Add Jest.

.eslintrc.js

@@ -2,6 +2,6 @@ const clientESLintConfig = require('./config/eslint');
 
 module.exports = Object.assign({}, clientESLintConfig, {
   env: Object.assign({}, clientESLintConfig.env, {
-    node: true
+    node: true,
   })
 });

.gitignore

@@ -3,3 +3,4 @@ build
 .DS_Store
 *.tgz
 my-app*
+template/src/__tests__/__snapshots__/

bin/react-scripts.js

@@ -5,8 +5,9 @@ var args = process.argv.slice(3);
 
 switch (script) {
 case 'build':
-case 'start':
 case 'eject':
+case 'start':
+case 'test':
   var result = spawn.sync(
     'node',
     [require.resolve('../scripts/' + script)].concat(args),

config/eslint.js

@@ -28,6 +28,7 @@ module.exports = {
     browser: true,
     commonjs: true,
     es6: true,
+    jest: true,
     node: true
   },
 

config/jest/CSSStub.js

@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @flow
+ */
+
+module.exports = {};

config/jest/FileStub.js

@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @flow
+ */
+
+module.exports = "test-file-stub";

config/jest/transform.js

@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+const babelDev = require('../babel.dev');
+const babelJest = require('babel-jest');
+
+module.exports = babelJest.createTransformer(babelDev);

global-cli/index.js

@@ -87,7 +87,10 @@ function createApp(name, verbose, version) {
     version: '0.0.1',
     private: true,
   };
-  fs.writeFileSync(path.join(root, 'package.json'), JSON.stringify(packageJson));
+  fs.writeFileSync(
+    path.join(root, 'package.json'),
+    JSON.stringify(packageJson, null, 2)
+  );
   var originalDirectory = process.cwd();
   process.chdir(root);
 

package.json

@@ -11,10 +11,11 @@
     "url": "https://github.com/facebookincubator/create-react-app/issues"
   },
   "scripts": {
-    "start": "node scripts/start.js --debug-template",
     "build": "node scripts/build.js --debug-template",
     "create-react-app": "node global-cli/index.js --scripts-version \"$PWD/`npm pack`\"",
-    "test": "tasks/e2e.sh"
+    "e2e": "tasks/e2e.sh",
+    "start": "node scripts/start.js --debug-template",
+    "test": "node scripts/test.js --debug-template"
   },
   "files": [
     "PATENTS",
@@ -30,6 +31,7 @@
     "autoprefixer": "6.3.7",
     "babel-core": "6.11.4",
     "babel-eslint": "6.1.2",
+    "babel-jest": "14.1.0",
     "babel-loader": "6.2.4",
     "babel-plugin-syntax-trailing-function-commas": "6.8.0",
     "babel-plugin-transform-class-properties": "6.11.5",
@@ -57,6 +59,7 @@
     "fs-extra": "0.30.0",
     "gzip-size": "3.0.0",
     "html-webpack-plugin": "2.22.0",
+    "jest": "14.1.0",
     "json-loader": "0.5.4",
     "opn": "4.0.2",
     "postcss-loader": "0.9.1",
@@ -70,8 +73,9 @@
   },
   "devDependencies": {
     "bundle-deps": "1.0.0",
-    "react": "^15.2.1",
-    "react-dom": "^15.2.1"
+    "react": "^15.3.0",
+    "react-dom": "^15.3.0",
+    "react-test-renderer": "^15.3.0"
   },
   "optionalDependencies": {
     "fsevents": "1.0.14"

scripts/eject.js

@@ -7,11 +7,12 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
+var createJestConfig = require('./utils/create-jest-config');
 var fs = require('fs');
 var path = require('path');
+var prompt = require('./utils/prompt');
 var rimrafSync = require('rimraf').sync;
 var spawnSync = require('cross-spawn').sync;
-var prompt = require('./utils/prompt');
 
 prompt(
   'Are you sure you want to eject? This action is permanent.',
@@ -37,6 +38,9 @@ prompt(
     path.join('config', 'polyfills.js'),
     path.join('config', 'webpack.config.dev.js'),
     path.join('config', 'webpack.config.prod.js'),
+    path.join('config', 'jest', 'CSSStub.js'),
+    path.join('config', 'jest', 'FileStub.js'),
+    path.join('config', 'jest', 'transform.js'),
     path.join('scripts', 'build.js'),
     path.join('scripts', 'start.js'),
     path.join('scripts', 'utils', 'chrome.applescript'),
@@ -59,6 +63,7 @@ prompt(
   // Copy the files over
   fs.mkdirSync(path.join(appPath, 'config'));
   fs.mkdirSync(path.join(appPath, 'config', 'flow'));
+  fs.mkdirSync(path.join(appPath, 'config', 'jest'));
   fs.mkdirSync(path.join(appPath, 'scripts'));
   fs.mkdirSync(path.join(appPath, 'scripts', 'utils'));
 
