diff --git a/notebook/tests/base/utils.js b/notebook/tests/base/utils.js
index fe5c878fe..7e7fdbfba 100644
--- a/notebook/tests/base/utils.js
+++ b/notebook/tests/base/utils.js
@@ -20,4 +20,16 @@ casper.notebook_test(function () {
     }, input);
 
     this.test.assertEquals(result, output, "IPython.utils.fixConsole() handles [0m correctly");
+    
+    this.thenEvaluate(function() {
+        define('a', [], function() { window.a = true; });
+        define('c', [], function() { window.c = true; });
+        require(['base/js/utils'], function(utils) {
+            utils.load_extensions('a', 'b', 'c');
+        });
+    });
+    
+    this.waitFor(function() {
+        return this.evaluate(function() { return window.a && window.c; });
+    });
 });