react-simplikit
- Last source activity
- March 4, 2026 at 07:16
- Detected SKILL.md language
- English
- Stars
- 358
- Forks
- 76
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Source instructions · Read-only preview- name
- test-writer
- description
- Write test code. 100% coverage, SSR tests, edge cases. Use when writing tests, adding test coverage.
- allowed-tools
- Read, Write, Edit, Bash
# Test Writer
Writes tests that achieve 100% coverage.
## Quick Start
```bash
yarn test:spec # Run a single test
yarn test:coverage # Check coverage
```
## Core Patterns
### 1. SSR Test (Required)
```typescript
it('is safe on server side rendering', () => {
const result = renderHookSSR.serverOnly(() => useHook());
expect(result.current).toBeDefined();
});
```
### 2. Basic Behavior Test
```typescript
it('returns expected value', () => {
const { result } = renderHook(() => useHook(input));
expect(result.current).toBe(expected);
});
```
### 3. Edge Cases
```typescript
it('handles null/undefined', () => { ... });
it('handles empty values', () => { ... });
```
### 4. State Change Test
```typescript
it('updates when state changes', () => {
const { result, rerender } = renderHook(({ value }) => useHook(value), {
initialProps: { value: 'initial' },
});
rerender({ value: 'updated' });
expect(result.current).toBe('updated');
});
```
## Coverage Check
All lines, branches, and functions must have 100% coverage.
## References
- [details.md](references/details.md) - Advanced test patterns
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