{"files":[{"path":"src\/addons\/__tests__\/ReactFragment-test.js","status":"M"},{"path":"src\/addons\/transitions\/__tests__\/ReactCSSTransitionGroup-test.js","status":"M"},{"path":"src\/browser\/__tests__\/ReactBrowserEventEmitter-test.js","status":"M"},{"path":"src\/browser\/__tests__\/ReactDOM-test.js","status":"M"},{"path":"src\/browser\/eventPlugins\/__tests__\/AnalyticsEventPlugin-test.js","status":"M"},{"path":"src\/browser\/server\/__tests__\/ReactServerRendering-test.js","status":"M"},{"path":"src\/browser\/ui\/__tests__\/ReactDOMComponent-test.js","status":"M"},{"path":"src\/browser\/ui\/__tests__\/ReactMount-test.js","status":"M"},{"path":"src\/browser\/ui\/dom\/__tests__\/CSSPropertyOperations-test.js","status":"M"},{"path":"src\/browser\/ui\/dom\/__tests__\/DOMPropertyOperations-test.js","status":"M"},{"path":"src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMInput-test.js","status":"M"},{"path":"src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMTextarea-test.js","status":"M"},{"path":"src\/classic\/__tests__\/ReactContextValidator-test.js","status":"M"},{"path":"src\/classic\/class\/__tests__\/ReactBind-test.js","status":"M"},{"path":"src\/classic\/class\/__tests__\/ReactClass-test.js","status":"M"},{"path":"src\/classic\/element\/__tests__\/ReactElement-test.js","status":"M"},{"path":"src\/classic\/element\/__tests__\/ReactElementClone-test.js","status":"M"},{"path":"src\/classic\/element\/__tests__\/ReactElementValidator-test.js","status":"M"},{"path":"src\/classic\/types\/__tests__\/ReactPropTypes-test.js","status":"M"},{"path":"src\/core\/__tests__\/ReactComponentLifeCycle-test.js","status":"M"},{"path":"src\/core\/__tests__\/ReactCompositeComponent-test.js","status":"M"},{"path":"src\/core\/__tests__\/ReactMockedComponent-test.js","status":"M"},{"path":"src\/modern\/class\/__tests__\/ReactCoffeeScriptClass-test.coffee","status":"M"},{"path":"src\/modern\/class\/__tests__\/ReactES6Class-test.js","status":"M"},{"path":"src\/modern\/class\/__tests__\/ReactTypeScriptClass-test.ts","status":"M"},{"path":"src\/modern\/element\/__tests__\/ReactJSXElement-test.js","status":"M"},{"path":"src\/modern\/element\/__tests__\/ReactJSXElementValidator-test.js","status":"M"},{"path":"src\/test\/__tests__\/ReactTestUtils-test.js","status":"M"},{"path":"src\/utils\/__tests__\/ReactChildren-test.js","status":"M"},{"path":"src\/utils\/__tests__\/cloneWithProps-test.js","status":"M"},{"path":"src\/utils\/__tests__\/traverseAllChildren-test.js","status":"M"},{"path":"src\/vendor\/core\/warning.js","status":"M"}],"body":"Better version of #3277.\n\nTest Plan: jest, grunt test","patch":"diff --git a\/src\/addons\/__tests__\/ReactFragment-test.js b\/src\/addons\/__tests__\/ReactFragment-test.js\nindex 6570b43347..d53e6020de 100644\n--- a\/src\/addons\/__tests__\/ReactFragment-test.js\n+++ b\/src\/addons\/__tests__\/ReactFragment-test.js\n@@ -22,14 +22,14 @@ describe('ReactFragment', function() {\n });\n \n it('should warn if a plain object is used as a child', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n var children = {\n x: ,\n y: \n };\n

{children}<\/div>;\n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.calls[0].args[0]).toContain(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.calls[0].args[0]).toContain(\n 'Any use of a keyed object'\n );\n \/\/ Only warn once for the same set of children\n@@ -38,28 +38,28 @@ describe('ReactFragment', function() {\n y: \n };\n

{sameChildren}<\/div>;\n- expect(console.warn.calls.length).toBe(1);\n+ expect(console.error.calls.length).toBe(1);\n });\n \n it('should warn if a plain object even if it is deep', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n var children = {\n x: ,\n y: ,\n z: \n };\n var element =

{[children]}<\/div>;\n- expect(console.warn.calls.length).toBe(0);\n+ expect(console.error.calls.length).toBe(0);\n var container = document.createElement('div');\n React.render(element, container);\n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.calls[0].args[0]).toContain(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.calls[0].args[0]).toContain(\n 'Any use of a keyed object'\n );\n });\n \n it('should warn if accessing any property on a fragment', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n var children = {\n x: ,\n y: \n@@ -67,35 +67,35 @@ describe('ReactFragment', function() {\n var frag = ReactFragment.create(children);\n frag.x;\n frag.y = 10;\n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.calls[0].args[0]).toContain(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.calls[0].args[0]).toContain(\n 'A ReactFragment is an opaque type'\n );\n });\n \n it('should warn if passing null to createFragment', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n ReactFragment.create(null);\n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.calls[0].args[0]).toContain(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.calls[0].args[0]).toContain(\n 'React.addons.createFragment only accepts a single object.'\n );\n });\n \n it('should warn if passing an array to createFragment', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n ReactFragment.create([]);\n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.calls[0].args[0]).toContain(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.calls[0].args[0]).toContain(\n 'React.addons.createFragment only accepts a single object.'\n );\n });\n \n it('should warn if passing a ReactElement to createFragment', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n ReactFragment.create(

);\n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.calls[0].args[0]).toContain(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.calls[0].args[0]).toContain(\n 'React.addons.createFragment does not accept a ReactElement without a ' +\n 'wrapper object.'\n );\ndiff --git a\/src\/addons\/transitions\/__tests__\/ReactCSSTransitionGroup-test.js b\/src\/addons\/transitions\/__tests__\/ReactCSSTransitionGroup-test.js\nindex 5528a7042f..9ddcd78ace 100644\n--- a\/src\/addons\/transitions\/__tests__\/ReactCSSTransitionGroup-test.js\n+++ b\/src\/addons\/transitions\/__tests__\/ReactCSSTransitionGroup-test.js\n@@ -26,7 +26,7 @@ describe('ReactCSSTransitionGroup', function() {\n mocks = require('mocks');\n \n container = document.createElement('div');\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n });\n \n it('should warn after time with no transitionend', function() {\n@@ -60,7 +60,7 @@ describe('ReactCSSTransitionGroup', function() {\n }\n \n expect(React.findDOMNode(a).childNodes.length).toBe(2);\n- expect(console.warn.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall.length).toBe(1);\n });\n \n it('should keep both sets of DOM nodes around', function() {\ndiff --git a\/src\/browser\/__tests__\/ReactBrowserEventEmitter-test.js b\/src\/browser\/__tests__\/ReactBrowserEventEmitter-test.js\nindex bc27a94dab..10eb6bda68 100644\n--- a\/src\/browser\/__tests__\/ReactBrowserEventEmitter-test.js\n+++ b\/src\/browser\/__tests__\/ReactBrowserEventEmitter-test.js\n@@ -262,12 +262,12 @@ describe('ReactBrowserEventEmitter', function() {\n ON_CLICK_KEY,\n recordID.bind(null, getID(GRANDPARENT))\n );\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n ReactTestUtils.Simulate.click(CHILD);\n expect(idCallOrder.length).toBe(1);\n expect(idCallOrder[0]).toBe(getID(CHILD));\n- expect(console.warn.calls.length).toEqual(1);\n- expect(console.warn.calls[0].args[0]).toBe(\n+ expect(console.error.calls.length).toEqual(1);\n+ expect(console.error.calls[0].args[0]).toBe(\n 'Warning: Returning `false` from an event handler is deprecated and ' +\n 'will be ignored in a future release. Instead, manually call ' +\n 'e.stopPropagation() or e.preventDefault(), as appropriate.'\ndiff --git a\/src\/browser\/__tests__\/ReactDOM-test.js b\/src\/browser\/__tests__\/ReactDOM-test.js\nindex 0ec35e515a..eaa370df60 100644\n--- a\/src\/browser\/__tests__\/ReactDOM-test.js\n+++ b\/src\/browser\/__tests__\/ReactDOM-test.js\n@@ -113,10 +113,10 @@ describe('ReactDOM', function() {\n });\n \n it('allow React.DOM factories to be called without warnings', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n var element = React.DOM.div();\n expect(element.type).toBe('div');\n- expect(console.warn.argsForCall.length).toBe(0);\n+ expect(console.error.argsForCall.length).toBe(0);\n });\n \n });\ndiff --git a\/src\/browser\/eventPlugins\/__tests__\/AnalyticsEventPlugin-test.js b\/src\/browser\/eventPlugins\/__tests__\/AnalyticsEventPlugin-test.js\nindex d02f2dc587..64c04d1e93 100644\n--- a\/src\/browser\/eventPlugins\/__tests__\/AnalyticsEventPlugin-test.js\n+++ b\/src\/browser\/eventPlugins\/__tests__\/AnalyticsEventPlugin-test.js\n@@ -53,7 +53,7 @@ describe('AnalyticsEventPlugin', function() {\n 'ChangeEventPlugin': ChangeEventPlugin\n });\n \n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n });\n \n it('should count events correctly', function() {\n@@ -107,8 +107,8 @@ describe('AnalyticsEventPlugin', function() {\n \n it('warn on no callback', function() {\n AnalyticsEventPluginFactory.createAnalyticsPlugin(null);\n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toBe(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toBe(\n 'Warning: createAnalyticsPlugin(...): You must provide a callback.'\n );\n });\n@@ -138,8 +138,8 @@ describe('AnalyticsEventPlugin', function() {\n \n ReactTestUtils.SimulateNative.click(renderedComponent.refs.testDiv);\n \n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toBe(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toBe(\n 'Warning: Invalid analyticsEvent:123 for analyticsID:test_invalid_events'\n );\n });\ndiff --git a\/src\/browser\/server\/__tests__\/ReactServerRendering-test.js b\/src\/browser\/server\/__tests__\/ReactServerRendering-test.js\nindex de9990fd2e..5fabc72672 100644\n--- a\/src\/browser\/server\/__tests__\/ReactServerRendering-test.js\n+++ b\/src\/browser\/server\/__tests__\/ReactServerRendering-test.js\n@@ -48,7 +48,7 @@ describe('ReactServerRendering', function() {\n \n var DOMProperty = require('DOMProperty');\n ID_ATTRIBUTE_NAME = DOMProperty.ID_ATTRIBUTE_NAME;\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n });\n \n describe('renderToString', function() {\n@@ -219,7 +219,7 @@ describe('ReactServerRendering', function() {\n element.innerHTML = lastMarkup;\n var instance = React.render(, element);\n expect(mountCount).toEqual(4);\n- expect(console.warn.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall.length).toBe(1);\n expect(element.innerHTML.length > 0).toBe(true);\n expect(element.innerHTML).not.toEqual(lastMarkup);\n \ndiff --git a\/src\/browser\/ui\/__tests__\/ReactDOMComponent-test.js b\/src\/browser\/ui\/__tests__\/ReactDOMComponent-test.js\nindex 2f99e48453..706932b370 100644\n--- a\/src\/browser\/ui\/__tests__\/ReactDOMComponent-test.js\n+++ b\/src\/browser\/ui\/__tests__\/ReactDOMComponent-test.js\n@@ -344,18 +344,18 @@ describe('ReactDOMComponent', function() {\n });\n \n it(\"should warn against children for void elements\", function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n var container = document.createElement('div');\n \n React.render(children<\/input>, container);\n \n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('void element');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('void element');\n });\n \n it(\"should warn against dangerouslySetInnerHTML for void elements\", function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n var container = document.createElement('div');\n \n@@ -364,12 +364,12 @@ describe('ReactDOMComponent', function() {\n container\n );\n \n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('void element');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('void element');\n });\n \n it(\"should treat menuitem as a void element but still create the closing tag\", function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n var container = document.createElement('div');\n \n@@ -379,8 +379,8 @@ describe('ReactDOMComponent', function() {\n \n React.render(children<\/menuitem>, container);\n \n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('void element');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('void element');\n });\n \n it(\"should validate against multiple children props\", function() {\n@@ -394,10 +394,10 @@ describe('ReactDOMComponent', function() {\n \n it('should validate against use of innerHTML', function() {\n \n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n mountComponent({innerHTML: 'Hi Jim!<\/span>'});\n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain(\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain(\n 'Directly setting property `innerHTML` is not permitted. '\n );\n });\n@@ -423,10 +423,10 @@ describe('ReactDOMComponent', function() {\n });\n \n it(\"should warn about contentEditable and children\", function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n mountComponent({contentEditable: true, children: ''});\n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('contentEditable');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('contentEditable');\n });\n \n it(\"should validate against invalid styles\", function() {\n@@ -503,17 +503,17 @@ describe('ReactDOMComponent', function() {\n });\n \n it(\"should warn against children for void elements\", function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n React.render(, container);\n React.render(children<\/input>, container);\n \n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('void element');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('void element');\n });\n \n it(\"should warn against dangerouslySetInnerHTML for void elements\", function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n React.render(, container);\n React.render(\n@@ -521,8 +521,8 @@ describe('ReactDOMComponent', function() {\n container\n );\n \n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('void element');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('void element');\n });\n \n it(\"should validate against multiple children props\", function() {\n@@ -540,13 +540,13 @@ describe('ReactDOMComponent', function() {\n });\n \n it(\"should warn about contentEditable and children\", function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n React.render(\n

