The first step we've decided to take to ensure that behavior is maintained during refactoring is to write end-to-end tests. In other applications that include frontends, this could be using a higher-level tool, such as Selenium/Selenide.
In our case, as the frontend is not subject to refactoring, the tool can be lower-level. We have chosen to write HTTP requests for the purpose of end-to-end tests.
These requests should be automatic and testable, and should follow all existing rules for automatic tests or specifications. As we were discovering the real application behavior while writing these tests, we have decided to write a spike in a tool called Postman. The product website is here: https://www.getpostman.com/ ...
