More test + fix decodeURIComponent call

Previously I was calling decodeURIComponent on regex match result which
was an array. This fixes that and alos adds more tests

src/main/html/index.html

@@ -24,9 +24,9 @@
   <script src='lib/swagger-oauth.js' type='text/javascript'></script>
   <script type="text/javascript">
     $(function () {
-      var url = decodeURIComponent(window.location.search.match(/url=([^&]+)/));
+      var url = window.location.search.match(/url=([^&]+)/);
       if (url && url.length > 1) {
-        url = url[1];
+        url = decodeURIComponent(url[1]);
       } else {
         url = "http://petstore.swagger.wordnik.com/v2/swagger.json";
       }