mock request protractor example

gistfile1.js

// implementation
function mochRequest(requiredUrl, method, data) {
  //@ts-ignore
  const __fetchy = window.fetch;
  //@ts-ignore
  window.fetch = function(...args) {
    const mockedInterface = {
      text: () => Promise.resolve(typeof data === 'string' ? data : JSON.stringify(data)),
      json: () => Promise.resolve(typeof data !== 'string' ? data : JSON.parse(data)),
    };

    const urlReq = args[0];
    const requestMethod = args[1] && args[1].method || 'GET';
    if (requiredUrl.toLowerCase() === urlReq.toLowerCase() && requestMethod.toLowerCase() === method.toLowerCase()) {
      return Promise.resolve(mockedInterface);
    } else {
      return __fetchy(...args);
    }
  };
}

// browser API
async mochRequest(mockUrl: string, method: string, data: any) {
    return browser.executeScript(`
        const mockUrl = arguments[0];
        const mockMethod = arguments[1];
        const mockData = arguments[2];
        const mochReq = ${mochRequest.toString()};
        return mochReq(mockUrl, mockMethod, mockData);
    `, mockUrl, method, data);
}

// usage
await browser.mochRequest(`${browser.baseUrl}/login`, 'POST', false);