text: /* global internals */
  
  var $ = require('jquery');
  
  QUnit.module('Regression');
  
  QUnit.test('Widget should work right if item is class instance', function(assert) {
      var User = function(name) { this.name = name; };
      var treeView = $('#treeView').dxTreeView({
          items: [
              new User('Alex'),
              new User('Jack'),
              new User('John')
          ],
          displayExpr: 'name'
      }).dxTreeView('instance');
  
      assert.equal(treeView.$element().find('.dx-item span').eq(0).text(), 'Alex');
      assert.equal(treeView.$element().find('.dx-item span').eq(1).text(), 'Jack');
      assert.equal(treeView.$element().find('.dx-item span').eq(2).text(), 'John');
  });
  
  QUnit.test('\'No data\' text should be rendered if tree view has no items', function(assert) {
      var treeView = $('#treeView').dxTreeView({
          items: []
      }).dxTreeView('instance');
  
      assert.ok(treeView.$element().hasClass('dx-empty-collection'));
      assert.equal(treeView.$element().find('.dx-empty-message').length, 1);
  
      treeView.option('items', [{ text: 'Item 1' }]);
      assert.ok(!treeView.$element().hasClass('dx-empty-collection'));
      assert.equal(treeView.$element().find('.dx-empty-message').length, 0);
  
      treeView.option('items', []);
      assert.ok(treeView.$element().hasClass('dx-empty-collection'));
      assert.equal(treeView.$element().find('.dx-empty-message').length, 1);
  });
  
  QUnit.test('T217916: dxTreeView does not render a node if ID is less than ParentID', function(assert) {
      var treeView = $('#treeView').dxTreeView({
          items: [
              { id: 1, text: 'Cats', parentId: 0, expanded: true },
              { id: 4, text: 'Sub Bob', parentId: 2, expanded: true },
              { id: 2, text: 'Bob', parentId: 3, expanded: true },
              { id: 3, text: 'Dogs', parentId: 0, expanded: true }
          ],
          dataStructure: 'plain'
  
      }).dxTreeView('instance');
  
      assert.equal(treeView.$element().find('.' + internals.ITEM_CLASS).length, 4);
  });
  