Fixed JS tests to reflect Jason's changes

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

@@ -10,9 +10,10 b' casper.notebook_test(function () {'
     var multicontainer1_query = '.widget-area .widget-subarea div div.nav-tabs';
     var multicontainer1_index = this.append_cell(
         'multicontainer = widgets.MulticontainerWidget()\n' +
-        'page1 = widgets.StringWidget(parent=multicontainer)\n' +
-        'page2 = widgets.StringWidget(parent=multicontainer)\n' +
-        'page3 = widgets.StringWidget(parent=multicontainer)\n' +
+        'page1 = widgets.StringWidget()\n' +
+        'page2 = widgets.StringWidget()\n' +
+        'page3 = widgets.StringWidget()\n' +
+        'multicontainer.children = [page1, page2, page3]\n' +
         'display(multicontainer)\n' +
         'multicontainer.selected_index = 0\n' +
         'print("Success")\n');
@@ -64,9 +65,10 b' casper.notebook_test(function () {'
     var multicontainer2_query = '.widget-area .widget-subarea .accordion';
     var multicontainer2_index = this.append_cell(
         'multicontainer = widgets.MulticontainerWidget()\n' +
-        'page1 = widgets.StringWidget(parent=multicontainer)\n' +
-        'page2 = widgets.StringWidget(parent=multicontainer)\n' +
-        'page3 = widgets.StringWidget(parent=multicontainer)\n' +
+        'page1 = widgets.StringWidget()\n' +
+        'page2 = widgets.StringWidget()\n' +
+        'page3 = widgets.StringWidget()\n' +
+        'multicontainer.children = [page1, page2, page3]\n' +
         'multicontainer.set_title(2, "good")\n' +
         'display(multicontainer, view_name="AccordionView")\n' +
         'multicontainer.selected_index = 0\n' +

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

@@ -8,7 +8,8 b' casper.notebook_test(function () {'
 
     var container_index = this.append_cell(
         'container = widgets.ContainerWidget()\n' +
-        'button = widgets.ButtonWidget(parent=container)\n'+
+        'button = widgets.ButtonWidget()\n'+
+        'container.children = [button]\n'+
         'display(container)\n'+
         'container.add_class("my-test-class")\n'+
         'print("Success")\n');
@@ -35,15 +36,15 b' casper.notebook_test(function () {'
     });
 
     index = this.append_cell(
-        'container.set_css("display", "none")\n'+
+        'container.set_css("float", "right")\n'+
         'print("Success")\n');
     this.execute_cell_then(index, function(index){
 
         this.test.assert(this.get_output_cell(index).text == 'Success\n', 
             'Set container class CSS cell executed with correct output.');
-
+        
         this.test.assert(this.cell_element_function(container_index, 
-            '.widget-area .widget-subarea .my-test-class', 'css', ['display'])=='none',
+            '.widget-area .widget-subarea .my-test-class', 'css', ['float'])=='right',
             'set_css works.');
     });