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RailsConf 2019 - Fixing Flaky Tests Like a Detective by Sonja Peterson

Sonja Peterson
Senior Software Engineer at ActBlue Technical Services
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RailsConf 2019
May 1, 2019, Minneapolis, USA
RailsConf 2019
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Sonja Peterson
Senior Software Engineer at ActBlue Technical Services

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RailsConf 2019 - Fixing Flaky Tests Like a Detective by Sonja Peterson


Every test suite has them: a few tests that usually pass but sometimes mysteriously fail when run on the same code. Since they can’t be reliably replicated, they can be tough to fix. The good news is there’s a set of usual suspects that cause them: test order, async code, time, sorting and randomness. While walking through examples of each type, I’ll show you methods for identifying a culprit that range from capturing screenshots to traveling through time. You’ll leave with the skills to fix any flaky test fast, and with strategies for monitoring and improving your test suite's reliability overall.

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