@@ -96,6 +101,11 @@ prompt(
   });
   delete appPackage.scripts['eject'];
 
+  appPackage.scripts.test = 'jest';
+  appPackage.jest = createJestConfig(
+    filePath => path.join('<rootDir>', filePath)
+  );
+
   // explicitly specify ESLint config path for editor plugins
   appPackage.eslintConfig = {
     extends: './config/eslint.js',

scripts/init.js

@@ -19,13 +19,17 @@ module.exports = function(appPath, appName, verbose, originalDirectory) {
 
   // Copy over some of the devDependencies
   appPackage.dependencies = appPackage.dependencies || {};
+  appPackage.devDependencies = appPackage.devDependencies || {};
   ['react', 'react-dom'].forEach(function (key) {
     appPackage.dependencies[key] = ownPackage.devDependencies[key];
   });
+  ['react-test-renderer'].forEach(function (key) {
+    appPackage.devDependencies[key] = ownPackage.devDependencies[key];
+  });
 
   // Setup the script rules
   appPackage.scripts = {};
-  ['start', 'build', 'eject'].forEach(function(command) {
+  ['start', 'build', 'eject', 'test'].forEach(function(command) {
     appPackage.scripts[command] = 'react-scripts ' + command;
   });
 

scripts/test.js

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+process.env.NODE_ENV = 'test';
+
+const createJestConfig = require('./utils/create-jest-config');
+const jest = require('jest');
+const path = require('path');
+const paths = require('../config/paths');
+
+const argv = process.argv.slice(2);
+
+const index = argv.indexOf('--debug-template');
+if (index !== -1) {
+  argv.splice(index, 1);
+}
+
+argv.push('--config', JSON.stringify(createJestConfig(
+  relativePath => path.resolve(__dirname, '..', relativePath),
+  path.resolve(paths.appSrc, '..')
+)));
+
+jest.run(argv);

scripts/utils/create-jest-config.js

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+module.exports = (resolve, rootDir) => {
+  const config = {
+    automock: false,
+    moduleNameMapper: {
+      '^[./a-zA-Z0-9$_-]+\\.(jpg|png|gif|eot|svg|ttf|woff|woff2|mp4|webm)$': resolve('config/jest/FileStub.js'),
+      '^[./a-zA-Z0-9$_-]+\\.css$': resolve('config/jest/CSSStub.js')
+    },
+    persistModuleRegistryBetweenSpecs: true,
+    scriptPreprocessor: resolve('config/jest/transform.js'),
+    setupFiles: [
+      resolve('config/polyfills.js')
+    ],
+    testEnvironment: 'node'
+  };
+  if (rootDir) {
+    config.rootDir = rootDir;
+  }
+  return config;
+};

tasks/e2e.sh

@@ -11,6 +11,7 @@ cd "$(dirname "$0")"
 function cleanup {
   echo 'Cleaning up.'
   cd $initial_path
+  rm ../template/src/__tests__/__snapshots__/App-test.js.snap
   rm -rf $temp_cli_path $temp_app_path
 }
 
@@ -38,6 +39,7 @@ set -x
 
 # npm pack the two directories to make sure they are valid npm modules
 initial_path=$PWD
+
 cd ..
 
 # A hacky way to avoid bundling dependencies.
@@ -65,6 +67,10 @@ test -e build/static/js/*.js
 test -e build/static/css/*.css
 test -e build/static/media/*.svg
 
+# Run tests
+npm run test
+test -e template/src/__tests__/__snapshots__/App-test.js.snap
+
 # Pack CLI
 cd global-cli
 npm install
@@ -90,6 +96,10 @@ test -e build/static/js/*.js
 test -e build/static/css/*.css
 test -e build/static/media/*.svg
 
+# Run tests
+npm run test
+test -e src/__tests__/__snapshots__/App-test.js.snap
+
 # Test the server
 npm start -- --smoke-test
 
@@ -103,6 +113,10 @@ test -e build/static/js/*.js
 test -e build/static/css/*.css
 test -e build/static/media/*.svg
 
+# Run tests
+npm run test
+test -e src/__tests__/__snapshots__/App-test.js.snap
+
 # Test the server
 npm start -- --smoke-test
 

template/src/__tests__/App-test.js

@@ -0,0 +1,11 @@
+import React from 'react';
+import App from '../App';
+import renderer from 'react-test-renderer';
+
+describe('App', () => {
+  it('renders a welcome view', () => {
+    const instance = renderer.create(<App />);
+    const tree = instance.toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+});