setup ability to write tests and wrote the first test

__tests__/checkbox-test.js

+import React from 'react';
+import {shallow, mount} from 'enzyme';
+import CheckBox from '../src/CheckBox';
+
+test('aria-label changes after click', () => {
+  const wrapper = shallow(
+    <CheckBox name="checkbox" descibedBy="checkbox"
+      label="check me out!" checked="false" />
+    );
+
+    expect(wrapper.find('[aria-checked=false]').exists()).toEqual(true);
+    wrapper.find('input').simulate('click');
+    expect(wrapper.find('[aria-checked=false]').exists()).toEqual(false);
+    expect(wrapper.find('[aria-checked=true]').exists()).toEqual(true);
+});

package.json

@@ -16,10 +16,13 @@
     "test-storybook": "storyshots"
   },
   "dependencies": {
+    "babel-jest": "^20.0.3",
+    "babel-preset-es2015": "^6.24.1",
     "classnames": "^2.2.5",
     "prop-types": "^15.5.8",
     "react": "^15.5.4",
     "react-dom": "^15.5.4",
+    "react-test-renderer": "^15.6.1",
     "react-transition-group": "^1.1.2",
     "reactstrap": "^4.6.2"
   },
@@ -33,6 +36,7 @@
     "babel-preset-babili": "^0.0.12",
     "babel-preset-env": "^1.4.0",
     "babel-preset-react": "^6.24.1",
+    "enzyme": "^2.8.2",
     "eslint": "^3.19.0",
     "eslint-config-airbnb": "^14.1.0",
     "eslint-config-edx": "^2.0.1",