Take control of your application's behavior and move toward dependency injection by refactoring your existing code.

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Refactoring plays a critical role in maintaining a codebase that allows for rapid development, but it’s important to not to view this, and code quality, as an isolated process.

Ondrej Balas continues his discussion on refactoring your code for dependency injection, this time focusing on the composition root pattern.

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From Sri Lanka comes an academic report saying you probably shouldn't even bother to refactor -- if code quality is your primary concern.

Change the code to use current code conventions (again using refactoring tools). Start to extract functionality into meaningful routines. Start to add tests where possible (not often possible).

At Ignite 2019, Microsoft shared that Visual Studio IntelliCode now has whole-line code completions and features dynamic refactoring detection.

When you're refactoring legacy code, it doesn't matter if some of the tests you write happen to contradict ideal specifications. What matters is that they test the program's current behavior.