diff --git a/app.js b/app.js
index 39e2927..87993a2 100644
--- a/app.js
+++ b/app.js
@@ -56,12 +56,18 @@ var console = {
         }
         return res;
     },
+    _echoCallback: null,
     _echo: function(args, type) {
         msg = (typeof(type) !== "undefined" ? type + ": " : "") + this._join(args);
         if (typeof(WScript) !== "undefined") {
             WScript.echo("  * " + msg);
         }
         this._messages.push(msg);
+
+        // after calling echo
+        if (typeof this._echoCallback === "function") {
+            _echoCallback(this);
+        }
     },
     assert: function(assertion) {
         if (arguments.length > 1 && assertion === arguments[0]) {