Do you know what tests developers write themselves?

Developers typically write the following types of tests:

• Unit tests — verify individual functions or methods for correctness with various input data.
• Integration tests — check the interaction between modules or with external systems (e.g., databases).
• Functional tests — test business logic and usage scenarios.
• Error handling tests — verify correct reactions to exceptions and incorrect data.

The goal is to cover key parts of the code, quickly identify regressions, and maintain product quality. Test automation helps accelerate the development cycle and improve stability.