testdouble/suture

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1409 stars · 29 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Suture is a Ruby gem that makes it safer to refactor or fully reimplement poorly-understood legacy code. It supports the whole refactor lifecycle by recording calls to a 'seam' and verifying that new implementations match the old behavior in development, staging, and production.

Use cases

• safely refactor legacy ruby code
• reimplement a code path without breaking behavior
• record and replay production calls to verify a rewrite
• characterization testing for untested code
• create seams around code I don't understand
• verify new implementation matches old one in production

When to choose

• you need to change or rewrite critical Ruby code with no tests
• you want recorded real-world inputs to validate a reimplementation
• you're doing incremental strangler-style refactors in Ruby

When to avoid

• your codebase is well-tested and easy to change directly
• you work outside Ruby
• you need active development or new features

Facets

library · maturity maintenance

testing developer-tools developer-tools programming-languages testing ruby jvm refactoring characterization-testing seam legacy-code verification-testing ruby-gem

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