Ask HN: Implement API Testing on Legacy Codebases

Hey folks,

I've recently been tasked with doing some code cleanup for a hefty .Net codebase. It quickly became apparent that this wasn't going to be possible without some sanity checks to make sure that my refactors didn't introduce any regressions.

I've been writing mini functional tests for each Swagger API endpoint using a custom Python script and some .json files. Ideally though, this feels like something that should be formalized and automated.*

Got any suggestions for a tool or approach?

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*For context, the way this is currently done by other devs is opening up the Swagger web interface, manually entering some data, and checking the response.