Do you use mocks or stubs for testing components in your projects?

Yes, mocks and stubs are often used in projects for component testing. This allows isolating the tested module from external dependencies and checking its behavior in controlled conditions.

Mocks are objects that imitate the behavior of real components and allow setting expected calls and responses. They are useful for verifying interactions between components.

Stubs are simpler replacements that return fixed data without complex logic.

For example, when testing a service that accesses a database, the real access can be replaced with a mock object that returns pre-prepared data. This speeds up tests and makes them more reliable.

Using mocks helps to:

• Isolate the code under test.
• Check error handling and edge cases.
• Increase test execution speed.

In test automation, specialized libraries for creating mocks are often used, such as Mockito for Java or unittest.mock for Python.