diff --git a/dist/symbol-es6.min.js b/dist/symbol-es6.min.js
index b218087..9e3e8b6 100644
--- a/dist/symbol-es6.min.js
+++ b/dist/symbol-es6.min.js
@@ -1 +1 @@
-!function(global,factory){"use strict";"object"==typeof module&&"object"==typeof module.exports?module.exports=factory(global):factory(global)}("undefined"!=typeof window?window:global,function(global){"use strict";var defineProperty=Object.defineProperty,defineProperties=Object.defineProperties,symbolHiddenCounter=0,globalSymbolRegistry=[],slice=Array.prototype.slice,ES6="object"==typeof global.ES6?global.ES6:global.ES6={},isArray=Array.isArray,objectToString=Object.prototype.toString,push=Array.prototype.push,emptyFunction=function(){},simpleFunction=function(arg){return arg},isCallable=function(fn){return"function"==typeof fn},Iterator=function(){},ArrayIterator=function(array,flag){this._array=array,this._flag=flag,this._nextIndex=0},StringIterator=function(string,flag){this._string=string,this._flag=flag,this._nextIndex=0},isObject=function(value){return null!==value&&("object"==typeof value||"function"==typeof value)},setupSymbolInternals=function(symbol,desc){return defineProperties(symbol,{_description:{value:desc},_isSymbol:{value:!0},_id:{value:symbolHiddenCounter++}}),symbol},appendArray=function(array1,array2){if("number"==typeof array1.length&&array1.length>=0&&"number"==typeof array2.length&&array2.length>=0){var length1=Math.floor(array1.length),length2=Math.floor(array2.length),i=0;for(array1.length=length1+length2;i<length2;++i)array2.hasOwnProperty(i)&&(array1[length1+i]=array2[i])}},simpleInheritance=function(child,parent){if("function"!=typeof child||"function"!=typeof parent)throw new TypeError("Child and Parent must be function type");child.prototype=Object.create(parent.prototype),child.prototype.constructor=child},Symbol=function Symbol(desc){if(desc=void 0===desc?"":String(desc),this instanceof Symbol)throw new TypeError("Symbol is not a constructor");return setupSymbolInternals(Object.create(Symbol.prototype),desc)};defineProperties(Symbol,{for:{value:function(key){key=String(key);for(var record,registryLength=globalSymbolRegistry.length,i=0;i<registryLength;++i)if((record=globalSymbolRegistry[i]).key===key)return record.symbol;return record={key:key,symbol:Symbol(key)},globalSymbolRegistry.push(record),record.symbol},writable:!0,configurable:!0},keyFor:{value:function(symbol){if(!ES6.isSymbol(symbol))throw new TypeError(String(symbol)+" is not a symbol");for(var record,registryLength=globalSymbolRegistry.length,i=0;i<registryLength;++i)if((record=globalSymbolRegistry[i]).symbol===symbol)return record.key},writable:!0,configurable:!0},hasInstance:{value:Symbol("Symbol.hasInstance")},isConcatSpreadable:{value:Symbol("Symbol.isConcatSpreadable")},iterator:{value:Symbol("Symbol.iterator")},toStringTag:{value:Symbol("Symbol.toStringTag")}}),Symbol.prototype.toString=function(){return"@@_____"+this._id+"_____"},Symbol.prototype.valueOf=function(){return this},defineProperty(Iterator.prototype,Symbol.iterator.toString(),{value:function(){return this},writable:!0,configurable:!0}),simpleInheritance(ArrayIterator,Iterator),simpleInheritance(StringIterator,Iterator),defineProperty(ArrayIterator.prototype,Symbol.toStringTag.toString(),{value:"Array Iterator",configurable:!0}),defineProperty(StringIterator.prototype,Symbol.toStringTag.toString(),{value:"String Iterator",configurable:!0}),ArrayIterator.prototype.next=function(){if(!(this instanceof ArrayIterator))throw new TypeError("Method Array Iterator.prototype.next called on incompatible receiver "+String(this));var nextValue;return-1===this._nextIndex?{done:!0,value:void 0}:"number"==typeof this._array.length&&this._array.length>=0&&this._nextIndex<Math.floor(this._array.length)?