Implement jest as a test runner

build/jest-config.js

@@ -0,0 +1,14 @@
+/* eslint-env node */
+
+module.exports = {
+  cache: false,
+  rootDir: process.cwd(),
+  setupFiles: [
+    '<rootDir>/node_modules/fusion-cli/build/jest-framework-shims.js',
+    '<rootDir>/node_modules/fusion-cli/build/jest-framework-setup.js',
+  ],
+  transform: {
+    '^.+\\.js$': '<rootDir>/node_modules/fusion-cli/build/jest-transformer.js',
+  },
+  transformIgnorePatterns: ['/node_modules/(?!(fusion-cli.*build))'],
+};

build/jest-framework-setup.js

@@ -0,0 +1,10 @@
+/* eslint-env node */
+import {configure} from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+
+// Setup Enzyme for all Jest tests
+configure({adapter: new Adapter()});
+
+const testEnv = process.env.ENV || 'browser';
+global.__NODE__ = testEnv === 'node';
+global.__BROWSER__ = testEnv === 'browser';

build/jest-framework-shims.js

@@ -0,0 +1,4 @@
+/* eslint-env node */
+global.requestAnimationFrame = callback => {
+  setTimeout(callback, 0);
+};

build/jest-transformer.js

@@ -0,0 +1,23 @@
+/* eslint-env node */
+
+const transformer = require('babel-jest').createTransformer({
+  presets: [
+    'babel-preset-flow',
+    'babel-preset-es2015',
+    'babel-preset-react',
+  ].map(require.resolve),
+});
+
+const originalProcessFn = transformer.process;
+
+transformer.process = function(src, filename, config, transformOptions) {
+  return originalProcessFn.call(
+    transformer,
+    src,
+    filename,
+    config,
+    transformOptions
+  );
+};
+
+module.exports = transformer;

build/test-app-runtime.js

@@ -0,0 +1,46 @@
+/* eslint-env node */
+const path = require('path');
+const {spawn} = require('child_process');
+
+module.exports.TestAppRuntime = function({dir = '.'}) {
+  const state = {proc: null};
+
+  this.run = () => {
+    this.stop();
+
+    let command = require.resolve('jest-cli/bin/jest.js');
+    let args = [
+      '--no-cache',
+      '--config',
+      './node_modules/fusion-cli/build/jest-config.js',
+    ];
+
+    return new Promise((resolve, reject) => {
+      state.proc = spawn(command, args, {
+        cwd: path.resolve(process.cwd(), dir),
+        stdio: ['inherit', 'inherit', 'inherit', 'ipc'],
+        env: Object.assign({}, process.env),
+      });
+
+      state.proc.on('error', reject);
+      state.proc.on('exit', (code, signal) => {
+        if (code) {
+          return reject(new Error(`Test exited with code ${code}`));
+        }
+
+        if (signal) {
+          return reject(new Error(`Test process exited with signal ${signal}`));
+        }
+
+        return resolve();
+      });
+    });
+  };
+
+  this.stop = () => {
+    if (state.proc) {
+      state.proc.kill();
+      state.proc = null;
+    }
+  };
+};

commands/test-app.js

@@ -0,0 +1,28 @@
+/* eslint-env node */
+const {TestAppRuntime} = require('../build/test-app-runtime');
+
+exports.desc = 'Run browser tests, using Jest';
+exports.builder = {
+  dir: {
+    type: 'string',
+    default: '.',
+    describe: 'Root path for the application relative to CLI CWD',
+  },
+  watch: {
+    type: 'boolean',
+    default: false,
+    describe: 'Automatically re-profile your application on changes',
+  },
+};
+
+exports.run = async function({dir = '.', watch}) {
+  const testRuntime = new TestAppRuntime({dir, watch});
+
+  await testRuntime.run();
+
+  return {
+    stop() {
+      testRuntime.stop();
+    },
+  };
+};

package.json

@@ -12,25 +12,30 @@
   },
   "dependencies": {
     "@nadiia/file-loader": "^1.0.0-beta.5",
-    "babel-core": "^6.22.1",
+    "babel-core": "^6.26.0",
+    "babel-jest": "^21.2.0",
     "babel-loader": "^7.1.0",
     "babel-plugin-external-helpers": "^6.22.0",
-    "babel-plugin-istanbul": "^4.0.0",
+    "babel-plugin-istanbul": "^4.1.5",
     "babel-plugin-syntax-dynamic-import": "^6.18.0",
     "babel-plugin-transform-async-generator-functions": "^6.22.0",
     "babel-plugin-transform-class-properties": "^6.23.0",
     "babel-plugin-transform-cup-globals": "^1.0.0-rc.2",
     "babel-plugin-transform-object-rest-spread": "^6.23.0",
     "babel-plugin-transform-react-jsx": "^6.23.0",
     "babel-preset-env": "^1.1.8",
+    "babel-preset-es2015": "^6.24.1",
     "babel-preset-flow": "^6.23.0",
+    "babel-preset-jest": "^21.2.0",
     "babel-preset-react": "^6.23.0",
     "browser-unhandled-rejection": "^1.0.1",
     "case-sensitive-paths-webpack-plugin": "^1.1.4",
     "chalk": "^1.1.3",
     "compose-middleware": "3.0.0",
     "compression-webpack-plugin": "^0.4.0",
     "core-js": "^2.5.1",
+    "enzyme": "^3.2.0",
+    "enzyme-adapter-react-16": "^1.1.0",
     "es6-object-assign": "^1.1.0",
     "express": "^4.15.2",
     "fast-async": "^6.3.0",
@@ -39,6 +44,8 @@
     "iltorb": "^1.3.1",
     "imagemin": "^5.3.1",
     "imagemin-svgo": "^5.2.2",
+    "jest": "^21.2.1",
+    "jest-cli": "^21.2.1",
     "just-snake-case": "^1.0.0",
     "koa": "^2.3.0",
     "koa-mount": "^3.0.0",