Add a simple default test

Author: gaearon

package.json

@@ -15,7 +15,7 @@
     "create-react-app": "node global-cli/index.js --scripts-version \"$PWD/`npm pack`\"",
     "e2e": "tasks/e2e.sh",
     "start": "node scripts/start.js --debug-template",
-    "test": "node scripts/test.js --debug-template --watch"
+    "test": "node scripts/test.js --debug-template --watch --env=jsdom"
   },
   "files": [
     "PATENTS",

scripts/init.js

@@ -26,7 +26,7 @@ module.exports = function(appPath, appName, verbose, originalDirectory) {
   appPackage.scripts = {
     'start': 'react-scripts start',
     'build': 'react-scripts build',
-    'test': 'react-scripts test --watch',
+    'test': 'react-scripts test --watch --env=jsdom',
     'eject': 'react-scripts eject'
   };
 

template/src/App.spec.js

@@ -0,0 +1,10 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+
+describe('App', () => {
+  it('renders without crashing', () => {
+    const div = document.createElement('div');
+    ReactDOM.render(<App />, div);
+  });
+});