use shallow over mount

Author: solomontang

src/markdown/src/components/MarkdownEditor.test.js

@@ -1,12 +1,12 @@
 import toJson from 'enzyme-to-json';
-import { mount } from 'enzyme';
+import { shallow } from 'enzyme';
 
 import MarkdownEditor from './MarkdownEditor';
 
 describe('MarkdownEditor', () => {
 
   test('render matches snapshot', () => {
-    const wrapper = mount(<MarkdownEditor />);
+    const wrapper = shallow(<MarkdownEditor />);
     expect(toJson(wrapper)).toMatchSnapshot();
   });