<\/div>,\n container\n );\n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('contentEditable');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('contentEditable');\n });\n \n it(\"should validate against invalid styles\", function() {\n@@ -620,10 +620,10 @@ describe('ReactDOMComponent', function() {\n var React = require('React');\n var ReactTestUtils = require('ReactTestUtils');\n \n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n ReactTestUtils.renderIntoDocument(

);\n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.mostRecentCall.args[0]).toBe(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.mostRecentCall.args[0]).toBe(\n 'Warning: This browser doesn\\'t support the `onScroll` event'\n );\n });\ndiff --git a\/src\/browser\/ui\/__tests__\/ReactMount-test.js b\/src\/browser\/ui\/__tests__\/ReactMount-test.js\nindex fa4e3989df..43fedbccb3 100644\n--- a\/src\/browser\/ui\/__tests__\/ReactMount-test.js\n+++ b\/src\/browser\/ui\/__tests__\/ReactMount-test.js\n@@ -132,35 +132,35 @@ describe('ReactMount', function() {\n var container = document.createElement('container');\n container.innerHTML = React.renderToString(

) + ' ';\n \n- console.warn = mocks.getMockFunction();\n+ console.error = mocks.getMockFunction();\n ReactMount.render(

, container);\n- expect(console.warn.mock.calls.length).toBe(1);\n+ expect(console.error.mock.calls.length).toBe(1);\n \n container.innerHTML = ' ' + React.renderToString(

);\n \n- console.warn = mocks.getMockFunction();\n+ console.error = mocks.getMockFunction();\n ReactMount.render(

, container);\n- expect(console.warn.mock.calls.length).toBe(1);\n+ expect(console.error.mock.calls.length).toBe(1);\n });\n \n it('should not warn if mounting into non-empty node', function() {\n var container = document.createElement('container');\n container.innerHTML = '

<\/div>';\n \n- console.warn = mocks.getMockFunction();\n+ console.error = mocks.getMockFunction();\n ReactMount.render(

, container);\n- expect(console.warn.mock.calls.length).toBe(0);\n+ expect(console.error.mock.calls.length).toBe(0);\n });\n \n it('should warn when mounting into document.body', function () {\n var iFrame = document.createElement('iframe');\n document.body.appendChild(iFrame);\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n ReactMount.render(

, iFrame.contentDocument.body);\n \n- expect(console.warn.calls.length).toBe(1);\n- expect(console.warn.calls[0].args[0]).toContain(\n+ expect(console.error.calls.length).toBe(1);\n+ expect(console.error.calls[0].args[0]).toContain(\n 'Rendering components directly into document.body is discouraged'\n );\n });\ndiff --git a\/src\/browser\/ui\/dom\/__tests__\/CSSPropertyOperations-test.js b\/src\/browser\/ui\/dom\/__tests__\/CSSPropertyOperations-test.js\nindex 8c7c18e516..34a6f06b18 100644\n--- a\/src\/browser\/ui\/dom\/__tests__\/CSSPropertyOperations-test.js\n+++ b\/src\/browser\/ui\/dom\/__tests__\/CSSPropertyOperations-test.js\n@@ -109,18 +109,18 @@ describe('CSSPropertyOperations', function() {\n });\n \n it('should warn when using hyphenated style names', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n expect(CSSPropertyOperations.createMarkupForStyles({\n 'background-color': 'crimson'\n })).toBe('background-color:crimson;');\n \n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('backgroundColor');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('backgroundColor');\n });\n \n it('should warn when updating hyphenated style names', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n var root = document.createElement('div');\n var styles = {\n@@ -131,13 +131,13 @@ describe('CSSPropertyOperations', function() {\n React.render(

, root);\n React.render(

, root);\n \n- expect(console.warn.argsForCall.length).toBe(2);\n- expect(console.warn.argsForCall[0][0]).toContain('msTransform');\n- expect(console.warn.argsForCall[1][0]).toContain('WebkitTransform');\n+ expect(console.error.argsForCall.length).toBe(2);\n+ expect(console.error.argsForCall[0][0]).toContain('msTransform');\n+ expect(console.error.argsForCall[1][0]).toContain('WebkitTransform');\n });\n \n it('warns when miscapitalizing vendored style names', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n CSSPropertyOperations.createMarkupForStyles({\n msTransform: 'translate3d(0, 0, 0)',\n@@ -146,15 +146,15 @@ describe('CSSPropertyOperations', function() {\n });\n \n \/\/ msTransform is correct already and shouldn't warn\n- expect(console.warn.argsForCall.length).toBe(2);\n- expect(console.warn.argsForCall[0][0]).toContain('oTransform');\n- expect(console.warn.argsForCall[0][0]).toContain('OTransform');\n- expect(console.warn.argsForCall[1][0]).toContain('webkitTransform');\n- expect(console.warn.argsForCall[1][0]).toContain('WebkitTransform');\n+ expect(console.error.argsForCall.length).toBe(2);\n+ expect(console.error.argsForCall[0][0]).toContain('oTransform');\n+ expect(console.error.argsForCall[0][0]).toContain('OTransform');\n+ expect(console.error.argsForCall[1][0]).toContain('webkitTransform');\n+ expect(console.error.argsForCall[1][0]).toContain('WebkitTransform');\n });\n \n it('should warn about style having a trailing semicolon', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n CSSPropertyOperations.createMarkupForStyles({\n fontFamily: 'Helvetica, arial',\n@@ -163,8 +163,8 @@ describe('CSSPropertyOperations', function() {\n color: 'red; '\n });\n \n- expect(console.warn.calls.length).toBe(2);\n- expect(console.warn.argsForCall[0][0]).toContain('Try \"backgroundColor: blue\" instead');\n- expect(console.warn.argsForCall[1][0]).toContain('Try \"color: red\" instead');\n+ expect(console.error.calls.length).toBe(2);\n+ expect(console.error.argsForCall[0][0]).toContain('Try \"backgroundColor: blue\" instead');\n+ expect(console.error.argsForCall[1][0]).toContain('Try \"color: red\" instead');\n });\n });\ndiff --git a\/src\/browser\/ui\/dom\/__tests__\/DOMPropertyOperations-test.js b\/src\/browser\/ui\/dom\/__tests__\/DOMPropertyOperations-test.js\nindex 7a6a681ff2..564437256b 100644\n--- a\/src\/browser\/ui\/dom\/__tests__\/DOMPropertyOperations-test.js\n+++ b\/src\/browser\/ui\/dom\/__tests__\/DOMPropertyOperations-test.js\n@@ -55,23 +55,23 @@ describe('DOMPropertyOperations', function() {\n });\n \n it('should warn about incorrect casing', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n expect(DOMPropertyOperations.createMarkupForProperty(\n 'tabindex',\n '1'\n )).toBe(null);\n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('tabIndex');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('tabIndex');\n });\n \n it('should warn about class', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n expect(DOMPropertyOperations.createMarkupForProperty(\n 'class',\n 'muffins'\n )).toBe(null);\n- expect(console.warn.argsForCall.length).toBe(1);\n- expect(console.warn.argsForCall[0][0]).toContain('className');\n+ expect(console.error.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall[0][0]).toContain('className');\n });\n \n it('should create markup for boolean properties', function() {\ndiff --git a\/src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMInput-test.js b\/src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMInput-test.js\nindex d1bf6b0b2b..f67d43d1b8 100644\n--- a\/src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMInput-test.js\n+++ b\/src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMInput-test.js\n@@ -26,7 +26,7 @@ describe('ReactDOMInput', function() {\n React = require('React');\n ReactLink = require('ReactLink');\n ReactTestUtils = require('ReactTestUtils');\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n });\n \n it('should display `defaultValue` of number 0', function() {\n@@ -216,34 +216,29 @@ describe('ReactDOMInput', function() {\n it('should warn with value and no onChange handler', function() {\n var link = new ReactLink('yolo', mocks.getMockFunction());\n ReactTestUtils.renderIntoDocument();\n- expect(console.warn.argsForCall.length).toBe(0);\n+ expect(console.error.argsForCall.length).toBe(0);\n \n ReactTestUtils.renderIntoDocument(\n \n );\n- expect(console.warn.argsForCall.length).toBe(0);\n+ expect(console.error.argsForCall.length).toBe(0);\n ReactTestUtils.renderIntoDocument();\n- expect(console.warn.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall.length).toBe(1);\n });\n \n it('should warn with value and no onChange handler and readOnly specified', function() {\n ReactTestUtils.renderIntoDocument(\n \n );\n- expect(console.warn.argsForCall.length).toBe(0);\n+ expect(console.error.argsForCall.length).toBe(0);\n \n ReactTestUtils.renderIntoDocument(\n \n );\n- expect(console.warn.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall.length).toBe(1);\n });\n \n it('should throw if both value and valueLink are provided', function() {\n- \/\/ Silences console.error messages\n- \/\/ ReactErrorUtils.guard is applied to all methods of a React component\n- \/\/ and calls console.error in __DEV__ (true for test environment)\n- spyOn(console, 'error');\n-\n var node = document.createElement('div');\n var link = new ReactLink('yolo', mocks.getMockFunction());\n var instance = ;\n@@ -285,7 +280,7 @@ describe('ReactDOMInput', function() {\n var node = document.createElement('div');\n var link = new ReactLink(true, mocks.getMockFunction());\n React.render(, node);\n- expect(console.warn.argsForCall.length).toBe(0);\n+ expect(console.error.argsForCall.length).toBe(0);\n \n ReactTestUtils.renderIntoDocument(\n \n );\n- expect(console.warn.argsForCall.length).toBe(0);\n+ expect(console.error.argsForCall.length).toBe(0);\n \n ReactTestUtils.renderIntoDocument(\n \n );\n- expect(console.warn.argsForCall.length).toBe(0);\n+ expect(console.error.argsForCall.length).toBe(0);\n \n ReactTestUtils.renderIntoDocument();\n- expect(console.warn.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall.length).toBe(1);\n });\n \n it('should warn with checked and no onChange handler with readOnly specified', function() {\n ReactTestUtils.renderIntoDocument(\n \n );\n- expect(console.warn.argsForCall.length).toBe(0);\n+ expect(console.error.argsForCall.length).toBe(0);\n \n ReactTestUtils.renderIntoDocument(\n \n );\n- expect(console.warn.argsForCall.length).toBe(1);\n+ expect(console.error.argsForCall.length).toBe(1);\n });\n \n it('should throw if both checked and checkedLink are provided', function() {\n- \/\/ Silences console.error messages\n- \/\/ ReactErrorUtils.guard is applied to all methods of a React component\n- \/\/ and calls console.error in __DEV__ (true for test environment)\n- spyOn(console, 'error');\n-\n var node = document.createElement('div');\n var link = new ReactLink(true, mocks.getMockFunction());\n var instance = ;\n@@ -345,11 +335,6 @@ describe('ReactDOMInput', function() {\n });\n \n it('should throw if both checkedLink and valueLink are provided', function() {\n- \/\/ Silences console.error messages\n- \/\/ ReactErrorUtils.guard is applied to all methods of a React component\n- \/\/ and calls console.error in __DEV__ (true for test environment)\n- spyOn(console, 'error');\n-\n var node = document.createElement('div');\n var link = new ReactLink(true, mocks.getMockFunction());\n var instance = ;\ndiff --git a\/src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMTextarea-test.js b\/src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMTextarea-test.js\nindex 6ae051f576..902edd5e1b 100644\n--- a\/src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMTextarea-test.js\n+++ b\/src\/browser\/ui\/dom\/components\/__tests__\/ReactDOMTextarea-test.js\n@@ -154,13 +154,13 @@ describe('ReactDOMTextarea', function() {\n });\n \n it('should treat children like `defaultValue`', function() {\n- spyOn(console, 'warn');\n+ spyOn(console, 'error');\n \n var stub =

