fix

Author: Manjusha.S

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

@@ -20,6 +20,7 @@
             <group value="Sales"/>
         </annotations>
         <before>
+            <magentoCLI command="config:set {{EnableFlatRateConfigData.path}} {{EnableFlatRateConfigData.value}}" stepKey="enableFlatRate"/>
             <createData entity="_defaultCategory" stepKey="createSimpleCategory"/>
             <createData entity="SimpleProduct" stepKey="createSimpleProduct">
                 <requiredEntity createDataKey="createSimpleCategory"/>