(1===this._flag?nextValue=[this._nextIndex,this._array[this._nextIndex]]:2===this._flag?nextValue=this._array[this._nextIndex]:3===this._flag&&(nextValue=this._nextIndex),this._nextIndex++,{done:!1,value:nextValue}):(this._nextIndex=-1,{done:!0,value:void 0})},StringIterator.prototype.next=function(){if(!(this instanceof StringIterator))throw new TypeError("Method String Iterator.prototype.next called on incompatible receiver "+String(this));var nextValue,stringObject=new String(this._string);return-1===this._nextIndex?{done:!0,value:void 0}:this._nextIndex<stringObject.length?(nextValue=stringObject[this._nextIndex],this._nextIndex++,{done:!1,value:nextValue}):(this._nextIndex=-1,{done:!0,value:void 0})};var SpreadOperatorImpl=function(target,thisArg){this._target=target,this._values=[],this._thisArg=thisArg};SpreadOperatorImpl.prototype.spread=function(){var self=this;return slice.call(arguments).forEach(function(iterable){ES6.forOf(iterable,function(value){self._values.push(value)})}),self},SpreadOperatorImpl.prototype.add=function(){var self=this;return slice.call(arguments).forEach(function(value){self._values.push(value)}),self},SpreadOperatorImpl.prototype.call=function(thisArg){if("function"!=typeof this._target)throw new TypeError("Target is not a function");return thisArg=arguments.length<=0?this._thisArg:thisArg,this._target.apply(thisArg,this._values)},SpreadOperatorImpl.prototype.new=function(){if("function"!=typeof this._target)throw new TypeError("Target is not a constructor");var temp,returnValue;return temp=Object.create(this._target.prototype),returnValue=this._target.apply(temp,this._values),isObject(returnValue)?returnValue:temp},SpreadOperatorImpl.prototype.array=function(){if(!isArray(this._target))throw new TypeError("Target is not a array");return push.apply(this._target,this._values),this._target};return defineProperties(ES6,{isSymbol:{value:function(symbol){return symbol instanceof Symbol&&function(symbol){return!0===symbol._isSymbol&&"number"==typeof symbol._id&&"string"==typeof symbol._description}(symbol)},writable:!0,configurable:!0},instanceOf:{value:function(object,constructor){if(!isObject(constructor))throw new TypeError("Right-hand side of 'instanceof' is not an object");var hasInstanceSymbolProp=constructor[Symbol.hasInstance];if(void 0===hasInstanceSymbolProp)return object instanceof constructor;if("function"!=typeof hasInstanceSymbolProp)throw new TypeError(typeof hasInstanceSymbolProp+" is not a function");return hasInstanceSymbolProp.call(constructor,object)},writable:!0,configurable:!0},forOf:{value:function(iterable,callback,thisArg){if(callback="function"!=typeof callback?emptyFunction:callback,"function"!=typeof iterable[Symbol.iterator])throw new TypeError("Iterable[Symbol.iterator] is not a function");var iterationResult,iterator=iterable[Symbol.iterator]();if("function"!=typeof iterator.next)throw new TypeError(".iterator.next is not a function");for(;;){if(iterationResult=iterator.next(),!isObject(iterationResult))throw new TypeError("Iterator result "+iterationResult+" is not an object");if(iterationResult.done)break;callback.call(thisArg,iterationResult.value)}},writable:!0,configurable:!0},spreadOperator:{value:function(target,thisArg){if("function"!=typeof target&&!isArray(target))throw new TypeError("Spread operator only supports on array and function objects at this moment");return new SpreadOperatorImpl(target,thisArg)},writable:!0,configurable:!0}}),defineProperty(global,"Symbol",{value:Symbol,writable:!0,configurable:!0}),defineProperty(Function.prototype,Symbol.hasInstance.toString(),{value:function(instance){return"function"==typeof this&&instance instanceof this}}),defineProperty(Array.prototype,"concat",{value:function(){if(void 0===this||null===this)throw new TypeError("Array.prototype.concat called on null or undefined");var self=Object(this),targets=slice.call(arguments),outputs=[];return targets.unshift(self),targets.forEach(function(target){isObject(target)?void 0!