giraffe<\/textarea>;\n     stub = renderTextarea(stub);\n     var node = React.findDOMNode(stub);\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n     expect(node.value).toBe('giraffe');\n \n     \/\/ Changing children should do nothing, it functions like `defaultValue`.\n@@ -169,33 +169,33 @@ describe('ReactDOMTextarea', function() {\n   });\n \n   it('should allow numbers as children', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var node = React.findDOMNode(renderTextarea(<textarea>{17}<\/textarea>));\n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n     expect(node.value).toBe('17');\n   });\n \n   it('should allow booleans as children', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var node = React.findDOMNode(renderTextarea(<textarea>{false}<\/textarea>));\n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n     expect(node.value).toBe('false');\n   });\n \n   it('should allow objects as children', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var obj = {\n       toString: function() {\n         return \"sharkswithlasers\";\n       }\n     };\n     var node = React.findDOMNode(renderTextarea(<textarea>{obj}<\/textarea>));\n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n     expect(node.value).toBe('sharkswithlasers');\n   });\n \n   it('should throw with multiple or invalid children', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     expect(function() {\n       ReactTestUtils.renderIntoDocument(\n@@ -203,7 +203,7 @@ describe('ReactDOMTextarea', function() {\n       );\n     }).toThrow();\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n \n     var node;\n     expect(function() {\n@@ -212,7 +212,7 @@ describe('ReactDOMTextarea', function() {\n \n     expect(node.value).toBe('[object Object]');\n \n-    expect(console.warn.argsForCall.length).toBe(2);\n+    expect(console.error.argsForCall.length).toBe(2);\n   });\n \n   it('should support ReactLink', function() {\ndiff --git a\/src\/classic\/__tests__\/ReactContextValidator-test.js b\/src\/classic\/__tests__\/ReactContextValidator-test.js\nindex c4770e0888..7f79c1fb10 100644\n--- a\/src\/classic\/__tests__\/ReactContextValidator-test.js\n+++ b\/src\/classic\/__tests__\/ReactContextValidator-test.js\n@@ -32,7 +32,7 @@ describe('ReactContextValidator', function() {\n     reactComponentExpect = require('reactComponentExpect');\n     mocks = require('mocks');\n \n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n   });\n \n   \/\/ TODO: This behavior creates a runtime dependency on propTypes. We should\n@@ -145,8 +145,8 @@ describe('ReactContextValidator', function() {\n \n     ReactTestUtils.renderIntoDocument(<Component \/>);\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: Failed Context Types: ' +\n       'Required context `foo` was not specified in `Component`.'\n     );\n@@ -172,7 +172,7 @@ describe('ReactContextValidator', function() {\n     );\n \n     \/\/ Previous call should not error\n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n \n     var ComponentInFooNumberContext = React.createClass({\n       childContextTypes: {\n@@ -192,8 +192,8 @@ describe('ReactContextValidator', function() {\n \n     ReactTestUtils.renderIntoDocument(<ComponentInFooNumberContext fooValue={123} \/>);\n \n-    expect(console.warn.argsForCall.length).toBe(2);\n-    expect(console.warn.argsForCall[1][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(2);\n+    expect(console.error.argsForCall[1][0]).toBe(\n       'Warning: Failed Context Types: ' +\n       'Invalid context `foo` of type `number` supplied ' +\n       'to `Component`, expected `string`.' +\n@@ -218,20 +218,20 @@ describe('ReactContextValidator', function() {\n     });\n \n     ReactTestUtils.renderIntoDocument(<Component testContext={{bar: 123}} \/>);\n-    expect(console.warn.argsForCall.length).toBe(2);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(2);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: Failed Context Types: ' +\n       'Required child context `foo` was not specified in `Component`.'\n     );\n-    expect(console.warn.argsForCall[1][0]).toBe(\n+    expect(console.error.argsForCall[1][0]).toBe(\n       'Warning: Failed Context Types: ' +\n       'Required child context `foo` was not specified in `Component`.'\n     );\n \n     ReactTestUtils.renderIntoDocument(<Component testContext={{foo: 123}} \/>);\n \n-    expect(console.warn.argsForCall.length).toBe(4);\n-    expect(console.warn.argsForCall[3][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(4);\n+    expect(console.error.argsForCall[3][0]).toBe(\n       'Warning: Failed Context Types: ' +\n       'Invalid child context `foo` of type `number` ' +\n       'supplied to `Component`, expected `string`.'\n@@ -246,7 +246,7 @@ describe('ReactContextValidator', function() {\n     );\n \n     \/\/ Previous calls should not log errors\n-    expect(console.warn.argsForCall.length).toBe(4);\n+    expect(console.error.argsForCall.length).toBe(4);\n   });\n \n });\ndiff --git a\/src\/classic\/class\/__tests__\/ReactBind-test.js b\/src\/classic\/class\/__tests__\/ReactBind-test.js\nindex 6cbd3ef571..856131a978 100644\n--- a\/src\/classic\/class\/__tests__\/ReactBind-test.js\n+++ b\/src\/classic\/class\/__tests__\/ReactBind-test.js\n@@ -125,7 +125,7 @@ describe('autobinding', function() {\n   });\n \n   it('warns if you try to bind to this', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var TestBindComponent = React.createClass({\n       handleClick: function() { },\n@@ -136,8 +136,8 @@ describe('autobinding', function() {\n \n     ReactTestUtils.renderIntoDocument(<TestBindComponent \/>)\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: bind(): You are binding a component method to the component. ' +\n       'React does this for you automatically in a high-performance ' +\n       'way, so you can safely remove this call. See TestBindComponent'\n@@ -145,7 +145,7 @@ describe('autobinding', function() {\n   });\n \n   it('does not warn if you pass an auto-bound method to setState', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var TestBindComponent = React.createClass({\n       getInitialState: function() {\n@@ -164,7 +164,7 @@ describe('autobinding', function() {\n \n     ReactTestUtils.renderIntoDocument(<TestBindComponent \/>)\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n });\ndiff --git a\/src\/classic\/class\/__tests__\/ReactClass-test.js b\/src\/classic\/class\/__tests__\/ReactClass-test.js\nindex 49a0e6b439..e4ddfd3121 100644\n--- a\/src\/classic\/class\/__tests__\/ReactClass-test.js\n+++ b\/src\/classic\/class\/__tests__\/ReactClass-test.js\n@@ -21,7 +21,7 @@ describe('ReactClass-spec', function() {\n   beforeEach(function() {\n     React = require('React');\n     ReactTestUtils = require('ReactTestUtils');\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n   });\n \n   it('should throw when `render` is not specified', function() {\n@@ -56,21 +56,21 @@ describe('ReactClass-spec', function() {\n       }\n     });\n     expect(TestComponent.type).toBe(TestComponent);\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: TestComponent.type is deprecated. Use TestComponent ' +\n       'directly to access the class.'\n     );\n     \/\/ Warn once per class\n     expect(SecondTestComponent.type).toBe(SecondTestComponent);\n-    expect(console.warn.argsForCall.length).toBe(2);\n-    expect(console.warn.argsForCall[1][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(2);\n+    expect(console.error.argsForCall[1][0]).toBe(\n       'Warning: SecondTestComponent.type is deprecated. Use ' +\n       'SecondTestComponent directly to access the class.'\n     );\n     \/\/ Not again\n     expect(TestComponent.type).toBe(TestComponent);\n-    expect(console.warn.argsForCall.length).toBe(2);\n+    expect(console.error.argsForCall.length).toBe(2);\n   });\n \n   it('should copy prop types onto the Constructor', function() {\n@@ -90,8 +90,8 @@ describe('ReactClass-spec', function() {\n   });\n \n   it('should warn on invalid prop types', function() {\n-    var warn = console.warn;\n-    console.warn = mocks.getMockFunction();\n+    var warn = console.error;\n+    console.error = mocks.getMockFunction();\n     try {\n \n       React.createClass({\n@@ -103,19 +103,19 @@ describe('ReactClass-spec', function() {\n           return <span>{this.props.prop}<\/span>;\n         }\n       });\n-      expect(console.warn.mock.calls.length).toBe(1);\n-      expect(console.warn.mock.calls[0][0]).toBe(\n+      expect(console.error.mock.calls.length).toBe(1);\n+      expect(console.error.mock.calls[0][0]).toBe(\n         'Warning: Component: prop type `prop` is invalid; ' +\n         'it must be a function, usually from React.PropTypes.'\n       );\n     } finally {\n-      console.warn = warn;\n+      console.error = warn;\n     }\n   });\n \n   it('should warn on invalid context types', function() {\n-    var warn = console.warn;\n-    console.warn = mocks.getMockFunction();\n+    var warn = console.error;\n+    console.error = mocks.getMockFunction();\n     try {\n       React.createClass({\n         displayName: 'Component',\n@@ -126,19 +126,19 @@ describe('ReactClass-spec', function() {\n           return <span>{this.props.prop}<\/span>;\n         }\n       });\n-      expect(console.warn.mock.calls.length).toBe(1);\n-      expect(console.warn.mock.calls[0][0]).toBe(\n+      expect(console.error.mock.calls.length).toBe(1);\n+      expect(console.error.mock.calls[0][0]).toBe(\n         'Warning: Component: context type `prop` is invalid; ' +\n         'it must be a function, usually from React.PropTypes.'\n       );\n     } finally {\n-      console.warn = warn;\n+      console.error = warn;\n     }\n   });\n \n   it('should throw on invalid child context types', function() {\n-    var warn = console.warn;\n-    console.warn = mocks.getMockFunction();\n+    var warn = console.error;\n+    console.error = mocks.getMockFunction();\n     try {\n       React.createClass({\n         displayName: 'Component',\n@@ -149,13 +149,13 @@ describe('ReactClass-spec', function() {\n           return <span>{this.props.prop}<\/span>;\n         }\n       });\n-      expect(console.warn.mock.calls.length).toBe(1);\n-      expect(console.warn.mock.calls[0][0]).toBe(\n+      expect(console.error.mock.calls.length).toBe(1);\n+      expect(console.error.mock.calls[0][0]).toBe(\n         'Warning: Component: child context type `prop` is invalid; ' +\n         'it must be a function, usually from React.PropTypes.'\n       );\n     } finally {\n-      console.warn = warn;\n+      console.error = warn;\n     }\n   });\n \n@@ -168,8 +168,8 @@ describe('ReactClass-spec', function() {\n         return <div \/>;\n       }\n     });\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: A component has a method called componentShouldUpdate(). Did you ' +\n       'mean shouldComponentUpdate()? The name is phrased as a question ' +\n       'because the function is expected to return a value.'\n@@ -183,8 +183,8 @@ describe('ReactClass-spec', function() {\n         return <div \/>;\n       }\n     });\n-    expect(console.warn.argsForCall.length).toBe(2);\n-    expect(console.warn.argsForCall[1][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(2);\n+    expect(console.error.argsForCall[1][0]).toBe(\n       'Warning: NamedComponent has a method called componentShouldUpdate(). Did you ' +\n       'mean shouldComponentUpdate()? The name is phrased as a question ' +\n       'because the function is expected to return a value.'