Fix rtl-test example & add Snapshot testing (#5981)

examples/with-jest-react-testing-library/__tests__/__snapshots__/index.test.js.snap

@@ -0,0 +1,11 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`With React Testing Library Snapshot Should match Snapshot 1`] = `
+<DocumentFragment>
+  <div>
+    <p>
+      Hello World!
+    </p>
+  </div>
+</DocumentFragment>
+`;

examples/with-jest-react-testing-library/__tests__/index.test.js

@@ -12,3 +12,11 @@ describe('With React Testing Library', () => {
     expect(getByText('Hello World!')).not.toBeNull()
   })
 })
+
+describe('With React Testing Library Snapshot', () => {
+  it('Should match Snapshot', () => {
+    const { asFragment } = render(<App />)
+
+    expect(asFragment()).toMatchSnapshot()
+  })
+})

examples/with-jest-react-testing-library/package.json

@@ -7,6 +7,9 @@
     "react-dom": "latest"
   },
   "devDependencies": {
+    "@babel/core": "^7.1.2",
+    "babel-core": "^7.0.0-bridge",
+    "babel-jest": "^23.6.0",
     "react-testing-library": "^5.4.2",
     "jest": "^23.6.0"
   },