==target[Symbol.isConcatSpreadable]?target[Symbol.isConcatSpreadable]?appendArray(outputs,target):outputs.push(target):isArray(target)?appendArray(outputs,target):outputs.push(target):outputs.push(target)}),outputs},writable:!0,configurable:!0}),defineProperty(Object.prototype,"toString",{value:function(){return void 0===this||null===this?objectToString.call(this):"string"==typeof this[Symbol.toStringTag]?"[object "+this[Symbol.toStringTag]+"]":objectToString.call(this)},writable:!0,configurable:!0}),defineProperty(Array.prototype,Symbol.iterator.toString(),{value:function(){if(void 0===this||null===this)throw new TypeError("Cannot convert undefined or null to object");var self=Object(this);return new ArrayIterator(self,2)},writable:!0,configurable:!0}),defineProperty(Array,"from",{value:function(arrayLike,mapFn,thisArg){var constructor,length,outputs,i=0;if(constructor=isCallable(this)?this:Array,void 0===arrayLike||null===arrayLike)throw new TypeError("Cannot convert undefined or null to object");if(arrayLike=Object(arrayLike),void 0===mapFn)mapFn=simpleFunction;else if(!isCallable(mapFn))throw new TypeError(mapFn+" is not a function");if(void 0===arrayLike[Symbol.iterator]){if(!("number"==typeof arrayLike.length&&arrayLike.length>=0))return(outputs=new constructor(0)).length=0,outputs;for(length=Math.floor(arrayLike.length),(outputs=new constructor(length)).length=length;i<length;++i)outputs[i]=mapFn.call(thisArg,arrayLike[i])}else(outputs=new constructor).length=0,ES6.forOf(arrayLike,function(value){outputs.length++,outputs[outputs.length-1]=mapFn.call(thisArg,value)});return outputs},writable:!0,configurable:!0}),defineProperty(Array.prototype,"entries",{value:function(){if(void 0===this||null===this)throw new TypeError("Cannot convert undefined or null to object");var self=Object(this);return new ArrayIterator(self,1)},writable:!0,configurable:!0}),defineProperty(Array.prototype,"keys",{value:function(){if(void 0===this||null===this)throw new TypeError("Cannot convert undefined or null to object");var self=Object(this);return new ArrayIterator(self,3)},writable:!0,configurable:!0}),defineProperty(String.prototype,Symbol.iterator.toString(),{value:function(){if(void 0===this||null===this)throw new TypeError("String.prototype[Symbol.iterator] called on null or undefined");return new StringIterator(String(this),0)},writable:!0,configurable:!0}),ES6});
\ No newline at end of file
+!function(global,factory){"use strict";"object"==typeof module&&"object"==typeof module.exports?module.exports=factory(global):factory(global)}("undefined"!=typeof window?window:global,function(global){"use strict";function emptyFunction(){}function simpleFunction(arg){return arg}function isCallable(fn){return"function"==typeof fn}function Iterator(){}function isObject(value){return null!==value&&("object"==typeof value||"function"==typeof value)}function setupSymbolInternals(symbol,desc){return defineProperties(symbol,{_description:{value:desc},_isSymbol:{value:!0},_id:{value:symbolHiddenCounter++}}),symbol}function appendArray(array1,array2){if("number"==typeof array1.length&&0<=array1.length&&"number"==typeof array2.length&&0<=array2.length){var length1=Math.floor(array1.length),length2=Math.floor(array2.length),i=0;for(array1.length=length1+length2;i<length2;++i)array2.hasOwnProperty(i)&&(array1[length1+i]=array2[i])}}function simpleInheritance(child,parent){if("function"!