MC-37103: Create automated test for "Create order from customer page, free"

Author: mykhailomatiola

app/code/Magento/Sales/Test/Mftf/ActionGroup/AssertAdminFreePaymentActionGroup.xml

@@ -0,0 +1,17 @@
+<?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="AssertAdminFreePaymentActionGroup">
+        <annotations>
+            <description>Checks the free payment on the Admin Create Order page.</description>
+        </annotations>
+        <click selector="{{AdminOrderFormPaymentSection.linkPaymentOptions}}" stepKey="clickPaymentMethods"/>
+        <see selector="{{AdminOrderFormPaymentSection.freePaymentLabel}}" userInput="No Payment Information Required" stepKey="checkFreeShipping"/>
+    </actionGroup>
+</actionGroups>

app/code/Magento/Sales/Test/Mftf/Section/AdminOrderFormPaymentSection.xml

@@ -28,5 +28,6 @@
         <element name="cashOnDeliveryOption" type="radio" selector="#p_method_cashondelivery" timeout="30"/>
         <element name="purchaseOrderOption" type="radio" selector="#p_method_purchaseorder" timeout="30"/>
         <element name="purchaseOrderNumber" type="input" selector="#po_number"/>
+        <element name="freePaymentLabel" type="text" selector="#order-billing_method_form label[for='p_method_free']"/>
     </section>
 </sections>