Test improvements:

 - test stabilization

Author: okolesnyk

app/code/Magento/Backend/Test/Mftf/ActionGroup/AdminClickDeleteMainButtonWithConfirmationActionGroup.xml

@@ -10,6 +10,5 @@
           xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
     <section name="AdminGridTableSection">
         <element name="row" type="text" selector="table.data-grid tbody tr[data-role=row]:nth-of-type({{row}})" parameterized="true"/>
-        <element name="rowByValue" type="text" selector="//table[@class='data-grid']//tbody//tr[@data-role='row'] //td[contains(., '{{var}}')]" parameterized="true" timeout="30"/>
     </section>
 </sections>

app/code/Magento/Backend/Test/Mftf/Section/AdminGridTableSection.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ /**
+  * Copyright © Magento, Inc. All rights reserved.
+  * See COPYING.txt for license details.
+  */
+-->
+
+<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
+    <actionGroup name="StorefrontAddSimpleProductToShoppingCartActionGroup">
+        <arguments>
+            <argument name="product"/>
+            <argument name="qty" type="string" defaultValue="1" />
+        </arguments>
+        <amOnPage url="{{StorefrontProductPage.url(product.custom_attributes[url_key])}}" stepKey="openProductPage" />
+        <waitForPageLoad stepKey="waitForProductPageOpen" />
+        <fillField userInput="{{qty}}" selector="{{StorefrontProductInfoMainSection.qty}}" stepKey="fillQty" />
+        <click selector="{{StorefrontProductInfoMainSection.AddToCart}}" stepKey="clickAddToCart" />
+        <waitForElementVisible selector="{{StorefrontMessagesSection.messageByType('success')}}" stepKey="waitForSuccessMessage" />
+    </actionGroup>
+</actionGroups>

app/code/Magento/Checkout/Test/Mftf/ActionGroup/StorefrontAddSimpleProductToShopingCartActionGroup.xml

@@ -13,5 +13,6 @@
                  selector="//main//div[contains(@class, 'messages')]//div[contains(@class, 'message')]/div[contains(text(), '{{var1}}')]"
                  parameterized="true"
         />
+        <element name="messageByType" type="text" selector="[data-ui-id='message-{{messageType}}']" parameterized="true" />
     </section>
 </sections>