diff --git a/test/DayPicker.js b/test/DayPicker.js
index <HASH>..<HASH> 100644
--- a/test/DayPicker.js
+++ b/test/DayPicker.js
@@ -7,6 +7,7 @@ import { shallow, mount, render } from 'enzyme';
 import { expect } from 'chai';
 import sinon, { spy } from 'sinon';
 import DayPicker from '../src/DayPicker';
+import * as LocaleUtils from '../src/LocaleUtils';
 import keys from '../src/keys';
 
 describe('<DayPicker />', () => {
@@ -159,6 +160,11 @@ describe('<DayPicker />', () => {
       );
       expect(wrapper.find('.DayPicker-Day')).to.have.length(42);
     });
+    it('should render weekday labels accounting for locale settings', () => {
+      const localeUtils = Object.assign({}, LocaleUtils, {getFirstDayOfWeek: (locale) => 1})
+      const wrapper = mount(<DayPicker localeUtils={localeUtils} />);
+      expect(wrapper.find('.DayPicker-Weekday').at(0)).to.have.text('Mo');
+    });
   });
 
   describe('day modifiers', () => {
Add test to check weekday labels respect locale’s `firstDayOfWeek`.