This project demonstrates a clean, maintainable order processing system that adheres to SOLID design principles. The system handles order calculations, order processing, invoice generation, and email ...

Imagine this is code you inherited from a legacy code-base. You want to write unit tests for them, and that is harder than it needs to be. By solving these problems you can learn more about the SOLID ...

The interface segregation principle (ISP), one of the five SOLID principles of object-oriented design, states that no client should be forced to depend on methods it does not use. When developers ...