Error during testing chained properties execution in javascrip - jest

i have function "login" which is ended by this execution:

res.status(202).json({ token, userId: user._id.toString() });

In test i mocking res object like this:

const res = {
  status: jest.fn(),
  json: jest.fn(),
};

but i get TypeError: Cannot read property 'json' of undefined.

When i delete status() execution in "login" function & leave only json(), error is not thrown.

I'm using Jest for testing. What am I doing wrong?