 keeps previous value of ' + property, function() {
            var dialog = fixture('basic');
            // Changed before modal is true.
            dialog[property] = true;
            // Toggle twice to trigger observer.
            dialog.modal = true;
            dialog.modal = false;
            assert.isTrue(dialog[property], property + ' is still true');
          });

          test('default modal does not override ' + property +' (attribute)', function() {
            // Property is set on ready