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Usually some sort of abstract language or pictures are used to express the software design. 3. Please use ide.geeksforgeeks.org, generate link and share the link here. The definitive article on dependency injection is "Inversion of Control Containers and the Dependency Injection Pattern," by Martin Fowler. Logic is easy to unit test if it is stateless and side-effect free. If it is code that may be restored, make a ticket and reference the commit hash for the code delete. A good maximum module size is about 500 lines. The more code you have to instantiate and put in place to be able to test a specific piece of behavior, the worse your code is. For example, person, banks, company and customers are treated as objects.