What exactly did you test?

During testing, I checked the functionality, performance, and security of the application. Specifically, I tested:

• Functional scenarios of the user interface and API.
• Integration between modules and external services.
• Error handling and edge cases.
• Load testing to evaluate performance.
• Regression testing after making changes.

For example, for the API, I wrote automated tests that checked the correctness of responses, compliance with JSON schemas, and handling of incorrect data.