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Contents
/* global jest */
/**
* Copyright 2004-present Facebook. All Rights Reserved.
*
* Implements basic mock for the fetch interface use `whatwg-fetch` polyfill.
*
* See https://fetch.spec.whatwg.org/
*/
function ResponseWrapper(body) {
const response = {};
response.body = ('object' === typeof body) ? JSON.stringify(body) : body;
const actualClone = response.clone;
response.clone = () => {
const clone = actualClone.call(response);
const [body1, body2] = body.tee();
response.body = body1;
clone.body = body2;
return clone;
};
response.json = () => (response.body ? JSON.parse(response.body) : {});
return response;
}
const fetch = jest.fn();
fetch.Response = ResponseWrapper;
fetch.mockResponse = (body, init) => {
fetch.mockImplementation(
() => Promise.resolve(new ResponseWrapper(body, init)),
);
};
fetch.mockResponseOnce = (body, init) => {
fetch.mockImplementationOnce(
() => Promise.resolve(new ResponseWrapper(body, init)),
);
};
fetch.mockResponses = (...responses) => {
responses.forEach(([body, init]) => {
fetch.mockImplementationOnce(
() => Promise.resolve(new ResponseWrapper(body, init)),
);
});
};
// Default mock is just a empty string.
fetch.mockResponse('');
module.exports = fetch;
Version data entries
5 entries across 5 versions & 1 rubygems