How does dependency injection contribute to easier unit testing?
Software development is a complex field that often involves managing the interdependencies between different parts of an application. One technique to handle such complexity is dependency injection (DI), which is a design pattern used to implement inversion of control for resolving dependencies. In simpler terms, DI allows you to inject objects that an object needs (its dependencies) rather than having it construct them directly. This is akin to giving a chef ingredients from an external source rather than having the chef grow them. This approach decouples the usage of an object from its creation, making it a powerful tool in a developer's toolkit, particularly when it comes to unit testing.