[added] testing-utils

Summary:
Gives us a place to put testing utilities.  I also expect to put `useMockedRAF` here, removing the need for `waitAFrame`.  That work is currently blocked on the landing of FormidableLabs/mock-raf#6

If that doesn't land, I'll fork mock-raf and add it here too.

Reviewers: O3 Material JavaScript platform reviewers, #material_motion, O2 Material Motion, featherless

Reviewed By: #material_motion, O2 Material Motion, featherless

Tags: #material_motion

Differential Revision: http://codereview.cc/D2411

packages/testing-utils/README.md

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+# Material Motion Testing Utils #
+
+Utilities for testing the Material Motion framework
+
+## Usage ##
+
+```javascript
+import {
+  createMockObserver,
+} from 'material-motion-testing-utils';
+
+const mockObserver = createMockObserver();
+
+const someStream = new MotionObservable(mockObserver);
+someStream.subscribe(someListener);
+mockObserver.next(5);
+expect(someListener).to.have.been.calledWith(5);
+```
+
+## Installation ##
+
+```
+yarn add material-motion-testing-utils
+```
+
+## License ##
+
+[Apache 2.0](http://www.apache.org/licenses/LICENSE-2.0)

packages/testing-utils/package.json

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+{
+  "name": "material-motion-testing-utils",
+  "version": "0.0.0",
+  "description": "Utilities for testing the Material Motion framework",
+  "main": "dist/index.js",
+  "types": "src/index.ts",
+  "scripts": {
+    "clean": "rm -rf ./dist/*; mkdir -p ./dist/",
+    "build": "yarn run clean; ../../node_modules/.bin/tsc"
+  },
+  "peerDependencies": {
+    "sinon": "2.0.0-pre.3"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@github.com:material-motion/material-motion-js.git"
+  },
+  "keywords": [
+    "animation",
+    "gestures",
+    "interactive",
+    "material",
+    "motion",
+    "multitouch",
+    "observables",
+    "odeon",
+    "physics",
+    "springs",
+    "touch",
+    "transitions",
+    "tweens"
+  ],
+  "author": "The Material Motion Authors (see AUTHORS)",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/material-motion/material-motion-js/issues/"
+  },
+  "homepage": "https://github.com/material-motion/material-motion-js/tree/develop/packages/testing-utils/#readme"
+}

packages/testing-utils/src/createMockObserver.ts

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+/** @license
+ *  Copyright 2016 - present The Material Motion Authors. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ *  use this file except in compliance with the License. You may obtain a copy
+ *  of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ */
+
+import {
+  stub,
+} from 'sinon';
+
+export default function createMockObserver() {
+  return new MockObserver();
+}
+
+export class MockObserver {
+  next?: Function;
+  state?: Function;
+  disconnect = stub();
+
+  connect = (observer) => {
+    this.next = observer.next;
+    this.state = observer.state;
+
+    return this.disconnect;
+  }
+}

packages/testing-utils/src/index.ts

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+/** @license
+ *  Copyright 2016 - present The Material Motion Authors. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ *  use this file except in compliance with the License. You may obtain a copy
+ *  of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ */
+
+export * from './createMockObserver';
+export { default as createMockObserver } from './createMockObserver';

packages/testing-utils/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "include": ["./src/**/*"],
+  "exclude": [],
+  "compilerOptions": {
+    "outDir": "dist",
+    "rootDir": "src",
+    "noImplicitAny": false,
+    "noImplicitThis": false,
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "strictNullChecks": false
+  }
+}