Add fixtures folder

fixtures/kitchensink/.env.development

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+INFERNO_APP_X = x-from-development-env
+INFERNO_APP_DEVELOPMENT = development

fixtures/kitchensink/.env.local

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+INFERNO_APP_X = x-from-original-local-env
+INFERNO_APP_ORIGINAL_2 = override-from-original-local-env-2

fixtures/kitchensink/.env.production

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+INFERNO_APP_X = x-from-production-env
+INFERNO_APP_PRODUCTION = production

fixtures/kitchensink/src/features/env/PublicUrl.test.js

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+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import { render } from 'inferno';
+import PublicUrl from './PublicUrl';
+
+describe('PUBLIC_URL', () => {
+  it('renders without crashing', () => {
+    const div = document.createElement('div');
+    render(<PublicUrl />, div);
+  });
+});

fixtures/kitchensink/src/features/webpack/LinkedModules.js

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+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import Inferno from 'inferno';
+import './assets/style.css';
+import { test, version } from 'test-integrity';
+
+export default () => {
+  const v = version();
+  if (!test() || v !== '2.0.0') {
+    throw new Error('Functionality test did not pass.');
+  }
+  return <p id="feature-linked-modules">{v}</p>;
+};

fixtures/kitchensink/src/features/webpack/LinkedModules.test.js

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+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import Inferno from 'inferno';
+import InfernoDOM from 'inferno-dom';
+import { test, version } from 'test-integrity';
+import LinkedModules from './LinkedModules';
+
+describe('linked modules', () => {
+  it('has integrity', () => {
+    expect(test());
+    expect(version() === '2.0.0');
+  });
+
+  it('renders without crashing', () => {
+    const div = document.createElement('div');
+    InfernoDOM.render(<LinkedModules />, div);
+  });
+});

fixtures/kitchensink/src/index.js

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+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import { render } from 'inferno';
+import App from './App';
+
+render(<App />, document.getElementById('root'));