What are the advantages and disadvantages of modular tests?

Advantages of unit tests:

• Allow quick detection of errors in individual code components.
• Facilitate refactoring, as tests verify the correctness of modules.
• Improve code quality and documentation by demonstrating how a module should work.
• Automate the testing process, saving time during repeated checks.

Disadvantages of unit tests:

• Do not cover integration errors between modules.
• May require significant effort to write and maintain in large projects.
• Sometimes difficult to test dependencies and external resources (e.g., databases).
• Poorly written tests can create a false sense of security.

In conclusion, unit tests are an important tool, but they should be combined with integration and system tests.