API testing and test data - how to be?

Question

API

In order to test a "combat" system, it is logical to send requests to it and check whether it works or not. Even more logical is to do it automatically.
But what about those test demo data that will be uploaded to the servers? How, for example, to test the API of a system that has add/{id} but no delete/{id}?
If the error is methodological somewhere, please indicate where exactly?

Answer 1

1. Request the implementation of delete
2. Request a replica of the combat system for testing with the ability to completely reset user data on request