ACP2E-711: "Invalid Form Key. Please refresh the page." error occurs when changing the product limit in categories

- Updated unit tests

Author: Mohan Ahuja

dev/tests/js/jasmine/tests/app/code/Magento/PageCache/frontend/js/form-key-provider.test.js

@@ -32,15 +32,31 @@ define([
             date.setTime(date.getTime() + 86400000);
             expires = '; expires=' + date.toUTCString();
             document.cookie = 'form_key=FAKE_COOKIE' + expires + '; path=/';
-            formKeyInit();
+            formKeyInit({'isPaginationCacheEnabled': 0});
             expect($(inputContainer).val()).toEqual('FAKE_COOKIE');
         });
 
         it('widget sets value to input[form_key] in case it empty', function () {
             document.cookie = 'form_key= ; expires = Thu, 01 Jan 1970 00:00:00 GMT';
-            formKeyInit();
+            formKeyInit({'isPaginationCacheEnabled': 0});
             expect($(inputContainer).val()).toEqual(jasmine.any(String));
             expect($(inputContainer).val().length).toEqual(16);
         });
+
+        it('widget gets value from input[form_key] in case cookie is empty is pagination cache enabled', function () {
+            document.cookie = 'form_key= ; expires = Thu, 01 Jan 1970 00:00:00 GMT';
+            var formKey = 'TestInputStrings';
+            $(inputContainer).val(formKey);
+            formKeyInit({'isPaginationCacheEnabled': 1});
+            expect($(inputContainer).val()).toEqual(jasmine.any(String));
+            expect($(inputContainer).val().length).toEqual(16);
+            expect(formKey).toEqual(getFormKeyCookie());
+        });
+
+        function getFormKeyCookie() {
+            var nameEQ = 'form_key=',
+                cookieArr = document.cookie.split(';');
+           return cookieArr[0].split(nameEQ)[1];
+        }
     });
 });