Design
Principles of Object-Oriented Design Single Responsibility Principle (SRP) The SRP requires that a class should have only a single responsibility. Open-Closed Principle (OCP) The OCP requires that each software entity should be open for extension, but closed for modification. Liskov Substitution Principle (LSP) The LSP requires that objects in a program should be replaceable with instances of their subclasses without altering the correctness of that program. Interface Segregation Principle (ISP) The ISP requires that clients should not be forced to depend on interfaces that they do not use. Dependency Inversion Principle (DIP) The DIP requires that high-level modules should not depend on low-level modules, both should depend on abstraction. Also, abstraction should not depend on details, details should depend on abstractions. Test-driven development (TDD) Test-driven development (TDD) is a software development process relying on software requirements being converted to test cases