MAGETWO-96599: Backorder customer notification is not shown in Magento 2.2.0 / 2.1.9 on One page checkout #11708

Author: yelahin-serhiy

app/code/Magento/Checkout/Test/Mftf/Test/StorefrontCustomerCheckoutTest.xml

@@ -76,6 +76,7 @@
 
         <amOnPage stepKey="s96" url="{{AdminCustomerPage.url}}"/>
         <waitForPageLoad stepKey="s97"/>
+        <waitForElementVisible selector="{{AdminCustomerFiltersSection.filtersButton}}" time="30" stepKey="waitFiltersButton"/>
         <click stepKey="s98" selector="{{AdminCustomerFiltersSection.filtersButton}}"/>
         <fillField stepKey="s99" selector="{{AdminCustomerFiltersSection.emailInput}}" userInput="$$simpleuscustomer.email$$"/>
         <click stepKey="s100" selector="{{AdminCustomerFiltersSection.apply}}"/>