mbj/mutant
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Mutation testing for Ruby. AI writes your code. AI writes your tests. But who tests the tests?
7 mentions on Hacker News by 7 people: 2 stories, 5 comments · first 2014-05-22 · latest 2025-10-06
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Automated code reviews via mutation testingstory by mooreds · 2025-10-06 · 10 comments
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There's a pretty good Ruby gem I've used for this before: https://github.com/mbj/mutant
comment by technion · 2022-07-18 · in An ex-Googler's guide to dev tools (2020) -
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Mutant – Automated code reviews via mutation testing – semantic code coveragestory by thunderbong · 2021-09-09 · 1 comment
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Ruby, too: https://github.com/mbj/mutant I think most languages have something like this now.
comment by r-s · 2018-11-13 · in Things nobody told me about being a software engineer -
If you're working with ruby mutant is pretty good -> https://github.com/mbj/mutant
comment by 0hjc · 2015-05-06 · in Java Mutation Testing -
…tested is mutated, in order to identify unspecified behavior? Mutant is a Ruby library for this: https://github.com/mbj/mutant
comment by lgierth · 2015-03-30 · in Hypothesis 1.0: A property-based testing library for Python -
In the ruby world there is the "mutant" ( https://github.com/mbj/mutant ) gem that does stuff like this automatically. It runs your tests and makes sure they all pass then it mutates the code under test (changing a == b to a != b or a <=…
comment by rurounijones · 2014-05-22 · in C-Reduce, a C program reducer