\n@@ -234,20 +234,20 @@ describe('ReactClass-spec', function() {\n         return <div \/>;\n       }\n     });\n-    expect(console.warn.argsForCall.length).toBe(4);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(4);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'createClass(...): `mixins` is now a static property and should ' +\n       'be defined inside \"statics\".'\n     );\n-    expect(console.warn.argsForCall[1][0]).toBe(\n+    expect(console.error.argsForCall[1][0]).toBe(\n       'createClass(...): `propTypes` is now a static property and should ' +\n       'be defined inside \"statics\".'\n     );\n-    expect(console.warn.argsForCall[2][0]).toBe(\n+    expect(console.error.argsForCall[2][0]).toBe(\n       'createClass(...): `contextTypes` is now a static property and ' +\n       'should be defined inside \"statics\".'\n     );\n-    expect(console.warn.argsForCall[3][0]).toBe(\n+    expect(console.error.argsForCall[3][0]).toBe(\n       'createClass(...): `childContextTypes` is now a static property and ' +\n       'should be defined inside \"statics\".'\n     );\n@@ -371,8 +371,8 @@ describe('ReactClass-spec', function() {\n     });\n \n     expect(() => Component()).toThrow();\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: Something is calling a React component directly. Use a ' +\n       'factory or JSX instead. See: http:\/\/fb.me\/react-legacyfactory'\n     );\ndiff --git a\/src\/classic\/element\/__tests__\/ReactElement-test.js b\/src\/classic\/element\/__tests__\/ReactElement-test.js\nindex c13f83b340..526a0117ec 100644\n--- a\/src\/classic\/element\/__tests__\/ReactElement-test.js\n+++ b\/src\/classic\/element\/__tests__\/ReactElement-test.js\n@@ -129,43 +129,43 @@ describe('ReactElement', function() {\n   });\n \n   it('merges an additional argument onto the children prop', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var a = 1;\n     var element = React.createFactory(ComponentClass)({\n       children: 'text'\n     }, a);\n     expect(element.props.children).toBe(a);\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not override children if no rest args are provided', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var element = React.createFactory(ComponentClass)({\n       children: 'text'\n     });\n     expect(element.props.children).toBe('text');\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('overrides children if null is provided as an argument', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var element = React.createFactory(ComponentClass)({\n       children: 'text'\n     }, null);\n     expect(element.props.children).toBe(null);\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('merges rest arguments onto the children prop in an array', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var a = 1, b = 2, c = 3;\n     var element = React.createFactory(ComponentClass)(null, a, b, c);\n     expect(element.props.children).toEqual([1, 2, 3]);\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('allows static methods to be called using the type property', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var ComponentClass = React.createClass({\n       statics: {\n@@ -183,7 +183,7 @@ describe('ReactElement', function() {\n \n     var element = React.createElement(ComponentClass);\n     expect(element.type.someStaticMethod()).toBe('someReturnValue');\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('identifies valid elements', function() {\n@@ -270,7 +270,7 @@ describe('ReactElement', function() {\n   });\n \n   it('warns when changing a prop after element creation', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Outer = React.createClass({\n       render: function() {\n         var el = <div className=\"moo\" \/>;\n@@ -285,15 +285,15 @@ describe('ReactElement', function() {\n     var outer = ReactTestUtils.renderIntoDocument(<Outer color=\"orange\" \/>);\n     expect(React.findDOMNode(outer).className).toBe('quack');\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Don\\'t set .props.className of the React component <div \/>.'\n     );\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'The element was created by Outer.'\n     );\n \n-    console.warn.reset();\n+    console.error.reset();\n \n     \/\/ This also warns (just once per key\/type pair)\n     outer.props.color = 'green';\n@@ -301,14 +301,14 @@ describe('ReactElement', function() {\n     outer.props.color = 'purple';\n     outer.forceUpdate();\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Don\\'t set .props.color of the React component <Outer \/>.'\n     );\n   });\n \n   it('warns when adding a prop after element creation', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var el = document.createElement('div');\n     var Outer = React.createClass({\n       getDefaultProps: () => ({sound: 'meow'}),\n@@ -327,15 +327,15 @@ describe('ReactElement', function() {\n     expect(React.findDOMNode(outer).textContent).toBe('meow');\n     expect(React.findDOMNode(outer).className).toBe('quack');\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Don\\'t set .props.className of the React component <div \/>.'\n     );\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'The element was created by Outer.'\n     );\n \n-    console.warn.reset();\n+    console.error.reset();\n \n     var newOuterEl = <Outer \/>;\n     newOuterEl.props.sound = 'oink';\n@@ -343,14 +343,14 @@ describe('ReactElement', function() {\n     expect(React.findDOMNode(outer).textContent).toBe('oink');\n     expect(React.findDOMNode(outer).className).toBe('quack');\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Don\\'t set .props.sound of the React component <Outer \/>.'\n     );\n   });\n \n   it('does not warn for NaN props', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Test = React.createClass({\n       render: function() {\n         return <div \/>;\n@@ -358,7 +358,7 @@ describe('ReactElement', function() {\n     });\n     var test = ReactTestUtils.renderIntoDocument(<Test value={+undefined} \/>);\n     expect(test.props.value).toBeNaN();\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n });\ndiff --git a\/src\/classic\/element\/__tests__\/ReactElementClone-test.js b\/src\/classic\/element\/__tests__\/ReactElementClone-test.js\nindex 6f595d7cc8..e7e0134625 100644\n--- a\/src\/classic\/element\/__tests__\/ReactElementClone-test.js\n+++ b\/src\/classic\/element\/__tests__\/ReactElementClone-test.js\n@@ -199,42 +199,42 @@ describe('ReactElementClone', function() {\n   });\n \n   it('warns for keys for arrays of elements in rest args', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     React.cloneElement(<div \/>, null, [<div \/>, <div \/>]);\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Each child in an array or iterator should have a unique \"key\" prop.'\n     );\n   });\n \n   it('does not warns for arrays of elements with keys', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     React.cloneElement(<div \/>, null, [<div key=\"#1\" \/>, <div key=\"#2\" \/>]);\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not warn when the element is directly in rest args', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     React.cloneElement(<div \/>, null, <div \/>, <div \/>);\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not warn when the array contains a non-element', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     React.cloneElement(<div \/>, null, [{}, {}]);\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('should check declared prop types after clone', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createClass({\n       propTypes: {\n         color: React.PropTypes.string.isRequired\n@@ -257,8 +257,8 @@ describe('ReactElementClone', function() {\n       }\n     });\n     ReactTestUtils.renderIntoDocument(React.createElement(GrandParent));\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Invalid prop `color` of type `number` supplied to `Component`, ' +\n       'expected `string`. Check the render method of `Parent`.'\ndiff --git a\/src\/classic\/element\/__tests__\/ReactElementValidator-test.js b\/src\/classic\/element\/__tests__\/ReactElementValidator-test.js\nindex d6ef3365fc..bd908c4bf4 100644\n--- a\/src\/classic\/element\/__tests__\/ReactElementValidator-test.js\n+++ b\/src\/classic\/element\/__tests__\/ReactElementValidator-test.js\n@@ -37,19 +37,19 @@ describe('ReactElementValidator', function() {\n   }\n \n   it('warns for keys for arrays of elements in rest args', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     Component(null, [Component(), Component()]);\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Each child in an array or iterator should have a unique \"key\" prop.'\n     );\n   });\n \n   it('warns for keys for arrays of elements with owner info', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     var InnerClass = React.createClass({\n@@ -72,8 +72,8 @@ describe('ReactElementValidator', function() {\n       React.createElement(ComponentWrapper)\n     );\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Each child in an array or iterator should have a unique \"key\" prop. ' +\n       'Check the render method of InnerClass. ' +\n       'It was passed a child from ComponentWrapper. '\n@@ -81,7 +81,7 @@ describe('ReactElementValidator', function() {\n   });\n \n   it('warns for keys for arrays with no owner or parent info', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var Anonymous = React.createClass({\n       displayName: undefined,\n@@ -96,15 +96,15 @@ describe('ReactElementValidator', function() {\n     ];\n     ReactTestUtils.renderIntoDocument(<Anonymous>{divs}<\/Anonymous>);\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: Each child in an array or iterator should have a unique ' +\n       '\"key\" prop. See http:\/\/fb.me\/react-warning-keys for more information.'\n     );\n   });\n \n   it('warns for keys for arrays of elements with no owner info', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var divs = [\n       <div \/>,\n@@ -112,8 +112,8 @@ describe('ReactElementValidator', function() {\n     ];\n     ReactTestUtils.renderIntoDocument(<div>{divs}<\/div>);\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: Each child in an array or iterator should have a unique ' +\n       '\"key\" prop. Check the React.render call using <div>. See ' +\n       'http:\/\/fb.me\/react-warning-keys for more information.'\n@@ -121,7 +121,7 @@ describe('ReactElementValidator', function() {\n   });\n \n   it('warns for keys for iterables of elements in rest args', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     var iterable = {\n@@ -138,23 +138,23 @@ describe('ReactElementValidator', function() {\n \n     Component(null, iterable);\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Each child in an array or iterator should have a unique \"key\" prop.'\n     );\n   });\n \n   it('does not warns for arrays of elements with keys', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     Component(null, [Component({key: '#1'}), Component({key: '#2'})]);\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not warns for iterable elements with keys', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     var iterable = {\n@@ -174,23 +174,23 @@ describe('ReactElementValidator', function() {\n \n     Component(null, iterable);\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('warns for numeric keys on objects in rest args', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     Component(null, frag({1: Component(), 2: Component()}));\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Child objects should have non-numeric keys so ordering is preserved.'