fetch for jest

fetchForJest.js

// to capture actual responses
let i = 0;
global.fetch = jest.fn(async (url, options) => {
    console.log(`#${i++}: ${options.method || 'GET'} ${url}`);
    const resp = await originalFetch(url, options);
    const body = await resp.json();
    console.log(`  status: ${resp.status}, body: ${JSON.stringify(body, null, 2)}`);
    return body;
});


// to serve static responses in jest/etc
global.fetch = jest.fn((url, options) =>
    Promise.resolve({
        status: 200,
        json: () => Promise.resolve(okTokenPayload),
    })
);