added util tests for some methods

lib/util.js

@@ -575,7 +575,7 @@ module.exports = {
       paramType;
 
     if (!param) {
-      return '';
+      return [];
     }
     // check for existence of schema
     if (param.hasOwnProperty('schema')) {
@@ -978,6 +978,9 @@ module.exports = {
 
     // console.log("path params = ", reqParams.path, pathVarArray)
     _.forEach(reqParams.query, (queryParam) => {
+      if (queryParam.$ref) {
+        queryParam = this.getRefObject(queryParam.$ref);
+      }
       this.convertToPmQueryParameters(queryParam).forEach((pmParam) => {
         item.request.url.addQueryParams(pmParam);
       });