\n     );\n   });\n \n   it('does not warn for numeric keys in entry iterables in rest args', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     var iterable = {\n@@ -208,25 +208,25 @@ describe('ReactElementValidator', function() {\n \n     Component(null, iterable);\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not warn when the element is directly in rest args', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     Component(null, Component(), Component());\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not warn when the array contains a non-element', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createFactory(ComponentClass);\n \n     Component(null, [ {}, {} ]);\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   \/\/ TODO: These warnings currently come from the composite component, but\n@@ -236,7 +236,7 @@ describe('ReactElementValidator', function() {\n     \/\/ In this test, we're making sure that if a proptype error is found in a\n     \/\/ component, we give a small hint as to which parent instantiated that\n     \/\/ component as per warnings about key usage in ReactElementValidator.\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var MyComp = React.createClass({\n       propTypes: {\n         color: React.PropTypes.string\n@@ -251,7 +251,7 @@ describe('ReactElementValidator', function() {\n       }\n     });\n     ReactTestUtils.renderIntoDocument(React.createElement(ParentComp));\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Invalid prop `color` of type `number` supplied to `MyComp`, ' +\n       'expected `string`. Check the render method of `ParentComp`.'\n@@ -259,26 +259,26 @@ describe('ReactElementValidator', function() {\n   });\n \n   it('gives a helpful error when passing null or undefined', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     React.createElement(undefined);\n     React.createElement(null);\n-    expect(console.warn.calls.length).toBe(2);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(2);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: React.createElement: type should not be null or undefined. ' +\n       'It should be a string (for DOM elements) or a ReactClass (for ' +\n       'composite components).'\n     );\n-    expect(console.warn.calls[1].args[0]).toBe(\n+    expect(console.error.calls[1].args[0]).toBe(\n       'Warning: React.createElement: type should not be null or undefined. ' +\n       'It should be a string (for DOM elements) or a ReactClass (for ' +\n       'composite components).'\n     );\n     React.createElement('div');\n-    expect(console.warn.calls.length).toBe(2);\n+    expect(console.error.calls.length).toBe(2);\n   });\n \n   it('includes the owner name when passing null or undefined', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var ParentComp = React.createClass({\n       render: function() {\n         return React.createElement(null);\n@@ -287,19 +287,19 @@ describe('ReactElementValidator', function() {\n     expect(function() {\n       ReactTestUtils.renderIntoDocument(React.createElement(ParentComp));\n     }).toThrow();\n-    expect(console.warn.calls.length).toBe(2);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(2);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: React.createElement: type should not be null or undefined. ' +\n       'It should be a string (for DOM elements) or a ReactClass (for ' +\n       'composite components). Check the render method of `ParentComp`.'\n     );\n-    expect(console.warn.calls[1].args[0]).toBe(\n+    expect(console.error.calls[1].args[0]).toBe(\n       'Warning: Only functions or strings can be mounted as React components.'\n     );\n   });\n \n   it('should check default prop values', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var Component = React.createClass({\n       propTypes: {prop: React.PropTypes.string.isRequired},\n@@ -313,15 +313,15 @@ describe('ReactElementValidator', function() {\n \n     ReactTestUtils.renderIntoDocument(React.createElement(Component));\n \n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Required prop `prop` was not specified in `Component`.'\n     );\n   });\n \n   it('should not check the default for explicit null', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var Component = React.createClass({\n       propTypes: {prop: React.PropTypes.string.isRequired},\n@@ -337,15 +337,15 @@ describe('ReactElementValidator', function() {\n       React.createElement(Component, {prop:null})\n     );\n \n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Required prop `prop` was not specified in `Component`.'\n     );\n   });\n \n   it('should check declared prop types', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var Component = React.createClass({\n       propTypes: {\n@@ -363,13 +363,13 @@ describe('ReactElementValidator', function() {\n       React.createElement(Component, {prop: 42})\n     );\n \n-    expect(console.warn.calls.length).toBe(2);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(2);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Required prop `prop` was not specified in `Component`.'\n     );\n \n-    expect(console.warn.calls[1].args[0]).toBe(\n+    expect(console.error.calls[1].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Invalid prop `prop` of type `number` supplied to ' +\n       '`Component`, expected `string`.'\n@@ -380,11 +380,11 @@ describe('ReactElementValidator', function() {\n     );\n \n     \/\/ Should not error for strings\n-    expect(console.warn.calls.length).toBe(2);\n+    expect(console.error.calls.length).toBe(2);\n   });\n \n   it('should warn if a PropType creator is used as a PropType', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var Component = React.createClass({\n       propTypes: {\n@@ -399,8 +399,8 @@ describe('ReactElementValidator', function() {\n       React.createElement(Component, {myProp: {value: 'hi'}})\n     );\n \n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Component: type specification of prop `myProp` is invalid; ' +\n       'the type checker function must return `null` or an `Error` but ' +\n       'returned a function. You may have forgotten to pass an argument to ' +\n@@ -410,15 +410,15 @@ describe('ReactElementValidator', function() {\n   });\n \n   it('should warn if a fragment is used without the wrapper', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var child = React.createElement('span');\n     React.createElement('div', null, {a: child, b: child});\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toContain('use of a keyed object');\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toContain('use of a keyed object');\n   });\n \n   it('should warn when accessing .type on an element factory', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var TestComponent = React.createClass({\n       render: function() {\n         return <div \/>;\n@@ -426,14 +426,14 @@ describe('ReactElementValidator', function() {\n     });\n     var TestFactory = React.createFactory(TestComponent);\n     expect(TestFactory.type).toBe(TestComponent);\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: Factory.type is deprecated. Access the class directly before ' +\n       'passing it to createFactory.'\n     );\n     \/\/ Warn once, not again\n     expect(TestFactory.type).toBe(TestComponent);\n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n   });\n \n });\ndiff --git a\/src\/classic\/types\/__tests__\/ReactPropTypes-test.js b\/src\/classic\/types\/__tests__\/ReactPropTypes-test.js\nindex d1683e9d52..bf3b28a062 100644\n--- a\/src\/classic\/types\/__tests__\/ReactPropTypes-test.js\n+++ b\/src\/classic\/types\/__tests__\/ReactPropTypes-test.js\n@@ -233,7 +233,7 @@ describe('ReactPropTypes', function() {\n           return <div>{this.props.label}<\/div>;\n         }\n       });\n-      spyOn(console, 'warn');\n+      spyOn(console, 'error');\n     });\n \n     it('should support components', () => {\n@@ -253,14 +253,14 @@ describe('ReactPropTypes', function() {\n       var instance = <Component label={<div \/>} \/>;\n       instance = ReactTestUtils.renderIntoDocument(instance);\n \n-      expect(console.warn.argsForCall.length).toBe(0);\n+      expect(console.error.argsForCall.length).toBe(0);\n     });\n \n     it('should warn when passing no label and isRequired is set', () => {\n       var instance = <Component \/>;\n       instance = ReactTestUtils.renderIntoDocument(instance);\n \n-      expect(console.warn.argsForCall.length).toBe(1);\n+      expect(console.error.argsForCall.length).toBe(1);\n     });\n \n     it(\"should be implicitly optional and not warn without values\", function() {\n@@ -358,7 +358,7 @@ describe('ReactPropTypes', function() {\n     });\n \n     it('should not warn for valid values', function() {\n-      spyOn(console, 'warn');\n+      spyOn(console, 'error');\n       typeCheckPass(PropTypes.node, <div \/>);\n       typeCheckPass(PropTypes.node, false);\n       typeCheckPass(PropTypes.node, <MyComponent \/>);\n@@ -388,7 +388,7 @@ describe('ReactPropTypes', function() {\n         k4: null,\n         k5: undefined\n       }));\n-      expect(console.warn.calls).toEqual([]);\n+      expect(console.error.calls).toEqual([]);\n \n       \/\/ This should also pass, though it warns\n       typeCheckPass(PropTypes.node, {\n@@ -717,7 +717,7 @@ describe('ReactPropTypes', function() {\n   describe('Custom validator', function() {\n     beforeEach(function() {\n       require('mock-modules').dumpCache();\n-      spyOn(console, 'warn');\n+      spyOn(console, 'error');\n     });\n \n     it('should have been called with the right params', function() {\n@@ -772,8 +772,8 @@ describe('ReactPropTypes', function() {\n \n       var instance = <Component num={6} \/>;\n       instance = ReactTestUtils.renderIntoDocument(instance);\n-      expect(console.warn.argsForCall.length).toBe(1);\n-      expect(console.warn.argsForCall[0][0]).toBe(\n+      expect(console.error.argsForCall.length).toBe(1);\n+      expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: Failed propType: num must be 5!');\n     });\n \n@@ -794,7 +794,7 @@ describe('ReactPropTypes', function() {\n \n         var instance = <Component num={5} \/>;\n         instance = ReactTestUtils.renderIntoDocument(instance);\n-        expect(console.warn.argsForCall.length).toBe(0);\n+        expect(console.error.argsForCall.length).toBe(0);\n       }\n     );\n   });\ndiff --git a\/src\/core\/__tests__\/ReactComponentLifeCycle-test.js b\/src\/core\/__tests__\/ReactComponentLifeCycle-test.js\nindex ec749dbba3..736f2a02d7 100644\n--- a\/src\/core\/__tests__\/ReactComponentLifeCycle-test.js\n+++ b\/src\/core\/__tests__\/ReactComponentLifeCycle-test.js\n@@ -239,7 +239,7 @@ describe('ReactComponentLifeCycle', function() {\n   });\n \n   it('should not allow update state inside of getInitialState', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var StatefulComponent = React.createClass({\n       getInitialState: function() {\n         this.setState({stateField: 'something'});\n@@ -253,8 +253,8 @@ describe('ReactComponentLifeCycle', function() {\n       }\n     });\n     ReactTestUtils.renderIntoDocument(<StatefulComponent \/>);\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: setState(...): Can only update a mounted or ' +\n       'mounting component. This usually means you called setState() on an ' +\n       'unmounted component. This is a no-op.'