Testable Code - Brown Field vs Green Field | Unit Tests

How testable is a code base. A common term or phrase is Brown field vs Green field. Brown field is typically a legacy system of older code that might not have been written with the best coding practices. It might be much harder to test.

On the other hand, Green field is when a code base is completely new and or is being developed from scratch. This would be a good opportunity to apply all the best practices to make the code much more testable

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