Below are some resources to help you test Logic Apps
Logic App Testing Framework
Shankar Chandrasekar has written a handy little utility which can help you test the logic apps by doing assertions against the execution of actions within the logic app.
More info is available here:
Getting url to Run Tests in Azure Devops
If your using the Logic App Test Framework then in Azure Devops you have a challenge about how to access the url to test your logic app when its deployed. This article from Merry He can help you do it.
Mocking Test Data
This article will help you use the Static Response feature of Logic Apps to help you test your logic apps. Nice job by Kent Weare:
Logic App Testing Video
In this old video on Integration Monday I talk about how you can use specflow and the telemetry published by Logic Apps to test them. Its probably better to use Shankar's approach above these days as its simpler but the principals in the video below are still sound.