diff --git a/IPython/html/tests/widgets/widget_button.js b/IPython/html/tests/widgets/widget_button.js
index 80f8673..673ad3b 100644
--- a/IPython/html/tests/widgets/widget_button.js
+++ b/IPython/html/tests/widgets/widget_button.js
@@ -39,7 +39,9 @@ casper.notebook_test(function () {
     this.wait_for_output(button_index, 1);
 
     this.then(function () {
-        this.test.assertEquals(this.get_output_cell(button_index, 1).data['text/plain'], "'Clicked'",
+        this.test.assertEquals(this.get_output_cell(button_index, 1).text, "WARNING: The widget API is still considered experimental and \n    may change by the next major release of IPython.\n",
+            'Importing widgets show a warning');
+        this.test.assertEquals(this.get_output_cell(button_index, 2).data['text/plain'], "'Clicked'",
             'Button click event fires.');
     });
-});
\ No newline at end of file
+});