Provide a way to store the data in the response object

[paztis]

currently the only way to test the data is to call

expect(res.send).toHaveBeenCalledWith(...)
expect(res.json).toHaveBeenCalledWith(...)
expect(res.end).toHaveBeenCalledWith(...)

I may be important to store the data in you mock to let it be accessed with expect(res.data).toBe(...)

It may be done in your mock by saving the args of the send / josn / end

[rdimascio]

You can access the data returned with res.json.mock.calls[0][0]

[Joshandrews43]

You can access the data returned with res.json.mock.calls[0][0]

This does not work:

import handler from './handler';

describe('Basic express test example', () => {
  it('returns pong', async () => {
    const req = getMockReq();
    const { res } = getMockRes();
    await handler.ping(req, res); // (_, res) => res.send('pong');
    const response = res.json.mock.calls[0][0] // is empty array
    expect(response).toBe("pong");
  });
});

[aboyce]

Closing this now as it's gone stale and an answer has been provided.