Is there anyway to off-line test Logic App functions?

Is there anyway to off-line test Logic App functions?

e.g. if I have something like ...

"expression": "@equals(
   coalesce(triggerBody()?['Correlation']?['CaseNumber'], 'CaseNumberMissing'), 
   'CaseNumberMissing')",

Ok, I can deploy the Logic App to Azure, use Postman to send in a suitable request, and then check in the Portal ...

But this is so slow :-(