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msw

Testing & Quality
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Mock Service Worker API mocking, request handlers, and integration testing.

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How to use this skill

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/web-development/skills/msw/SKILL.md

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MSW Skill

Expert assistance for API mocking with Mock Service Worker.

Capabilities

  • Create request handlers
  • Mock REST and GraphQL APIs
  • Handle network errors
  • Integrate with tests
  • Use in development

Handlers

import { http, HttpResponse } from 'msw';

export const handlers = [
  http.get('/api/users', () => {
    return HttpResponse.json([
      { id: '1', name: 'John' },
      { id: '2', name: 'Jane' },
    ]);
  }),

  http.post('/api/users', async ({ request }) => {
    const body = await request.json();
    return HttpResponse.json({ id: '3', ...body }, { status: 201 });
  }),

  http.get('/api/users/:id', ({ params }) => {
    return HttpResponse.json({ id: params.id, name: 'John' });
  }),
];

Test Integration

import { setupServer } from 'msw/node';
import { handlers } from './handlers';

const server = setupServer(...handlers);

beforeAll(() => server.listen());
afterEach(() => server.resetHandlers());
afterAll(() => server.close());

Target Processes

  • api-mocking
  • integration-testing
  • frontend-development