Object-oriented design and practice to learn by test-driven developmentb A guide to more robust object-oriented development with TDD bWhile demonstrating how TDD works on different layers of software development, you can configure your code to be object- We present a method to explain the relationship between objects by object. This suggests a guide that systematically solves the problem that a team using TDD will encounter in a real development project. How to effectively implement TDD, how to make cleaner and maintainable code, how to maintain sustainable quality through testing, how to use TDD, object and object-oriented design together in real development projects, Oriented design guide, and solving the difficulties encountered during TDD.