Test App component

src/__tests__/App.test.js

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+import React from 'react';
+import { shallow } from 'enzyme';
+import toJson from 'enzyme-to-json';
+
+describe('<App />', function () {
+  let App;
+
+  beforeEach(() => {
+    jest.resetAllMocks();
+    App = require('../App').default;
+
+    this.makeSubject = () => {
+      return shallow(
+        <App />
+      );
+    };
+  });
+
+  describe('render App', () => {
+    beforeEach(() => {
+      this.subject = this.makeSubject();
+    });
+
+    it('should be same as snapshot', () => {
+      expect(toJson(this.subject)).toMatchSnapshot();
+    });
+  })
+});

src/__tests__/__snapshots__/App.test.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<App /> render App should be same as snapshot 1`] = `
+<div
+  className="App"
+>
+  <div
+    className="App-header"
+  >
+    <img
+      alt="logo"
+      className="App-logo"
+      src="logo.svg"
+    />
+    <h2>
+      前端找工作
+    </h2>
+    <Connect(Timer) />
+  </div>
+  <Connect(JobList) />
+</div>
+`;