text: 
  // Test
  casper.notebook_test(function () {
      var a = 'print("a")';
      var index = this.append_cell(a);
      this.execute_cell_then(index);
  
      var b = 'print("b")';
      index = this.append_cell(b);
      this.execute_cell_then(index);
  
      var c = 'print("c")';
      index = this.append_cell(c);
      this.execute_cell_then(index);
  
      this.then(function () {
  
          // Up and down in command mode
          this.select_cell(3);
          this.trigger_keydown('j');
          this.validate_notebook_state('j at end of notebook', 'command', 3);
          this.trigger_keydown('down');
          this.validate_notebook_state('down at end of notebook', 'command', 3);
          this.trigger_keydown('up');
          this.validate_notebook_state('up', 'command', 2);
          this.select_cell(0);
          this.validate_notebook_state('select 0', 'command', 0);
          this.trigger_keydown('k');
          this.validate_notebook_state('k at top of notebook', 'command', 0);
          this.trigger_keydown('up');
          this.validate_notebook_state('up at top of notebook', 'command', 0);
          this.trigger_keydown('down');
          this.validate_notebook_state('down', 'command', 1);
  
          // Up and down in edit mode
          this.click_cell_editor(3);
          this.validate_notebook_state('click cell 3', 'edit', 3);
          this.trigger_keydown('down');
          this.validate_notebook_state('down at end of notebook', 'edit', 3);
          this.set_cell_editor_cursor(3, 0, 0);
          this.trigger_keydown('up');
          this.validate_notebook_state('up', 'edit', 2);
          this.click_cell_editor(0);
          this.validate_notebook_state('click 0', 'edit', 0);
          this.trigger_keydown('up');
          this.validate_notebook_state('up at top of notebook', 'edit', 0);
          this.set_cell_editor_cursor(0, 0, 10);
          this.trigger_keydown('down');
          this.validate_notebook_state('down', 'edit', 1);
      });
  });
  