Automating API Testing with GitHub Copilot – A Developer’s Experiment

Writing API tests is necessary, but let’s be honest—it’s not the most exciting part of development. Setting up xUnit, Moq, and dependency mocks takes time, and sometimes, it feels like more effort than writing the actual API itself.

Recently, I decided to experiment with GitHub Copilot’s "Ask Copilot" feature for API test generation. Instead of manually writing test cases, I let Copilot handle it. The results?

✔️ Structured xUnit tests with clear assertions
✔️ Automated Moq-based dependency mocking
✔️ Basic positive and negative test coverage

It wasn’t perfect—some test cases needed tweaking, and Copilot occasionally missed edge cases. But overall, the time saved was impressive. It felt like having an extra pair of hands that could handle the tedious setup while I focused on refining the logic.

If you're curious about how to use "Ask Copilot" to automate your API testing, I wrote a detailed breakdown of the process, including step-by-step instructions and real examples:

Have you tried using AI for unit testing? Do you trust Copilot for automated test writing, or do you prefer manual tests? Let’s discuss in the comments!