Episode 62
062: elm-test v2 with Martin Janiczek
Martin Janiczek joins us to talk about fuzz testing, why it matters, and how the upcoming elm-test v2 changes the way you write fuzzers in Elm.
August 1, 20221h 23m
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Show Notes
- Martin Janiczek (github) (twitter) (youtube)
elm-testepisode- Fuzzing is also known as Property-Based Testing
- Parameterized tests
- Martin's pure Elm text editor includes some fuzz tests
- Martin's pull request for the elm-test v2 changes
- Integrated shrinking vs the value-based (AKA type-based) approach
Fuzz.andThenandFuzz.filter(existed in 0.18 but were removed because they didn't shrink well)- elm-test v2 upgrade guide and change notes
- Passing in random generators in elm-test v2 doesn't do shrinking so best to avoid that escape hatch and instead implement an equivalent fuzzer
- Scott Wlaschin's post Choosing properties for property-based testing
- Discourse post on call for testing help and how to install the beta release
- Martin's video series on designing the new fuzz testing API
#testingchannel on the Elm Slack- Hypothesis library
- Hypothesis project's blog
- A paper about the Hypothesis reduction approach: Test-Case Reduction via Test-Case Generation: Insights From the Hypothesis Reducer