Sorbet + 100% cov makes Ruby refactoring possible

• 28/04/2022
• 869

If you’d asked me five years ago how to safely deploy a change of this size in Ruby, I’d have a very simple answer: you can’t.

Ruby’s parser is no help in detecting regressions – it’ll notice invalid syntax, and that’s about it. A good test suite helps, but it’s never complete enough – the happy path and a few error cases are tested, but in production all kinds of alternate data tends to be flowing through. A similar story for staging environments – activity there isn’t of high enough fidelity to catch problems. Even a test suite with 100% line coverage (a rare thing anyway) is no sure fire bet because even covered lines may still have alternate branches which aren’t.

• Sorbet
• Ruby
• refactoring
• possible

Nezir Zahirovic

Contractor Ruby On Rails (8+ years) / MCPD .Net / C# / Asp.Net / CSS / SQL / (11 years)

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