How does the separation of responsibilities in Clean Architecture facilitate the simplification of the testing process?

Responsibility separation in Clean Architecture divides the application into layers (e.g., Presentation, Domain, Data), each responsible for its part of the logic. This simplifies testing for several reasons:

• Logic isolation: Business logic (Use Cases) is separated from UI and infrastructure, allowing it to be tested without dependency on the Android framework.
• Ease of mocking: Dependencies between layers are expressed through interfaces, which simplifies replacing real components with stubs or mocks.
• Reusability: Business rules can be tested independently of specific UI or database implementations.

For example, you can write a unit test for a Use Case without launching the UI or accessing a real database, which speeds up and simplifies the testing process.