Should automatic tests be written for each element of the project?

Writing automated tests for every element of a project is not always practical. It is important to focus on:

• Criticality of functionality: key and complex parts of the code should be covered by tests.
• Support costs: very small or frequently changing parts can create unnecessary testing support burden.
• Type of tests: unit tests cover individual methods and classes, integration tests cover component interactions.

It is better to apply a testing strategy that balances coverage and costs. For example, cover business logic, important algorithms, and interfaces with tests, while writing tests for simple getters/setters is not necessary.

Thus, automated tests should be written for significant and stable parts of the project to ensure quality and facilitate maintenance.