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flickr.com/photos/tomtolkien Mutation Testing with Mutant

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A carpenter is only as good as their tools. flickr.com/photos/matthigh

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What’s in your toolbox? flickr.com/photos/dk_spook

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Editor flickr.com/photos/audringje

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flickr.com/photos/laughingsquid Vim 1.0

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Debugger flickr.com/photos/86639298@N02

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Profiler flickr.com/photos/anndouglas

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Testing

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Testing flickr.com/photos/onepointfour

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Code has bugs Tests are code ∴ Tests have bugs flickr.com/photos/birdseyeview

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Code Coverage

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twitter.com/bloerwald/status/448415935926255618

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Mutation flickr.com/photos/tambako

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Original def foo(arg = true) arg || fail end assert_nothing_raised { foo }

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Mutant def foo(arg = true) arg end assert_nothing_raised { foo }

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twitter.com/kytrinyx/status/453567958317428736

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Demo