Chapter 4. Building modular applications
"To define it rudely but not ineptly, engineering is the art of doing that well with one dollar, which any bungler can do with two after a fashion."
So far, we've looked at what it means for objects to be well behaved and classes to be well designed in the small. But in any real-world project, there's also a big picture to be considered. Just as there are principles that help our design of objects in the micro, there are principles for good design in the macro sense. In the coming sections, we'll talk about these design principles and see how to relate them to dependency injection.
Chief among these is testing. DI facilitates testing and testable code, the latter being an extremely important ...
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