ACQE-4139

Author: shanthi

app/code/Magento/Checkout/Test/Mftf/Section/CheckoutCartMessageSection.xml

@@ -13,5 +13,6 @@
         <element name="errorMessage" type="text" selector=".message-error.error.message>div" />
         <element name="emptyCartMessage" type="text" selector=".cart-empty>p"/>
         <element name="errorMessageText" type="text" selector="//div[contains(@class, 'message-error')]/div[text()='{{var}}']" parameterized="true"/>
+        <element name="backorderErrorMessage" type="text" selector=".//*[@class='cart item']//div[@class='cart item message notice']"/>
     </section>
 </sections>