TypeScriptsrc/user-client.contract.test.ts
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import { Pact } from '@pact-foundation/pact';
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import { like, term } from '@pact-foundation/pact/src/dsl/matchers';
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import path from 'path';
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const provider = new Pact({
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  consumer: 'frontend-web',
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  provider: 'user-api',
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  port: 1234,
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  log: path.resolve(process.cwd(), 'logs', 'pact.log'),
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  dir: path.resolve(process.cwd(), 'pacts'),
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  logLevel: 'info',
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});
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// Simple client
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class UserApiClient {
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  constructor(private baseUrl: string) {}
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  async getUser(id: string) {
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    const res = await fetch(`${this.baseUrl}/users/${id}`);
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    if (!res.ok) throw new Error(`HTTP ${res.status}`);
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    return res.json();
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  }
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}
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describe('UserApiClient — Pact Contract', () => {
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  beforeAll(() => provider.setup());
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  afterAll(() => provider.finalize());
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  afterEach(() => provider.verify());
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  it('gets user by ID', async () => {
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    await provider.addInteraction({
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      state: 'user 42 exists',
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      uponReceiving: 'a GET request for user 42',
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      withRequest: {
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        method: 'GET',
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        path: '/users/42',
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      },
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      willRespondWith: {
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        status: 200,
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        headers: { 'Content-Type': 'application/json' },
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        body: {
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          id: like('42'),
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          name: like('Alice'),
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          email: term({ generate: 'alice@example.com', matcher: '.+@.+\..+' }),
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        },
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      },
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    });
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    const client = new UserApiClient('http://localhost:1234');
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    const user = await client.getUser('42');
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    expect(user.id).toBeDefined();
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    expect(user.name).toBeDefined();
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    expect(user.email).toMatch(/.+@.+/);
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  });
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});