Are tests a mandatory aspect of backend development?

Tests are not strictly mandatory in backend development, but they are highly desirable and considered good practice. Tests help:

• Ensure stability and correctness of the code.
• Quickly identify errors during changes.
• Simplify refactoring and maintenance.

Without tests, the risk of bugs is higher, especially in complex systems. In professional development, it is common to write unit tests, integration tests, and e2e tests to improve product quality.