diff --git a/test/test.js b/test/test.js
index 4b3dd79f..70b5db8e 100644
--- a/test/test.js
+++ b/test/test.js
@@ -7,6 +7,7 @@ describe('xterm.js', function() {
 
   beforeEach(function () {
     xterm = new Terminal();
+    xterm.refresh = function(){};
   });
 
   describe('evaluateKeyEscapeSequence', function() {