Fixing JS tests.

IPython/html/tests/casperjs/test_cases/nb_arrow_keys.js

@@ -1,23 +1,24 b''
 //
 // Check for errors with up and down arrow presses in a non-empty notebook.
 //
 casper.notebook_test(function () {
     var result = this.evaluate(function() {
+        IPython.notebook.command_mode();
         pos0 = IPython.notebook.get_selected_index();
-        IPython.notebook.insert_cell_below('code'); 
+        IPython.utils.press(IPython.keycodes.b)
         pos1 = IPython.notebook.get_selected_index();
-        IPython.notebook.insert_cell_below('code'); 
+        IPython.utils.press(IPython.keycodes.b)
         pos2 = IPython.notebook.get_selected_index();
         // Simulate the "up arrow" and "down arrow" keys.
         IPython.utils.press_up();
         pos3 = IPython.notebook.get_selected_index();
         IPython.utils.press_down();
         pos4 = IPython.notebook.get_selected_index();
         return  pos0 == 0 &&
                 pos1 == 1 &&
                 pos2 == 2 &&
                 pos3 == 1 &&
                 pos4 == 2;
     });
     this.test.assertTrue(result, 'Up/down arrow okay in non-empty notebook.');
 });