diff --git a/Wox.Core/Plugin/PluginManager.cs b/Wox.Core/Plugin/PluginManager.cs
index e42cf02e80..d6806e5cb2 100644
--- a/Wox.Core/Plugin/PluginManager.cs
+++ b/Wox.Core/Plugin/PluginManager.cs
@@ -135,7 +135,7 @@ namespace Wox.Core.Plugin
             var rawQuery = string.Join(Query.TermSeperater, terms);
             var actionKeyword = string.Empty;
             var search = rawQuery;
-            List<string> actionParameters = terms.ToList();
+            var actionParameters = terms.ToList();
             if (terms.Length == 0) return null;
             if (NonGlobalPlugins.ContainsKey(terms[0]) &&
                 !Settings.Plugins[NonGlobalPlugins[terms[0]].Metadata.ID].Disabled)
diff --git a/Wox.Plugin/Query.cs b/Wox.Plugin/Query.cs
index 400ae741f1..4289f0497d 100644
--- a/Wox.Plugin/Query.cs
+++ b/Wox.Plugin/Query.cs
@@ -6,6 +6,19 @@ namespace Wox.Plugin
 {
     public class Query
     {
+        internal Query() { }
+
+        /// <summary>
+        /// to allow unit tests for plug ins
+        /// </summary>
+        public Query(string rawQuery, string search, string[] terms, string actionKeyword = null)
+        {
+            Search = search;
+            RawQuery = rawQuery;
+            Terms = terms;
+            ActionKeyword = actionKeyword;
+        }
+
         /// <summary>
         /// Raw query, this includes action keyword if it has
         /// We didn't recommend use this property directly. You should always use Search property.