=typeof child||"function"!=typeof parent)throw new TypeError("Child and Parent must be function type");child.prototype=Object.create(parent.prototype),child.prototype.constructor=child}var defineProperty=Object.defineProperty,defineProperties=Object.defineProperties,symbolHiddenCounter=0,globalSymbolRegistry=[],slice=Array.prototype.slice,ES6="object"==typeof global.ES6?global.ES6:global.ES6={},isTestMode=global.symbolES6TestingMode||!1,isArray=Array.isArray,objectToString=Object.prototype.toString,push=Array.prototype.push,ArrayIterator=function(array,flag){this._array=array,this._flag=flag,this._nextIndex=0},StringIterator=function(string,flag){this._string=string,this._flag=flag,this._nextIndex=0},Symbol=function Symbol(desc){if(desc=void 0===desc?"":String(desc),this instanceof Symbol)throw new TypeError("Symbol is not a constructor");return setupSymbolInternals(Object.create(Symbol.prototype),desc)};defineProperties(Symbol,{for:{value:function(key){key=String(key);for(var record,registryLength=globalSymbolRegistry.length,i=0;i<registryLength;++i)if((record=globalSymbolRegistry[i]).key===key)return record.symbol;return record={key:key,symbol:Symbol(key)},globalSymbolRegistry.push(record),record.symbol},writable:!0,configurable:!0},keyFor:{value:function(symbol){if(!ES6.isSymbol(symbol))throw new TypeError(String(symbol)+" is not a symbol");for(var record,registryLength=globalSymbolRegistry.length,i=0;i<registryLength;++i)if((record=globalSymbolRegistry[i]).symbol===symbol)return record.key},writable:!0,configurable:!0},hasInstance:{value:Symbol("Symbol.hasInstance")},isConcatSpreadable:{value:Symbol("Symbol.isConcatSpreadable")},iterator:{value:Symbol("Symbol.iterator")},toStringTag:{value:Symbol("Symbol.toStringTag")}}),Symbol.prototype.toString=function(){return"@@_____"+this._id+"_____"},Symbol.prototype.valueOf=function(){return this},defineProperty(Iterator.prototype,Symbol.iterator.toString(),{value:function(){return this},writable:!0,configurable:!0}),simpleInheritance(ArrayIterator,Iterator),simpleInheritance(StringIterator,Iterator),defineProperty(ArrayIterator.prototype,Symbol.toStringTag.toString(),{value:"Array Iterator",configurable:!0}),defineProperty(StringIterator.prototype,Symbol.toStringTag.toString(),{value:"String Iterator",configurable:!0}),ArrayIterator.prototype.next=function(){if(!(this instanceof ArrayIterator))throw new TypeError("Method Array Iterator.prototype.next called on incompatible receiver "+String(this));var nextValue;return-1===this._nextIndex?{done:!0,value:void 0}:"number"==typeof this._array.length&&0<=this._array.length&&this._nextIndex<Math.floor(this._array.length)?(1===this._flag?nextValue=[this._nextIndex,this._array[this._nextIndex]]:2===this._flag?nextValue=this._array[this._nextIndex]:3===this._flag&&(nextValue=this._nextIndex),this._nextIndex++,{done:!1,value:nextValue}):(this._nextIndex=-1,{done:!0,value:void 0})},StringIterator.prototype.next=function(){if(!(this instanceof StringIterator))throw new TypeError("Method String Iterator.prototype.next called on incompatible receiver "+String(this));var nextValue,stringObject=new String(this._string);return-1===this._nextIndex?{done:!0,value:void 0}:this._nextIndex<stringObject.length?(nextValue=stringObject[this._nextIndex],this._nextIndex++,{done:!1,value:nextValue}):(this._nextIndex=-1,{done:!0,value:void 0})};function SpreadOperatorImpl(target,thisArg){this._target=target,this._values=[],this._thisArg=thisArg}SpreadOperatorImpl.prototype.spread=function(){var self=this;return slice.call(arguments).forEach(function(iterable){ES6.forOf(iterable,function(value){self._values.push(value)})}),self},SpreadOperatorImpl.prototype.add=function(){var self=this;return slice.call(arguments).forEach(function(value){self._values.push(value)}),self},SpreadOperatorImpl.prototype.call=function(thisArg){if("function"!