MC-17003: Update Totals button is missing from Credit Memo page

Author: DianaRusin

app/code/Magento/Sales/Test/Mftf/Test/AdminCheckingCreditMemoUpdateTotalsTest.xml

@@ -20,20 +20,14 @@
             <group value="sales"/>
         </annotations>
         <before>
-            <!--Create category-->
-            <createData entity="_defaultCategory" stepKey="createCategory"/>
-            <!--Create simple product-->
-            <createData entity="_defaultProduct" stepKey="createSimpleProduct">
-                <requiredEntity createDataKey="createCategory"/>
-            </createData>
+            <!--Create product-->
+            <createData entity="SimpleProduct2" stepKey="createSimpleProduct"/>
             <!--Create customer-->
             <createData entity="Simple_US_CA_Customer" stepKey="createCustomer"/>
             <!--Login to admin page-->
             <actionGroup ref="LoginAsAdmin" stepKey="loginAsAdmin"/>
         </before>
         <after>
-            <!--Delete category-->
-            <deleteData createDataKey="createCategory" stepKey="deleteCategory"/>
             <!--Delete simple product-->
             <deleteData createDataKey="createSimpleProduct" stepKey="deleteSimpleProduct"/>
             <!--Delete customer-->

dev/tests/functional/tests/app/Magento/Sales/Test/Block/Adminhtml/Order/Creditmemo/Totals.php

@@ -32,21 +32,21 @@ class Totals extends \Magento\Sales\Test\Block\Adminhtml\Order\Totals
      *
      * @var string
      */
-    private $refundShippingSelector = '//input[@id=\'shipping_amount\']';
+    private $refundShippingSelector = '#shipping_amount';
 
     /**
      * Adjustment Refund css selector.
      *
      * @var string
      */
-    private $adjustmentRefundSelector = '//input[@id=\'adjustment_positive\']';
+    private $adjustmentRefundSelector = '#adjustment_positive';
 
     /**
      * Adjustment Fee css selector.
      *
      * @var string
      */
-    private $adjustmentFeeSelector = '//input[@id=\'adjustment_negative\']';
+    private $adjustmentFeeSelector = '#adjustment_negative';
 
     /**
      * 'Update Totals button css selector.

dev/tests/functional/tests/app/Magento/Sales/Test/TestStep/CreateCreditMemoStep.php

@@ -127,7 +127,7 @@ protected function getCreditMemoIds()
      * @param array $data
      * @return int
      */
-    private function compareRefundTotalsData($data)
+    private function compareRefundTotalsData($data): int
     {
         $compareData = [
             'shipping_amount' =>