Скачать или смотреть Much Easier to Test SOLID Principles Code

The quickest win in having testable code is to have methods or classes that apply SOLID principles. The easiest of the principles is the Single Responsibility.

A key concept in writing maintainable software is testability. Code that's easy to test is typically the result of thoughtful design and adherence to best practices—one of the most widely recommended being the SOLID principles.

Among these principles, the Single Responsibility Principle (SRP) stands out as especially important when it comes to testability. The idea is simple: a class or method should have only one reason to change, meaning it should do one thing and do it well.

For example, when you write a method, it should be focused and concise. The goal isn’t just to make it small for testing’s sake, but to ensure that its purpose is clear, its behavior is predictable, and its outcome is well-defined. This clarity naturally makes the code easier to test, understand, and maintain.

By intentionally designing code this way, you create software that’s both robust and adaptable—qualities that become increasingly valuable as your codebase grows.