=typeof this._target)throw new TypeError("Target is not a function");return thisArg=arguments.length<=0?this._thisArg:thisArg,this._target.apply(thisArg,this._values)},SpreadOperatorImpl.prototype.new=function(){if("function"!=typeof this._target)throw new TypeError("Target is not a constructor");var temp,returnValue;return temp=Object.create(this._target.prototype),returnValue=this._target.apply(temp,this._values),isObject(returnValue)?returnValue:temp},SpreadOperatorImpl.prototype.array=function(){if(!isArray(this._target))throw new TypeError("Target is not a array");return push.apply(this._target,this._values),this._target};return function(){if(isTestMode)return!1;var isSymbolSupported=!1;if("function"==typeof Symbol)try{Symbol(),isSymbolSupported=!0}catch(ignore){}else isSymbolSupported=!1;return isSymbolSupported}()||(defineProperties(ES6,{isSymbol:{value:function(symbol){return symbol instanceof Symbol&&function(symbol){return!0===symbol._isSymbol&&"number"==typeof symbol._id&&"string"==typeof symbol._description}(symbol)},writable:!0,configurable:!0},instanceOf:{value:function(object,constructor){if(!isObject(constructor))throw new TypeError("Right-hand side of 'instanceof' is not an object");var hasInstanceSymbolProp=constructor[Symbol.hasInstance];if(void 0===hasInstanceSymbolProp)return object instanceof constructor;if("function"!=typeof hasInstanceSymbolProp)throw new TypeError(typeof hasInstanceSymbolProp+" is not a function");return hasInstanceSymbolProp.call(constructor,object)},writable:!0,configurable:!0},forOf:{value:function(iterable,callback,thisArg){if(callback="function"!=typeof callback?emptyFunction:callback,"function"!=typeof iterable[Symbol.iterator])throw new TypeError("Iterable[Symbol.iterator] is not a function");var iterationResult,iterator=iterable[Symbol.iterator]();if("function"!=typeof iterator.next)throw new TypeError(".iterator.next is not a function");for(;;){if(iterationResult=iterator.next(),!isObject(iterationResult))throw new TypeError("Iterator result "+iterationResult+" is not an object");if(iterationResult.done)break;callback.call(thisArg,iterationResult.value)}},writable:!0,configurable:!0},spreadOperator:{value:function(target,thisArg){if("function"!=typeof target&&!isArray(target))throw new TypeError("Spread operator only supports on array and function objects at this moment");return new SpreadOperatorImpl(target,thisArg)},writable:!0,configurable:!0}}),defineProperty(global,"Symbol",{value:Symbol,writable:!0,configurable:!0}),defineProperty(Function.prototype,Symbol.hasInstance.toString(),{value:function(instance){return"function"==typeof this&&instance instanceof this}}),defineProperty(Array.prototype,"concat",{value:function(){if(null==this)throw new TypeError("Array.prototype.concat called on null or undefined");var self=Object(this),targets=slice.call(arguments),outputs=[];return targets.unshift(self),targets.forEach(function(target){isObject(target)?void 0!==target[Symbol.isConcatSpreadable]?target[Symbol.isConcatSpreadable]?appendArray(outputs,target):outputs.push(target):isArray(target)?appendArray(outputs,target):outputs.push(target):outputs.push(target)}),outputs},writable:!0,configurable:!0}),defineProperty(Object.prototype,"toString",{value:function(){return null==this?objectToString.call(this):"string"==typeof this[Symbol.toStringTag]?"