Stubs
Stubs are simplified, placeholder implementations of software components used in testing to isolate the unit under test from its dependencies. They simulate the behavior of real objects by returning predefined, hard-coded responses to method calls, allowing developers to test code in a controlled environment without relying on external systems or complex logic. This technique is fundamental in unit testing to ensure code correctness and reliability.
Developers should use stubs when writing unit tests to isolate the code being tested from external dependencies like databases, APIs, or other modules, enabling faster and more predictable tests. They are particularly useful in scenarios where dependencies are slow, unreliable, or not yet implemented, such as in test-driven development (TDD) or when mocking complex interactions is unnecessary. Stubs help verify that the unit under test behaves correctly with specific inputs, without the overhead of full integration.