Unverified50% confidenceFactExact time
Michael Feathers proposed the concept of a seam: without modifying the code itself, one introduces test points (such as wrapper functions, dependency injection points, link-time substitution) to isolate the logic to be changed, thereby obtaining a verifiable boundary for changes in a legacy system that lacks complete tests.
1
Sources
50%
Confidence
Long-term
Relevance
10/16/2026
First Seen
Sources
Cleaning Up Legacy Code: When Thread Communication Becomes a Monologue
youtubeAndroid Developers10/16/2026
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