diff --git a/docs/docs/addons.md b/docs/docs/addons.md
index de05678924631..c9ac2ea787e30 100644
--- a/docs/docs/addons.md
+++ b/docs/docs/addons.md
@@ -12,8 +12,7 @@ The React add-ons are a collection of useful utility modules for building React
 The add-ons below are in the development (unminified) version of React only:
 
 - [`Perf`](perf.html), a performance profiling tool for finding optimization opportunities.
-- [`ReactTestUtils`](test-utils.html), simple helpers for writing test
-  cases.
+- [`ReactTestUtils`](test-utils.html), simple helpers for writing test cases.
 
 ### Legacy Add-ons
 
diff --git a/src/addons/__tests__/ReactDOMFactories-test.js b/src/addons/__tests__/ReactDOMFactories-test.js
index 272c1923dc060..df43b1d20d382 100644
--- a/src/addons/__tests__/ReactDOMFactories-test.js
+++ b/src/addons/__tests__/ReactDOMFactories-test.js
@@ -11,9 +11,6 @@
 
 'use strict';
 
-var React = require('React');
-var ReactDOM = require('ReactDOM');
-var ReactTestUtils = require('ReactTestUtils');
 var {div} = require('ReactDOMFactories');
 
 describe('ReactDOMFactories', () => {
@@ -25,40 +22,4 @@ describe('ReactDOMFactories', () => {
     expectDev(console.error.calls.count()).toBe(0);
   });
 
-  it('identifies valid elements', () => {
-    var Component = React.createClass({
-      render: function() {
-        return React.createElement('div');
-      },
-    });
-    expect(React.isValidElement(div)).toEqual(false);
-  });
-
-  it('identifies elements, but not JSON, if Symbols are supported', () => {
-    // Rudimentary polyfill
-    // Once all jest engines support Symbols natively we can swap this to test
-    // WITH native Symbols by default.
-    var REACT_ELEMENT_TYPE = function() {}; // fake Symbol
-    var OTHER_SYMBOL = function() {}; // another fake Symbol
-    global.Symbol = function(name) {
-      return OTHER_SYMBOL;
-    };
-    global.Symbol.for = function(key) {
-      if (key === 'react.element') {
-        return REACT_ELEMENT_TYPE;
-      }
-      return OTHER_SYMBOL;
-    };
-
-    jest.resetModuleRegistry();
-
-    React = require('React');
-
-    var Component = React.createClass({
-      render: function() {
-        return React.createElement('div');
-      },
-    });
-    expect(React.isValidElement(div)).toEqual(false);
-  });
 });
diff --git a/src/isomorphic/classic/element/__tests__/ReactElement-test.js b/src/isomorphic/classic/element/__tests__/ReactElement-test.js
index 0ffabd50a43ac..41066734027d3 100644
--- a/src/isomorphic/classic/element/__tests__/ReactElement-test.js
+++ b/src/isomorphic/classic/element/__tests__/ReactElement-test.js
@@ -353,6 +353,7 @@ describe('ReactElement', () => {
     expect(React.isValidElement(true)).toEqual(false);
     expect(React.isValidElement({})).toEqual(false);
     expect(React.isValidElement('string')).toEqual(false);
+    expect(React.isValidElement(React.createFactory('div'))).toEqual(false);
     expect(React.isValidElement(Component)).toEqual(false);
     expect(React.isValidElement({ type: 'div', props: {} })).toEqual(false);
 
@@ -516,6 +517,7 @@ describe('ReactElement', () => {
     expect(React.isValidElement(true)).toEqual(false);
     expect(React.isValidElement({})).toEqual(false);
     expect(React.isValidElement('string')).toEqual(false);
+    expect(React.isValidElement(React.createFactory('div'))).toEqual(false);
     expect(React.isValidElement(Component)).toEqual(false);
     expect(React.isValidElement({ type: 'div', props: {} })).toEqual(false);
 
@@ -598,7 +600,13 @@ describe('comparing jsx vs .createFactory() vs .createElement()', () => {
     beforeEach(() => {
       var Parent = React.createClass({
         render: function() {
-          return React.createElement('div', {}, React.createElement(Child, { ref: 'child', foo: 'foo value' }, 'children value'));
+          return (
+            React.createElement('div', null,
+              React.createElement(Child, {
+                ref: 'child',
+                foo: 'foo value',
+              }, 'children value'))
+          );
         },
       });
       factory = React.createFactory(Parent);