diff --git a/test/tests.js b/test/tests.js
index 08c895d..f37d732 100644
--- a/test/tests.js
+++ b/test/tests.js
@@ -1,25 +1,16 @@
-var userAgentsToTest = [
-	{
-		ua: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36',
-		b: 'chrome',
-		bv: '31',
-		os: 'mac',
-		osv: 'os x'
-	},
-	{
-		ua: 'Mozilla/5.0 (Linux; U; Android 4.0.3; de-de; Build/20120717) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Safari/534.30',
-		b: 'safari',
-		bv: '4',
-		os: 'android',
-		osv: '4'
-	}
-];
-
-function changeUserAgent(newUserAgent) {
-	window.navigator = {
-		userAgent: newUserAgent
-	}
-}
+var userAgentsToTest = [{
+	ua: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36',
+	b: 'chrome',
+	bv: '31',
+	os: 'mac',
+	osv: 'os x'
+}, {
+	ua: 'Mozilla/5.0 (Linux; U; Android 4.0.3; de-de; Build/20120717) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Safari/534.30',
+	b: 'safari',
+	bv: '4',
+	os: 'android',
+	osv: '4'
+}];
 
 function isUserAgentTestOk(userAgentToTest) {
 	if (userAgentToTest.os == Modernizr.Detectizr.device.os && Modernizr.Detectizr.device.osVersion == userAgentToTest.osv && Modernizr.Detectizr.device.browser == userAgentToTest.b && Modernizr.Detectizr.device.browserVersion == userAgentToTest.bv) {
@@ -28,27 +19,26 @@ function isUserAgentTestOk(userAgentToTest) {
 	return false;
 }
 
-test('is Detectizr ready', function() {
+test('is Detectizr ready', function () {
 	Modernizr.Detectizr.detect();
 	notEqual(Modernizr.Detectizr.device, undefined);
 });
 
-test('useragent tests', function() {
+test('useragent tests', function () {
 	for (var i = userAgentsToTest.length - 1; i >= 0; i--) {
-		changeUserAgent(userAgentsToTest[i].ua);
-        Modernizr.Detectizr.device = {
-            type: '',
-            model: '',
-            orientation: '',
-            browser: '',
-            browserEngine: '',
-            browserPlugins: [],
-            browserVersion: '',
-            os: '',
-            osVersion: '',
-            osVersionFull: '',
-            userAgent: (navigator.userAgent || navigator.vendor || window.opera).toLowerCase()
-        };
+		Modernizr.Detectizr.device = {
+			type: '',
+			model: '',
+			orientation: '',
+			browser: '',
+			browserEngine: '',
+			browserPlugins: [],
+			browserVersion: '',
+			os: '',
+			osVersion: '',
+			osVersionFull: '',
+			userAgent: userAgentsToTest[i].ua.toLowerCase()
+		};
 		Modernizr.Detectizr.detect();
 		ok(isUserAgentTestOk(userAgentsToTest[i]), userAgentsToTest[i].ua);
 	}