update selection test with null selection being invalid

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

@@ -1,135 +1,135 b''
 // Test selection class
 casper.notebook_test(function () {
     index = this.append_cell(
         'from IPython.html import widgets\n' + 
         'from IPython.display import display, clear_output\n' +
         'print("Success")');
     this.execute_cell_then(index);
 
     var combo_selector = '.widget-area .widget-subarea .widget-hbox-single .btn-group .widget-combo-btn';
     var multibtn_selector = '.widget-area .widget-subarea .widget-hbox-single .btn-group[data-toggle="buttons-radio"]';
     var radio_selector = '.widget-area .widget-subarea .widget-hbox .vbox';
     var list_selector = '.widget-area .widget-subarea .widget-hbox .widget-listbox';
 
     var selection_index;
     var selection_values = 'abcd';
     var check_state = function(context, index, state){
         if (0 <= index && index < selection_values.length) {
             var multibtn_state = context.cell_element_function(selection_index, multibtn_selector + ' .btn:nth-child(' + (index + 1) + ')', 'hasClass', ['active']);
             var radio_state = context.cell_element_function(selection_index, radio_selector + ' .radio:nth-child(' + (index + 1) + ') input', 'prop', ['checked']);
             var list_val = context.cell_element_function(selection_index, list_selector, 'val');
             var combo_val = context.cell_element_function(selection_index, combo_selector, 'html');
             
             var val = selection_values.charAt(index);
             var list_state = (val == list_val);
             var combo_state = (val == combo_val);
 
             return multibtn_state == state &&
                 radio_state == state &&
                 list_state == state &&
                 combo_state == state;
         }
         return true;
     };
 
     var verify_selection = function(context, index){
         for (var i = 0; i < selection_values.length; i++) {
             if (!check_state(context, i, i==index)) {
                 return false;
             }
         }
         return true;
     };
 
 //values=["' + selection_values + '"[i] for i in range(4)]
     selection_index = this.append_cell(
         'values=["' + selection_values + '"[i] for i in range(4)]\n' +
         'selection = [widgets.DropdownWidget(values=values),\n' +
         '    widgets.ToggleButtonsWidget(values=values),\n' +
         '    widgets.RadioButtonsWidget(values=values),\n' +
         '    widgets.SelectWidget(values=values)]\n' +
         '[display(selection[i]) for i in range(4)]\n' +
         'for widget in selection:\n' +
         '    def handle_change(name,old,new):\n' +
         '        for other_widget in selection:\n' +
         '            other_widget.value = new\n' +
         '    widget.on_trait_change(handle_change, "value")\n' +
         'print("Success")\n');
     this.execute_cell_then(selection_index, function(index){
         this.test.assertEquals(this.get_output_cell(index).text, 'Success\n', 
             'Create selection cell executed with correct output.');
 
         this.test.assert(this.cell_element_exists(index, 
             '.widget-area .widget-subarea'),
             'Widget subarea exists.');
 
         this.test.assert(this.cell_element_exists(index, combo_selector),
              'Widget combobox exists.');
 
         this.test.assert(this.cell_element_exists(index, multibtn_selector),
             'Widget multibutton exists.');
 
         this.test.assert(this.cell_element_exists(index, radio_selector),
             'Widget radio buttons exists.');
 
         this.test.assert(this.cell_element_exists(index, list_selector),
             'Widget list exists.');
 
         // Verify that no items are selected.
-        this.test.assert(verify_selection(this, -1), 'No items selected.');
+        this.test.assert(verify_selection(this, 0), 'Default first item selected.');
     });
 
     index = this.append_cell(
         'for widget in selection:\n' +
         '    widget.value = "a"\n' +
         'print("Success")\n');
     this.execute_cell_then(index, function(index){
         this.test.assertEquals(this.get_output_cell(index).text, 'Success\n', 
             'Python select item executed with correct output.');
 
         // Verify that the first item is selected.
         this.test.assert(verify_selection(this, 0), 'Python selected');
 
         // Verify that selecting a radio button updates all of the others.
         this.cell_element_function(selection_index, radio_selector + ' .radio:nth-child(2) input', 'click');
     });
     this.wait(500);
     this.then(function () {
         this.test.assert(verify_selection(this, 1), 'Radio button selection updated view states correctly.');
 
         // Verify that selecting a list option updates all of the others.
         this.cell_element_function(selection_index, list_selector + ' option:nth-child(3)', 'click');
     });
     this.wait(500);
     this.then(function () {
         this.test.assert(verify_selection(this, 2), 'List selection updated view states correctly.');
 
         // Verify that selecting a multibutton option updates all of the others.
         this.cell_element_function(selection_index, multibtn_selector + ' .btn:nth-child(4)', 'click');
     });
     this.wait(500);
     this.then(function () {
         this.test.assert(verify_selection(this, 3), 'Multibutton selection updated view states correctly.');
 
         // Verify that selecting a combobox option updates all of the others.
         this.cell_element_function(selection_index, '.widget-area .widget-subarea .widget-hbox-single .btn-group ul.dropdown-menu li:nth-child(3) a', 'click');
     });
     this.wait(500);
     this.then(function () {
         this.test.assert(verify_selection(this, 2), 'Combobox selection updated view states correctly.');
     });
 
     this.wait(500); // Wait for change to execute in kernel
 
     index = this.append_cell(
         'for widget in selection:\n' +
         '    d = widget.values.copy()\n' +
         '    d["z"] = "z"\n' +
         '    widget.values = d\n' +
         'selection[0].value = "z"');
     this.execute_cell_then(index, function(index){
 
         // Verify that selecting a combobox option updates all of the others.
         this.test.assert(verify_selection(this, 4), 'Item added to selection widget.');
     });
 });
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