\n@@ -262,7 +262,7 @@ describe('ReactComponentLifeCycle', function() {\n   });\n \n   it('should correctly determine if a component is mounted', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createClass({\n       componentWillMount: function() {\n         expect(this.isMounted()).toBeFalsy();\n@@ -281,14 +281,14 @@ describe('ReactComponentLifeCycle', function() {\n     var instance = ReactTestUtils.renderIntoDocument(element);\n     expect(instance.isMounted()).toBeTruthy();\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Component is accessing isMounted inside its render()'\n     );\n   });\n \n   it('warns if findDOMNode is used inside render', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var Component = React.createClass({\n       getInitialState: function() {\n         return {isMounted: false};\n@@ -305,8 +305,8 @@ describe('ReactComponentLifeCycle', function() {\n     });\n \n     ReactTestUtils.renderIntoDocument(<Component \/>);\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Component is accessing getDOMNode or findDOMNode inside its render()'\n     );\n   });\ndiff --git a\/src\/core\/__tests__\/ReactCompositeComponent-test.js b\/src\/core\/__tests__\/ReactCompositeComponent-test.js\nindex 76c8b2c2a8..e48ebf5c4e 100644\n--- a\/src\/core\/__tests__\/ReactCompositeComponent-test.js\n+++ b\/src\/core\/__tests__\/ReactCompositeComponent-test.js\n@@ -74,10 +74,10 @@ describe('ReactCompositeComponent', function() {\n     \/\/ Ignore the first warning which is fired by using withContext at all.\n     \/\/ That way we don't have to reset and assert it on every subsequent test.\n     \/\/ This will be killed soon anyway.\n-    console.warn = mocks.getMockFunction();\n+    console.error = mocks.getMockFunction();\n     React.withContext({}, function() { });\n \n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n   });\n \n   it('should support rendering to different child types over time', function() {\n@@ -116,7 +116,7 @@ describe('ReactCompositeComponent', function() {\n     container.innerHTML = markup;\n \n     React.render(<Parent \/>, container);\n-    expect(console.warn).not.toHaveBeenCalled();\n+    expect(console.error).not.toHaveBeenCalled();\n   });\n \n   it('should react to state changes from callbacks', function() {\n@@ -191,11 +191,11 @@ describe('ReactCompositeComponent', function() {\n       mountedInstance.methodExplicitlyNotBound();\n     }).not.toThrow();\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n     var explicitlyBound = mountedInstance.methodToBeExplicitlyBound.bind(\n       mountedInstance\n     );\n-    expect(console.warn.argsForCall.length).toBe(2);\n+    expect(console.error.argsForCall.length).toBe(2);\n     var autoBound = mountedInstance.methodAutoBound;\n     var explicitlyNotBound = mountedInstance.methodExplicitlyNotBound;\n \n@@ -283,13 +283,13 @@ describe('ReactCompositeComponent', function() {\n     instance = React.render(instance, container);\n     instance.forceUpdate();\n \n-    expect(console.warn.calls.length).toBe(0);\n+    expect(console.error.calls.length).toBe(0);\n \n     React.unmountComponentAtNode(container);\n \n     instance.forceUpdate();\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: forceUpdate(...): Can only update a mounted or ' +\n       'mounting component. This usually means you called forceUpdate() on ' +\n       'an unmounted component. This is a no-op.'\n@@ -315,12 +315,12 @@ describe('ReactCompositeComponent', function() {\n     instance = React.render(instance, container);\n     instance.setState({value: 1});\n \n-    expect(console.warn.calls.length).toBe(0);\n+    expect(console.error.calls.length).toBe(0);\n \n     React.unmountComponentAtNode(container);\n     instance.setState({value: 2});\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: setState(...): Can only update a mounted or ' +\n       'mounting component. This usually means you called setState() on an ' +\n       'unmounted component. This is a no-op.'\n@@ -352,10 +352,10 @@ describe('ReactCompositeComponent', function() {\n     var instance = React.render(<Component \/>, container);\n \n     instance.setState({value: 1});\n-    expect(console.warn.calls.length).toBe(0);\n+    expect(console.error.calls.length).toBe(0);\n \n     React.unmountComponentAtNode(container);\n-    expect(console.warn.calls.length).toBe(0);\n+    expect(console.error.calls.length).toBe(0);\n     expect(cbCalled).toBe(false);\n   });\n \n@@ -376,15 +376,15 @@ describe('ReactCompositeComponent', function() {\n     expect(function() {\n       instance.setProps({value: 1});\n     }).not.toThrow();\n-    expect(console.warn.calls.length).toBe(0);\n+    expect(console.error.calls.length).toBe(0);\n \n     React.unmountComponentAtNode(container);\n     expect(function() {\n       instance.setProps({value: 2});\n     }).not.toThrow();\n \n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: setProps(...): Can only update a mounted or ' +\n       'mounting component. This usually means you called setProps() on an ' +\n       'unmounted component. This is a no-op.'\n@@ -493,8 +493,8 @@ describe('ReactCompositeComponent', function() {\n     var instance = ReactTestUtils.renderIntoDocument(<Component \/>);\n     instance.setState({bogus: true});\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: Component.shouldComponentUpdate(): Returned undefined instead of a ' +\n       'boolean value. Make sure to return true or false.'\n     );\n@@ -576,8 +576,8 @@ describe('ReactCompositeComponent', function() {\n       ReactTestUtils.renderIntoDocument(<Component \/>);\n     });\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: owner-based and parent-based contexts differ ' +\n       '(values: `bar` vs `undefined`) for key (foo) ' +\n       'while mounting Component (see: http:\/\/fb.me\/react-context-by-parent)'\n@@ -619,8 +619,8 @@ describe('ReactCompositeComponent', function() {\n \n     \/\/ Two warnings, one for the component and one for the div\n     \/\/ We may want to make this expect one warning in the future\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: owner-based and parent-based contexts differ ' +\n       '(values: `noise` vs `bar`) for key (foo) while mounting Component ' +\n       '(see: http:\/\/fb.me\/react-context-by-parent)'\n@@ -662,7 +662,7 @@ describe('ReactCompositeComponent', function() {\n     });\n     React.render(<Parent>{componentWithSameContext}<\/Parent>, div);\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n \n     var componentWithDifferentContext = React.withContext({foo: 'noise'}, function() {\n       return <Component \/>;\n@@ -671,8 +671,8 @@ describe('ReactCompositeComponent', function() {\n \n     \/\/ Two warnings, one for the component and one for the div\n     \/\/ We may want to make this expect one warning in the future\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: owner-based and parent-based contexts differ ' +\n       '(values: `noise` vs `bar`) for key (foo) while mounting Component ' +\n       '(see: http:\/\/fb.me\/react-context-by-parent)'\n@@ -725,8 +725,8 @@ describe('ReactCompositeComponent', function() {\n \n     \/\/ Two warnings, one for the component and one for the div\n     \/\/ We may want to make this expect one warning in the future\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: owner-based and parent-based contexts differ ' +\n       '(values: `noise` vs `bar`) for key (foo) while mounting Component ' +\n       '(see: http:\/\/fb.me\/react-context-by-parent)'\n@@ -820,8 +820,8 @@ describe('ReactCompositeComponent', function() {\n     });\n \n     ReactTestUtils.renderIntoDocument(<Outer \/>);\n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toBe(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toBe(\n       'Warning: _renderNewRootComponent(): Render methods should ' +\n       'be a pure function of props and state; triggering nested component ' +\n       'updates from render is not allowed. If necessary, trigger nested ' +\n@@ -930,8 +930,8 @@ describe('ReactCompositeComponent', function() {\n     expect(function() {\n       ReactTestUtils.renderIntoDocument(<div><NotAComponent \/><\/div>);\n     }).toThrow();  \/\/ has no method 'render'\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toContain(\n       'NotAComponent(...): No `render` method found'\n     );\n   });\ndiff --git a\/src\/core\/__tests__\/ReactMockedComponent-test.js b\/src\/core\/__tests__\/ReactMockedComponent-test.js\nindex 2be35a14a3..6340c063b0 100644\n--- a\/src\/core\/__tests__\/ReactMockedComponent-test.js\n+++ b\/src\/core\/__tests__\/ReactMockedComponent-test.js\n@@ -56,9 +56,9 @@ describe('ReactMockedComponent', function() {\n   });\n \n   it('should allow an implicitly mocked component to be rendered without warnings', () => {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     ReactTestUtils.renderIntoDocument(<AutoMockedComponent \/>);\n-    expect(console.warn.calls.length).toBe(0);\n+    expect(console.error.calls.length).toBe(0);\n   });\n \n   it('should allow an implicitly mocked component to be updated', () => {\ndiff --git a\/src\/modern\/class\/__tests__\/ReactCoffeeScriptClass-test.coffee b\/src\/modern\/class\/__tests__\/ReactCoffeeScriptClass-test.coffee\nindex 268e4368fe..fb41a04734 100644\n--- a\/src\/modern\/class\/__tests__\/ReactCoffeeScriptClass-test.coffee\n+++ b\/src\/modern\/class\/__tests__\/ReactCoffeeScriptClass-test.coffee\n@@ -264,7 +264,7 @@ describe 'ReactCoffeeScriptClass', ->\n \n   it 'warns when classic properties are defined on the instance,\n       but does not invoke them.', ->\n-    spyOn console, 'warn'\n+    spyOn console, 'error'\n     getInitialStateWasCalled = false\n     class Foo extends React.Component\n       constructor: ->\n@@ -281,19 +281,19 @@ describe 'ReactCoffeeScriptClass', ->\n \n     test React.createElement(Foo), 'SPAN', 'foo'\n     expect(getInitialStateWasCalled).toBe false\n-    expect(console.warn.calls.length).toBe 3\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe 3\n+    expect(console.error.calls[0].args[0]).toContain(\n       'getInitialState was defined on Foo, a plain JavaScript class.'\n     )\n-    expect(console.warn.calls[1].args[0]).toContain(\n+    expect(console.error.calls[1].args[0]).toContain(\n       'propTypes was defined as an instance property on Foo.'\n     )\n-    expect(console.warn.calls[2].args[0]).toContain(\n+    expect(console.error.calls[2].args[0]).toContain(\n       'contextTypes was defined as an instance property on Foo.'\n     )\n \n   it 'should warn when mispelling shouldComponentUpdate', ->\n-    spyOn console, 'warn'\n+    spyOn console, 'error'\n     class NamedComponent\n       componentShouldUpdate: ->\n         false\n@@ -303,15 +303,15 @@ describe 'ReactCoffeeScriptClass', ->\n           className: 'foo'\n \n     test React.createElement(NamedComponent), 'SPAN', 'foo'\n-    expect(console.warn.calls.length).toBe 1\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe 1\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: NamedComponent has a method called componentShouldUpdate().\n        Did you mean shouldComponentUpdate()? The name is phrased as a\n        question because the function is expected to return a value.'