[object "+this[Symbol.toStringTag]+"]":objectToString.call(this)},writable:!0,configurable:!0}),defineProperty(Array.prototype,Symbol.iterator.toString(),{value:function(){if(null==this)throw new TypeError("Cannot convert undefined or null to object");var self=Object(this);return new ArrayIterator(self,2)},writable:!0,configurable:!0}),defineProperty(Array,"from",{value:function(arrayLike,mapFn,thisArg){var constructor,length,outputs,i=0;if(constructor=isCallable(this)?this:Array,null==arrayLike)throw new TypeError("Cannot convert undefined or null to object");if(arrayLike=Object(arrayLike),void 0===mapFn)mapFn=simpleFunction;else if(!isCallable(mapFn))throw new TypeError(mapFn+" is not a function");if(void 0===arrayLike[Symbol.iterator]){if(!("number"==typeof arrayLike.length&&0<=arrayLike.length))return(outputs=new constructor(0)).length=0,outputs;for(length=Math.floor(arrayLike.length),(outputs=new constructor(length)).length=length;i<length;++i)outputs[i]=mapFn.call(thisArg,arrayLike[i])}else(outputs=new constructor).length=0,ES6.forOf(arrayLike,function(value){outputs.length++,outputs[outputs.length-1]=mapFn.call(thisArg,value)});return outputs},writable:!0,configurable:!0}),defineProperty(Array.prototype,"entries",{value:function(){if(null==this)throw new TypeError("Cannot convert undefined or null to object");var self=Object(this);return new ArrayIterator(self,1)},writable:!0,configurable:!0}),defineProperty(Array.prototype,"keys",{value:function(){if(null==this)throw new TypeError("Cannot convert undefined or null to object");var self=Object(this);return new ArrayIterator(self,3)},writable:!0,configurable:!0}),defineProperty(String.prototype,Symbol.iterator.toString(),{value:function(){if(null==this)throw new TypeError("String.prototype[Symbol.iterator] called on null or undefined");return new StringIterator(String(this),0)},writable:!0,configurable:!0})),ES6});
\ No newline at end of file
diff --git a/dist/symbol-es6.min.js.map b/dist/symbol-es6.min.js.map
index 7ac8e24..4362d65 100644
--- a/dist/symbol-es6.min.js.map
+++ b/dist/symbol-es6.min.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/package.json b/package.json
index 5b0e201..845daae 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "symbol-es6",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "ES6 Symbol polyfill in pure ES5",
   "main": "symbol-es6.js",
   "scripts": {
diff --git a/symbol-es6.js b/symbol-es6.js
index ab31a1c..202240b 100644
--- a/symbol-es6.js
+++ b/symbol-es6.js
@@ -38,6 +38,8 @@
 
     var ES6 = typeof global.ES6 === "object" ? global.ES6 : (global.ES6 = {});
 
+    var isTestMode = global.symbolES6TestingMode || false;
+    
     var isArray = Array.isArray;
 
     var objectToString = Object.prototype.toString;
@@ -73,7 +75,19 @@
     };
 
     var isES6Running = function() {
-        return false; /* Now 'false' for testing purpose */
+        if (isTestMode)
+            return false;
+        
+        var isSymbolSupported = false;
+        if (typeof Symbol === "function") {
+            try {
+                Symbol();
+                isSymbolSupported = true;
+            } catch (ignore) {}
+        } else {
+            isSymbolSupported = false;
+        }
+        return isSymbolSupported; /* Now 'false' for testing purpose */
     };
 
     var isObject = function (value) {
diff --git a/test/index.html b/test/index.html
index c23c9d3..50d279f 100644
--- a/test/index.html
+++ b/test/index.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>Title</title>
+    <script>window.symbolES6TestingMode = true;</script>
     <script src="../symbol-es6.js"></script>
 </head>
 <body>
diff --git a/test/test.js b/test/test.js
index d336f8c..37ec763 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,5 +1,5 @@
 "use strict";
-
+global.symbolES6TestingMode = true
 var ES6 = require("../symbol-es6");
 
 console.log(Symbol("bar") === Symbol("bar")); //false