magento-engcom/magento2ce#4283: Fixed test

Author: Stanislav Idolov

app/code/Magento/Store/Test/Mftf/Test/StorefrontAddStoreCodeInUrlTest.xml

@@ -28,6 +28,9 @@
         </before>
         <after>
             <magentoCLI command="config:set {{StorefrontDisableAddStoreCodeToUrls.path}} {{StorefrontDisableAddStoreCodeToUrls.value}}" stepKey="addStoreCodeToUrlDisable"/>
+            <actionGroup ref="CliCacheFlushActionGroup" stepKey="flushPageCacheAfter">
+                <argument name="tags" value="full_page"/>
+            </actionGroup>
         </after>
 
         <actionGroup ref="StorefrontClickOnHeaderLogoActionGroup" stepKey="clickOnStorefrontHeaderLogo"/>