\n     )\n \n   it 'should throw AND warn when trying to access classic APIs', ->\n-    spyOn console, 'warn'\n+    spyOn console, 'error'\n     instance =\n       test Inner(name: 'foo'), 'DIV', 'foo'\n     expect(-> instance.getDOMNode()).toThrow()\n@@ -319,20 +319,20 @@ describe 'ReactCoffeeScriptClass', ->\n     expect(-> instance.isMounted()).toThrow()\n     expect(-> instance.setProps name: 'bar').toThrow()\n     expect(-> instance.replaceProps name: 'bar').toThrow()\n-    expect(console.warn.calls.length).toBe 5\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe 5\n+    expect(console.error.calls[0].args[0]).toContain(\n       'getDOMNode(...) is deprecated in plain JavaScript React classes'\n     )\n-    expect(console.warn.calls[1].args[0]).toContain(\n+    expect(console.error.calls[1].args[0]).toContain(\n       'replaceState(...) is deprecated in plain JavaScript React classes'\n     )\n-    expect(console.warn.calls[2].args[0]).toContain(\n+    expect(console.error.calls[2].args[0]).toContain(\n       'isMounted(...) is deprecated in plain JavaScript React classes'\n     )\n-    expect(console.warn.calls[3].args[0]).toContain(\n+    expect(console.error.calls[3].args[0]).toContain(\n       'setProps(...) is deprecated in plain JavaScript React classes'\n     )\n-    expect(console.warn.calls[4].args[0]).toContain(\n+    expect(console.error.calls[4].args[0]).toContain(\n       'replaceProps(...) is deprecated in plain JavaScript React classes'\n     )\n \ndiff --git a\/src\/modern\/class\/__tests__\/ReactES6Class-test.js b\/src\/modern\/class\/__tests__\/ReactES6Class-test.js\nindex d4e7bc6343..eb66f819a7 100644\n--- a\/src\/modern\/class\/__tests__\/ReactES6Class-test.js\n+++ b\/src\/modern\/class\/__tests__\/ReactES6Class-test.js\n@@ -296,7 +296,7 @@ describe('ReactES6Class', function() {\n \n   it('warns when classic properties are defined on the instance, ' +\n      'but does not invoke them.', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var getInitialStateWasCalled = false;\n     class Foo extends React.Component {\n       constructor() {\n@@ -313,20 +313,20 @@ describe('ReactES6Class', function() {\n     }\n     test(<Foo \/>, 'SPAN', 'foo');\n     expect(getInitialStateWasCalled).toBe(false);\n-    expect(console.warn.calls.length).toBe(3);\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe(3);\n+    expect(console.error.calls[0].args[0]).toContain(\n       'getInitialState was defined on Foo, a plain JavaScript class.'\n     );\n-    expect(console.warn.calls[1].args[0]).toContain(\n+    expect(console.error.calls[1].args[0]).toContain(\n       'propTypes was defined as an instance property on Foo.'\n     );\n-    expect(console.warn.calls[2].args[0]).toContain(\n+    expect(console.error.calls[2].args[0]).toContain(\n       'contextTypes was defined as an instance property on Foo.'\n     );\n   });\n \n   it('should warn when mispelling shouldComponentUpdate', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     class NamedComponent {\n       componentShouldUpdate() {\n@@ -338,8 +338,8 @@ describe('ReactES6Class', function() {\n     }\n     test(<NamedComponent \/>, 'SPAN', 'foo');\n \n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: ' +\n       'NamedComponent has a method called componentShouldUpdate(). Did you ' +\n       'mean shouldComponentUpdate()? The name is phrased as a question ' +\n@@ -348,27 +348,27 @@ describe('ReactES6Class', function() {\n   });\n \n   it('should throw AND warn when trying to access classic APIs', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var instance = test(<Inner name=\"foo\" \/>, 'DIV', 'foo');\n     expect(() => instance.getDOMNode()).toThrow();\n     expect(() => instance.replaceState({})).toThrow();\n     expect(() => instance.isMounted()).toThrow();\n     expect(() => instance.setProps({name: 'bar'})).toThrow();\n     expect(() => instance.replaceProps({name: 'bar'})).toThrow();\n-    expect(console.warn.calls.length).toBe(5);\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe(5);\n+    expect(console.error.calls[0].args[0]).toContain(\n       'getDOMNode(...) is deprecated in plain JavaScript React classes'\n     );\n-    expect(console.warn.calls[1].args[0]).toContain(\n+    expect(console.error.calls[1].args[0]).toContain(\n       'replaceState(...) is deprecated in plain JavaScript React classes'\n     );\n-    expect(console.warn.calls[2].args[0]).toContain(\n+    expect(console.error.calls[2].args[0]).toContain(\n       'isMounted(...) is deprecated in plain JavaScript React classes'\n     );\n-    expect(console.warn.calls[3].args[0]).toContain(\n+    expect(console.error.calls[3].args[0]).toContain(\n       'setProps(...) is deprecated in plain JavaScript React classes'\n     );\n-    expect(console.warn.calls[4].args[0]).toContain(\n+    expect(console.error.calls[4].args[0]).toContain(\n       'replaceProps(...) is deprecated in plain JavaScript React classes'\n     );\n   });\ndiff --git a\/src\/modern\/class\/__tests__\/ReactTypeScriptClass-test.ts b\/src\/modern\/class\/__tests__\/ReactTypeScriptClass-test.ts\nindex b0e4562945..70423d8c07 100644\n--- a\/src\/modern\/class\/__tests__\/ReactTypeScriptClass-test.ts\n+++ b\/src\/modern\/class\/__tests__\/ReactTypeScriptClass-test.ts\n@@ -408,7 +408,7 @@ describe('ReactTypeScriptClass', function() {\n   it('warns when classic properties are defined on the instance, ' +\n      'but does not invoke them.', function() {\n     var warn = jest.genMockFn();\n-    console.warn = warn;\n+    console.error = warn;\n     getInitialStateWasCalled = false;\n     test(React.createElement(ClassicProperties), 'SPAN', 'foo');\n     expect(getInitialStateWasCalled).toBe(false);\n@@ -427,7 +427,7 @@ describe('ReactTypeScriptClass', function() {\n \n   it('should warn when mispelling shouldComponentUpdate', function() {\n     var warn = jest.genMockFn();\n-    console.warn = warn;\n+    console.error = warn;\n \n     test(React.createElement(NamedComponent), 'SPAN', 'foo');\n \n@@ -442,7 +442,7 @@ describe('ReactTypeScriptClass', function() {\n \n   it('should throw AND warn when trying to access classic APIs', function() {\n     var warn = jest.genMockFn();\n-    console.warn = warn;\n+    console.error = warn;\n     var instance = test(\n       React.createElement(Inner, {name: 'foo'}),\n       'DIV','foo'\ndiff --git a\/src\/modern\/element\/__tests__\/ReactJSXElement-test.js b\/src\/modern\/element\/__tests__\/ReactJSXElement-test.js\nindex edffa3243f..ddc319003c 100644\n--- a\/src\/modern\/element\/__tests__\/ReactJSXElement-test.js\n+++ b\/src\/modern\/element\/__tests__\/ReactJSXElement-test.js\n@@ -86,37 +86,37 @@ describe('ReactJSXElement', function() {\n   });\n \n   it('merges JSX children onto the children prop', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var a = 1;\n     var element = <Component children=\"text\">{a}<\/Component>;\n     expect(element.props.children).toBe(a);\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not override children if no JSX children are provided', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var element = <Component children=\"text\" \/>;\n     expect(element.props.children).toBe('text');\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('overrides children if null is provided as a JSX child', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var element = <Component children=\"text\">{null}<\/Component>;\n     expect(element.props.children).toBe(null);\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('merges JSX children onto the children prop in an array', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var a = 1, b = 2, c = 3;\n     var element = <Component>{a}{b}{c}<\/Component>;\n     expect(element.props.children).toEqual([1, 2, 3]);\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('allows static methods to be called using the type property', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     class Component {\n       static someStaticMethod() {\n@@ -129,7 +129,7 @@ describe('ReactJSXElement', function() {\n \n     var element = <Component \/>;\n     expect(element.type.someStaticMethod()).toBe('someReturnValue');\n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('identifies valid elements', function() {\ndiff --git a\/src\/modern\/element\/__tests__\/ReactJSXElementValidator-test.js b\/src\/modern\/element\/__tests__\/ReactJSXElementValidator-test.js\nindex f5d64bccf8..b3cf895158 100644\n--- a\/src\/modern\/element\/__tests__\/ReactJSXElementValidator-test.js\n+++ b\/src\/modern\/element\/__tests__\/ReactJSXElementValidator-test.js\n@@ -38,18 +38,18 @@ describe('ReactJSXElementValidator', function() {\n   }\n \n   it('warns for keys for arrays of elements in children position', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     <Component>{[<Component \/>, <Component \/>]}<\/Component>;\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Each child in an array or iterator should have a unique \"key\" prop.'\n     );\n   });\n \n   it('warns for keys for arrays of elements with owner info', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     class InnerComponent {\n       render() {\n@@ -69,8 +69,8 @@ describe('ReactJSXElementValidator', function() {\n \n     ReactTestUtils.renderIntoDocument(<ComponentWrapper \/>);\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Each child in an array or iterator should have a unique \"key\" prop. ' +\n       'Check the render method of InnerComponent. ' +\n       'It was passed a child from ComponentWrapper. '\n@@ -78,7 +78,7 @@ describe('ReactJSXElementValidator', function() {\n   });\n \n   it('warns for keys for iterables of elements in rest args', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var iterable = {\n       '@@iterator': function() {\n@@ -94,22 +94,22 @@ describe('ReactJSXElementValidator', function() {\n \n     <Component>{iterable}<\/Component>;\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Each child in an array or iterator should have a unique \"key\" prop.'\n     );\n   });\n \n   it('does not warns for arrays of elements with keys', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     <Component>{[<Component key=\"#1\" \/>, <Component key=\"#2\" \/>]}<\/Component>;\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not warns for iterable elements with keys', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var iterable = {\n       '@@iterator': function() {\n@@ -128,22 +128,22 @@ describe('ReactJSXElementValidator', function() {\n \n     <Component>{iterable}<\/Component>\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('warns for numeric keys on objects as children', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     <Component>{frag({1: <Component \/>, 2: <Component \/>})}<\/Component>;\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Child objects should have non-numeric keys so ordering is preserved.'\n     );\n   });\n \n   it('does not warn for numeric keys in entry iterable as a child', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var iterable = {\n       '@@iterator': function() {\n@@ -160,23 +160,23 @@ describe('ReactJSXElementValidator', function() {\n \n     <Component>{iterable}<\/Component>;\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not warn when the element is directly as children', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     <Component><Component \/><Component \/><\/Component>;\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   it('does not warn when the child array contains non-elements', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     <Component>{[ {}, {} ]}<\/Component>;\n \n-    expect(console.warn.argsForCall.length).toBe(0);\n+    expect(console.error.argsForCall.length).toBe(0);\n   });\n \n   \/\/ TODO: These warnings currently come from the composite component, but\n@@ -186,7 +186,7 @@ describe('ReactJSXElementValidator', function() {\n     \/\/ In this test, we're making sure that if a proptype error is found in a\n     \/\/ component, we give a small hint as to which parent instantiated that\n     \/\/ component as per warnings about key usage in ReactElementValidator.\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     class MyComp {\n       render() {\n         return <div>My color is {this.color}<\/div>;\n@@ -201,7 +201,7 @@ describe('ReactJSXElementValidator', function() {\n       }\n     }\n     ReactTestUtils.renderIntoDocument(<ParentComp \/>);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Invalid prop `color` of type `number` supplied to `MyComp`, ' +\n       'expected `string`. Check the render method of `ParentComp`.'