Add slimerjs flag to test engine.

IPython/html/tests/notebook/dualmode.js

@@ -15,11 +15,13 b' casper.notebook_test(function () {'
     this.execute_cell_then(index);
 
     this.then(function () {
-        // When running in xvfb, the Slimer window doesn't always have focus
-        // immediately.  By clicking on a new element on the page we ccan force
-        // it to gain focus.
-        this.click_cell_editor(1);
-        this.click_cell_editor(0);
+        if (this.slimerjs) {
+            // When running in xvfb, the Slimer window doesn't always have focus
+            // immediately.  By clicking on a new element on the page we ccan force
+            // it to gain focus.
+            this.click_cell_editor(1);
+            this.click_cell_editor(0);
+        }
 
         this.validate_notebook_state('initial state', 'edit', 0);
         this.trigger_keydown('esc');

IPython/html/tests/util.js

@@ -453,18 +453,15 b' casper.assert_colors_equal = function (hex_color, local_color, msg) {'
 
 casper.notebook_test = function(test) {
     // Wrap a notebook test to reduce boilerplate.
-    //
-    // If you want to read parameters from the commandline, use the following
-    // (i.e. value=):
-    // if (casper.cli.options.value) {
-    //     casper.exit(1);
-    // }
     this.open_new_notebook();
 
     // Echo whether or not we are running this test using SlimerJS
     if (this.evaluate(function(){
         return typeof InstallTrigger !== 'undefined';   // Firefox 1.0+
-    })) { console.log('This test is running in SlimerJS.'); }
+    })) { 
+        console.log('This test is running in SlimerJS.'); 
+        this.slimerjs = true;
+    }
     
     // Make sure to remove the onbeforeunload callback.  This callback is 
     // responsable for the "Are you sure you want to quit?" type messages.