This article demonstrates safe modification of a legacy business app using characterization testing and refactoring strategies.
To safely modify a business application with no tests, this article explains, with C# examples, the procedure for a characterization test (the golden master method) that pins down current behavior, how to create seams, and the operational rules for keeping refactoring and feature work separate. Archived version of https://comcomponent.com/en/blog/characterization-test-legacy-refactoring/, as published on 2026-07-27. The live article is maintained and may change after this date. First published 2026-07-17.
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Go Komura (2026) studied this question.
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