\n@@ -212,24 +212,24 @@ describe('ReactJSXElementValidator', function() {\n     var Undefined = undefined;\n     var Null = null;\n     var Div = 'div';\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     <Undefined \/>;\n     <Null \/>;\n-    expect(console.warn.calls.length).toBe(2);\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe(2);\n+    expect(console.error.calls[0].args[0]).toContain(\n       'type should not be null or undefined. It should be a string (for ' +\n       'DOM elements) or a ReactClass (for composite components).'\n     );\n-    expect(console.warn.calls[1].args[0]).toContain(\n+    expect(console.error.calls[1].args[0]).toContain(\n       'type should not be null or undefined. It should be a string (for ' +\n       'DOM elements) or a ReactClass (for composite components).'\n     );\n     <Div \/>;\n-    expect(console.warn.calls.length).toBe(2);\n+    expect(console.error.calls.length).toBe(2);\n   });\n \n   it('should check default prop values', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     class Component {\n       render() {\n@@ -241,15 +241,15 @@ describe('ReactJSXElementValidator', function() {\n \n     ReactTestUtils.renderIntoDocument(<Component \/>);\n \n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Required prop `prop` was not specified in `Component`.'\n     );\n   });\n \n   it('should not check the default for explicit null', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     class Component {\n       render() {\n@@ -261,15 +261,15 @@ describe('ReactJSXElementValidator', function() {\n \n     ReactTestUtils.renderIntoDocument(<Component prop={null} \/>);\n \n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Required prop `prop` was not specified in `Component`.'\n     );\n   });\n \n   it('should check declared prop types', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     class Component {\n       render() {\n@@ -283,13 +283,13 @@ describe('ReactJSXElementValidator', function() {\n     ReactTestUtils.renderIntoDocument(<Component \/>);\n     ReactTestUtils.renderIntoDocument(<Component prop={42} \/>);\n \n-    expect(console.warn.calls.length).toBe(2);\n-    expect(console.warn.calls[0].args[0]).toBe(\n+    expect(console.error.calls.length).toBe(2);\n+    expect(console.error.calls[0].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Required prop `prop` was not specified in `Component`.'\n     );\n \n-    expect(console.warn.calls[1].args[0]).toBe(\n+    expect(console.error.calls[1].args[0]).toBe(\n       'Warning: Failed propType: ' +\n       'Invalid prop `prop` of type `number` supplied to ' +\n       '`Component`, expected `string`.'\n@@ -298,7 +298,7 @@ describe('ReactJSXElementValidator', function() {\n     ReactTestUtils.renderIntoDocument(<Component prop=\"string\" \/>);\n \n     \/\/ Should not error for strings\n-    expect(console.warn.calls.length).toBe(2);\n+    expect(console.error.calls.length).toBe(2);\n   });\n \n   it('should warn on invalid prop types', function() {\n@@ -306,7 +306,7 @@ describe('ReactJSXElementValidator', function() {\n     \/\/ for us to issue a warning earlier than element creation when the error\n     \/\/ actually occurs. Since this step is skipped in production, we should just\n     \/\/ warn instead of throwing for this case.\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     class Component {\n       render() {\n         return <span>{this.props.prop}<\/span>;\n@@ -316,15 +316,15 @@ describe('ReactJSXElementValidator', function() {\n       prop: null\n     };\n     ReactTestUtils.renderIntoDocument(<Component \/>);\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toContain(\n       'Invariant Violation: Component: prop type `prop` is invalid; ' +\n       'it must be a function, usually from React.PropTypes.'\n     );\n   });\n \n   it('should warn on invalid context types', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     class Component {\n       render() {\n         return <span>{this.props.prop}<\/span>;\n@@ -334,15 +334,15 @@ describe('ReactJSXElementValidator', function() {\n       prop: null\n     };\n     ReactTestUtils.renderIntoDocument(<Component \/>);\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toContain(\n       'Invariant Violation: Component: context type `prop` is invalid; ' +\n       'it must be a function, usually from React.PropTypes.'\n     );\n   });\n \n   it('should warn if getDefaultProps is specificed on the class', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     class Component {\n       render() {\n         return <span>{this.props.prop}<\/span>;\n@@ -352,8 +352,8 @@ describe('ReactJSXElementValidator', function() {\n       prop: 'foo'\n     });\n     ReactTestUtils.renderIntoDocument(<Component \/>);\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toContain(\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toContain(\n       'getDefaultProps is only used on classic React.createClass definitions.' +\n       ' Use a static property named `defaultProps` instead.'\n     );\ndiff --git a\/src\/test\/__tests__\/ReactTestUtils-test.js b\/src\/test\/__tests__\/ReactTestUtils-test.js\nindex 08789cda29..248c19d151 100644\n--- a\/src\/test\/__tests__\/ReactTestUtils-test.js\n+++ b\/src\/test\/__tests__\/ReactTestUtils-test.js\n@@ -25,12 +25,12 @@ describe('ReactTestUtils', function() {\n     React = require('React');\n     ReactTestUtils = require('ReactTestUtils');\n \n-    warn = console.warn;\n-    console.warn = mocks.getMockFunction();\n+    warn = console.error;\n+    console.error = mocks.getMockFunction();\n   });\n \n   afterEach(function() {\n-    console.warn = warn;\n+    console.error = warn;\n   });\n \n   it('should have shallow rendering', function() {\n@@ -193,7 +193,7 @@ describe('ReactTestUtils', function() {\n       }\n     }\n \n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var foo = ReactTestUtils.renderIntoDocument(<Foo \/>);\n     expect(ReactTestUtils.isDOMComponent(foo)).toBe(false);\n@@ -204,7 +204,7 @@ describe('ReactTestUtils', function() {\n     var div = ReactTestUtils.renderIntoDocument(<div \/>);\n     expect(ReactTestUtils.isDOMComponent(div)).toBe(true);\n \n-    expect(console.warn.calls.length).toBe(0);\n+    expect(console.error.calls.length).toBe(0);\n   });\n \n   it('should support injected wrapper components as DOM components', function() {\ndiff --git a\/src\/utils\/__tests__\/ReactChildren-test.js b\/src\/utils\/__tests__\/ReactChildren-test.js\nindex 80d266f774..62c943cfcb 100644\n--- a\/src\/utils\/__tests__\/ReactChildren-test.js\n+++ b\/src\/utils\/__tests__\/ReactChildren-test.js\n@@ -350,10 +350,10 @@ describe('ReactChildren', function() {\n       <div>{zero}{one}<\/div>\n     );\n \n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var mapped = ReactChildren.map(instance.props.children, mapFn);\n \n-    expect(console.warn.calls.length).toEqual(1);\n+    expect(console.error.calls.length).toEqual(1);\n     expect(nthChild(mapped, 0)).toBe(zero);\n     expect(keyOfNthChild(mapped, 0)).toBe('.$something');\n   });\n@@ -422,17 +422,17 @@ describe('ReactChildren', function() {\n   });\n \n   it('should warn if a fragment is used without the wrapper', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var child = React.createElement('span');\n     ReactChildren.forEach({a: child, b: child}, function(c) {\n       expect(c).toBe(child);\n     });\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toContain('use of a keyed object');\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toContain('use of a keyed object');\n   });\n \n   it('should warn if a fragment is accessed', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n     var child = React.createElement('span');\n     var frag = ReactChildren.map([child, child], function(c) {\n       return c;\n@@ -441,8 +441,8 @@ describe('ReactChildren', function() {\n       frag[key];\n       break;\n     }\n-    expect(console.warn.calls.length).toBe(1);\n-    expect(console.warn.calls[0].args[0]).toContain('is an opaque type');\n+    expect(console.error.calls.length).toBe(1);\n+    expect(console.error.calls[0].args[0]).toContain('is an opaque type');\n \n     var frag2 = ReactChildren.map([child, child], function(c) {\n       return c;\n@@ -451,8 +451,8 @@ describe('ReactChildren', function() {\n       frag2[key] = 123;\n       break;\n     }\n-    expect(console.warn.calls.length).toBe(2);\n-    expect(console.warn.calls[1].args[0]).toContain('is an immutable opaque');\n+    expect(console.error.calls.length).toBe(2);\n+    expect(console.error.calls[1].args[0]).toContain('is an immutable opaque');\n   });\n \n });\ndiff --git a\/src\/utils\/__tests__\/cloneWithProps-test.js b\/src\/utils\/__tests__\/cloneWithProps-test.js\nindex ef42d5e4fd..9ef5d7fa12 100644\n--- a\/src\/utils\/__tests__\/cloneWithProps-test.js\n+++ b\/src\/utils\/__tests__\/cloneWithProps-test.js\n@@ -82,7 +82,7 @@ describe('cloneWithProps', function() {\n   });\n \n   it('should warn when cloning with refs', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var Grandparent = React.createClass({\n       render: function() {\n@@ -101,7 +101,7 @@ describe('cloneWithProps', function() {\n \n     var component = ReactTestUtils.renderIntoDocument(<Grandparent \/>);\n     expect(component.refs).toBe(emptyObject);\n-    expect(console.warn.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall.length).toBe(1);\n   });\n \n   it('should transfer the key property', function() {\ndiff --git a\/src\/utils\/__tests__\/traverseAllChildren-test.js b\/src\/utils\/__tests__\/traverseAllChildren-test.js\nindex ce92d42dde..4990fcad0a 100644\n--- a\/src\/utils\/__tests__\/traverseAllChildren-test.js\n+++ b\/src\/utils\/__tests__\/traverseAllChildren-test.js\n@@ -396,7 +396,7 @@ describe('traverseAllChildren', function() {\n   });\n \n   it('should use keys from entry iterables', function() {\n-    spyOn(console, 'warn');\n+    spyOn(console, 'error');\n \n     var threeDivEntryIterable = {\n       '@@iterator': function() {\n@@ -448,8 +448,8 @@ describe('traverseAllChildren', function() {\n       2\n     );\n \n-    expect(console.warn.argsForCall.length).toBe(1);\n-    expect(console.warn.argsForCall[0][0]).toContain(\n+    expect(console.error.argsForCall.length).toBe(1);\n+    expect(console.error.argsForCall[0][0]).toContain(\n       'Warning: Using Maps as children is not yet fully supported. It is an ' +\n       'experimental feature that might be removed. Convert it to a sequence ' +\n       '\/ iterable of keyed ReactElements instead.'\ndiff --git a\/src\/vendor\/core\/warning.js b\/src\/vendor\/core\/warning.js\nindex 2d0e9c7eb8..90365feb7c 100644\n--- a\/src\/vendor\/core\/warning.js\n+++ b\/src\/vendor\/core\/warning.js\n@@ -46,7 +46,7 @@ if (__DEV__) {\n       var argIndex = 0;\n       var message = 'Warning: ' + format.replace(\/%s\/g, () => args[argIndex++]);\n       if (typeof console !== 'undefined') {\n-        console.warn(message);\n+        console.error(message);\n       }\n       try {\n         \/\/ --- Welcome to debugging React ---\n","commit":{"authorName":"Ben Alpert","subject":"Use console.error to show stack trace in console","revision":"e791fccf5833450fff2929416174d489b9785e37","authoredAt":"2015-03-17T13:39:04-07:00","authorEmail":"balpert@fb.com","shortRevision":"e791fccf58"},"parents":["9a6fa5eb7db5b93f63e18147966b9919e60ddacf"]}</article></body></html>

dillon1000/react

Files changed