Initialize toolbar.js once

Author: ptylek

app/code/Magento/Catalog/view/frontend/web/js/product/list/toolbar.js

@@ -30,15 +30,20 @@ define([
             limitDefault: '9',
             url: '',
             formKey: '',
-            post: false
+            post: false,
+            isToolbarInitialized: false
         },
 
         /** @inheritdoc */
         _create: function () {
+            if (this.options.isToolbarInitialized) {
+                return;
+            }
             this._bind($(this.options.modeControl), this.options.mode, this.options.modeDefault);
             this._bind($(this.options.directionControl), this.options.direction, this.options.directionDefault);
             this._bind($(this.options.orderControl), this.options.order, this.options.orderDefault);
             this._bind($(this.options.limitControl), this.options.limit, this.options.limitDefault);
+            this.options.isToolbarInitialized = true;
         },
 
         /** @inheritdoc */

dev/tests/js/jasmine/tests/app/code/Magento/Catalog/frontend/js/product/list/toolbar.test.js

@@ -0,0 +1,33 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+define([
+    'jquery',
+    'Magento_Catalog/js/product/list/toolbar'
+], function ($, productListToolbarForm) {
+    'use strict';
+
+    describe('Magento_Catalog/js/product/list/toolbar', function () {
+        var widget,
+            wdContainer;
+
+        beforeEach(function () {
+            wdContainer = $('<div class="toolbar toolbar-products"></div>');
+            widget = wdContainer.productListToolbarForm();
+        });
+
+        afterEach(function () {
+            $(wdContainer).remove();
+        });
+
+        it('Widget extends jQuery object', function () {
+            expect($.fn.productListToolbarForm).toBeDefined();
+        });
+
+        it('Toolbar is initialized', function () {
+            expect(wdContainer.productListToolbarForm('option', 'isToolbarInitialized')).not.toBe(false);
+        });
+    });
+});