12-4. Refactoring
Refactoring, the controlled technique for improving the design of an existing code base, can be applied safely only when you have a test suite. Otherwise, you might not notice the system breaking while you are carrying out the restructuring. Refactoring can be broken down into a series of small behavior-preserving transformations.
The following conditions will help you to improve the code and design of your project, while using unit tests to verify that the refactoring's transformation steps are, indeed, behavior- preserving and do not introduce errors:
All unit tests run correctly. The code communicates its design principles. The code contains no redundancies. The code contains the minimal number of classes and methods.
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