Test utils deprecations and updates:

1. Moved react-addons-test-utils to react-dom/test-utils and added deprecation message.
2. Moved shallow renderer (previous accessible via TestUtils.createRenderer) to react-test-renderer/shallow and added deprecation message.
3. Updated READMEs for react-addons-test-utils and react-test-renderer

addons/react-addons-test-utils/LICENSE

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+BSD License
+
+For React software
+
+Copyright (c) 2013-present, Facebook, Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+ * Neither the name Facebook nor the names of its contributors may be used to
+   endorse or promote products derived from this software without specific
+   prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

addons/react-addons-test-utils/PATENTS

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+Additional Grant of Patent Rights Version 2
+
+"Software" means the React software distributed by Facebook, Inc.
+
+Facebook, Inc. ("Facebook") hereby grants to each recipient of the Software
+("you") a perpetual, worldwide, royalty-free, non-exclusive, irrevocable
+(subject to the termination provision below) license under any Necessary
+Claims, to make, have made, use, sell, offer to sell, import, and otherwise
+transfer the Software. For avoidance of doubt, no license is granted under
+Facebook's rights in any patent claims that are infringed by (i) modifications
+to the Software made by you or any third party or (ii) the Software in
+combination with any software or other technology.
+
+The license granted hereunder will terminate, automatically and without notice,
+if you (or any of your subsidiaries, corporate affiliates or agents) initiate
+directly or indirectly, or take a direct financial interest in, any Patent
+Assertion: (i) against Facebook or any of its subsidiaries or corporate
+affiliates, (ii) against any party if such Patent Assertion arises in whole or
+in part from any software, technology, product or service of Facebook or any of
+its subsidiaries or corporate affiliates, or (iii) against any party relating
+to the Software. Notwithstanding the foregoing, if Facebook or any of its
+subsidiaries or corporate affiliates files a lawsuit alleging patent
+infringement against you in the first instance, and you respond by filing a
+patent infringement counterclaim in that lawsuit against that party that is
+unrelated to the Software, the license granted hereunder will not terminate
+under section (i) of this paragraph due to such counterclaim.
+
+A "Necessary Claim" is a claim of a patent owned by Facebook that is
+necessarily infringed by the Software standing alone.
+
+A "Patent Assertion" is any lawsuit or other action alleging direct, indirect,
+or contributory infringement or inducement to infringe any patent, including a
+cross-claim or counterclaim.

addons/react-addons-test-utils/README.md

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+# react-addons-test-utils
+
+This package provides the React TestUtils add-on.
+
+See <https://facebook.github.io/react/docs/test-utils.html> for more information.
+
+This package is deprecated as of version 15.5.0:
+* TestUtils have been moved to `react-dom/test-utils`
+* Shallow renderer has been moved to `react-test-renderer/shallow`

addons/react-addons-test-utils/index.js

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+/**
+ * Copyright 2013-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.
+ */
+
+'use strict';
+
+// This package has been deprecated in NPM as of version 15.5.0
+// But NPM deprecation warnings are easy to overlook
+// So a more explicit runtime warning seemed appropriate
+console.error(
+  'ReactTestUtils has been moved to react-dom/test-utils. ' +
+  'Update references to remove this warning.'
+);
+
+module.exports = require('react-dom/lib/ReactTestUtils');

addons/react-addons-test-utils/package.json

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+{
+  "name": "react-addons-test-utils",
+  "version": "15.5.0",
+  "main": "index.js",
+  "repository": "facebook/react",
+  "keywords": [
+    "react",
+    "react-addon"
+  ],
+  "license": "BSD-3-Clause",
+  "dependencies": {
+    "fbjs": "^0.8.4",
+    "object-assign": "^4.1.0"
+  },
+  "peerDependencies": {
+    "react-dom": "^15.4.2"
+  },
+  "devDependencies": {
+    "jest": "^19.0.2",
+    "react": "^15.4.2",
+    "react-dom": "^15.4.2"
+  },
+  "files": [
+    "LICENSE",
+    "PATENTS",
+    "README.md",
+    "index.js"
+  ]
+}

addons/react-addons-test-utils/test.js

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+/**
+ * Copyright 2013-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.
+ *
+ * @emails react-core
+ */
+
+'use strict';
+
+describe('ReactTestUtils', function() {
+  let ReactTestUtils;
+  let React;
+
+  beforeEach(function() {
+    spyOn(console, 'error');
+
+    React = require('react');
+    ReactTestUtils = require('./index');
+  });
+
+  it('should warn on include', function() {
+    expect(console.error).toHaveBeenCalledWith(
+      'ReactTestUtils has been moved to react-dom/test-utils. ' +
+      'Update references to remove this warning.'
+    );
+  });
+
+  it('should pass a basic smoke test', function() {
+    const ReactTestUtils = require('./index');
+    const onClick = jest.fn();
+
+    class MyComponent extends React.Component {
+      constructor(props, context) {
+        super(props, context);
+        this.state = { bar: 123 };
+      }
+      render() {
+        return <div onClick={onClick}>{this.props.baz}</div>;
+      }
+    }
+
+    const instance = ReactTestUtils.renderIntoDocument(
+      <MyComponent baz='abc' />
+    );
+
+    expect(instance.state.bar).toBe(123);
+    expect(instance.props.baz).toBe('abc');
+
+    const div = ReactTestUtils.findRenderedDOMComponentWithTag(instance, 'div');
+    expect(div.textContent).toBe('abc');
+
+    expect(onClick).not.toHaveBeenCalled();
+    ReactTestUtils.Simulate.click(div);
+    expect(onClick).toHaveBeenCalled();
+  });
+});