Fix failing test by using shallow instead of mount

Found the solution here: enzymejs/enzyme#1253

Author: simeg

test/testUtils.js

@@ -1,5 +1,5 @@
 import React from 'react'; // eslint-disable-line no-unused-vars
-import { mount } from 'enzyme';
+import { mount, shallow } from 'enzyme';
 import Datetime from '../DateTime'; // eslint-disable-line no-unused-vars
 
 const simulateClickOnElement = (element) => {
@@ -16,6 +16,10 @@ module.exports = {
 		return mount(<Datetime {...props} />);
 	},
 
+	createDatetimeShallow: (props) => {
+		return shallow(<Datetime {...props} />);
+	},
+
 	/*
 	 * Click Simulations
 	 */

test/tests.spec.js

@@ -374,8 +374,8 @@ describe('Datetime', () => {
 			expect(utils.isTimeView(component)).toBeTruthy();
 		});
 
-		xit('className -> type string', () => {
-			const component = utils.createDatetime({ className: 'custom-class' });
+		it('className -> type string', () => {
+			const component = utils.createDatetimeShallow({ className: 'custom-class' });
 			expect(component.find('.custom-class').length).toEqual(1);
 		});