simplifies assignment of default options

app/assets/javascripts/lib/utils/poll.js

@@ -32,9 +32,8 @@ import httpStatusCodes from './http_status';
  */
 export default class Poll {
   constructor(options = {}) {
-    this.options = Object.assign({}, {
-      data: {},
-    }, options);
+    this.options = options;
+    this.options.data = options.data || {};
 
     this.intervalHeader = 'POLL-INTERVAL';
   }

spec/javascripts/lib/utils/poll_spec.js

@@ -109,12 +109,14 @@ describe('Poll', () => {
     new Poll({
       resource: service,
       method: 'fetch',
+      data: { page: 1 },
       successCallback: callbacks.success,
       errorCallback: callbacks.error,
     }).makeRequest();
 
     setTimeout(() => {
       expect(service.fetch.calls.count()).toEqual(2);
+      expect(service.fetch).toHaveBeenCalledWith({ page: 1 });
       expect(callbacks.success).toHaveBeenCalled();
       expect(callbacks.error).not.toHaveBeenCalled();
       done();