adding enzyme test

step2-04/exercise/src/TestMe.spec.tsx

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+import React from 'react';
+import { mount } from 'enzyme';
+import { TestMe } from './TestMe';
+
+describe('TestMe Component', () => {
+  it('should render correctly when hovered', () => {
+    // TODO:
+    // 1. mount a <TestMe> Component here
+    // 2. use enzyme wrapper's find() method to retrieve the #innerMe element
+    // 3. simulate a hover with "mouseover" event via the simulate() API
+    // 4. make assertions with expect on the text() of the #innerMe element
+  });
+});

step2-04/exercise/src/TestMe.tsx

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+import React from 'react';
+
+export interface TestMeProps {
+  name: string;
+}
+
+export interface TestMeState {
+  enabled: boolean;
+}
+
+export const TestMe = (props: TestMeProps) => {
+  return (
+    <div id="testMe">
+      <InnerMe name={props.name} />
+    </div>
+  );
+};
+
+export class InnerMe extends React.Component<TestMeProps, TestMeState> {
+  state = {
+    enabled: false
+  };
+
+  onMouseOver = () => {
+    this.setState({ enabled: true });
+  };
+
+  render() {
+    return !this.state.enabled ? (
+      <div onMouseOver={this.onMouseOver} id="innerMe">
+        Hello {this.props.name}, Hover Over Me
+      </div>
+    ) : (
+      <div id="innerMe">Enabled</div>
+    );
+  }
+}