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Using Logging Seams for Legacy Code Unit Testing
Using logging seams you can easily create unobtrusive unit tests around legacy classes, without needing to edit class logic as well as avoiding behavior changes.
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Dealing with Legacy Code
Here's a three-pronged attack to use on the legacy code that everyone eventually inherits: Build, Automate, Test. Use this BAT to create a safety net to ensure your code continues to work the way you want it to. Richardson shows how this helps quickly identify and eliminate unintended side effects. See how your day-to-day work compares, and see if you need to approach your work differently.