It is passive; it waits to be called and returns hardcoded or predefined data. Example Scenario:
In software testing, and drivers are "mock" components used as temporary replacements for modules that are not yet developed or available. They are essential for incremental integration testing , allowing you to test specific parts of a system in isolation. 1. Stubs (The "Called" Program)
A stub is a dummy module that simulates a . It is used when the main module is ready for testing, but the sub-modules it depends on are still being built.
A driver is a temporary piece of code that simulates a . It "drives" the module under test by providing inputs and initiating execution. Difference between Stubs and Drivers - GeeksforGeeks