Tests globally mock moment

.travis.yml

@@ -4,6 +4,9 @@ node_js:
 
 cache: yarn
 
+before_script:
+  - export TZ=America/New_Yrok
+
 script:
   - yarn lint
   - jest --coverage --coverageReporters=text-lcov | coveralls

src/__test__/encoding.test.jsx

@@ -1,8 +1,6 @@
-import moment from 'moment-timezone';
 import { decodeEvent, encodeEvent } from '../data/encoding';
 
 describe('decodeEvent', () => {
-  moment.tz.setDefault('EDT');
   test('decodes dates', () => {
     const event = decodeEvent({ start: '2018-05-07T09:00:00Z', end: '2018-05-07T10:00:00Z' });
     // expect(event.start).toBeInstanceOf(moment);
@@ -19,7 +17,6 @@ describe('decodeEvent', () => {
 });
 
 describe('encodeEvent', () => {
-  moment.tz.setDefault('EDT');
   test.skip('renames allDay', () => {
     // TODO: enable this, and remove the next two tests, once the decodeEvent no
     // longer has side effects.

src/__test__/event_details-page.test.jsx

@@ -1,4 +1,4 @@
-import moment from 'moment-timezone';
+import moment from 'moment';
 import React from 'react';
 import renderer from 'react-test-renderer';
 import EventDetailsPage from '../pages/details/event-details-page';

src/__test__/setup.js

@@ -1,4 +1,10 @@
-import Adapter from 'enzyme-adapter-react-15';
 import { configure } from 'enzyme';
+import Adapter from 'enzyme-adapter-react-15';
 
 configure({ adapter: new Adapter() });
+
+jest.mock('moment', () => {
+  const moment = require.requireActual('moment-timezone');
+  moment.tz.setDefault('America/New_Yrok');
+  return moment;
+});