Prefer table driven tests (2019)

• rapid

  4 551 5.8 Go

  Rapid is a modern Go property-based testing library

> and also to automatically shrink any counterexamples it finds to be as simple as possible.

This actually is a problém with most quickcheck clones (and quickcheck itself), that's why it's better to use a library that is inspired by Python's Hypothesis (combining generation and shrinking, in a nutshell). So Hedgehog for Haskell and F# (instead of Fscheck) and Rapid for Go https://github.com/flyingmutant/rapid

But tables and property tests complement each other, even if you can get rid of some tables by using property testing.

Example article about the shrinking of Hypothesis vs. Quickcheck

• base32h.rb

  1 1 10.0 Ruby

  Base32H encoder/decoder in Ruby

  

I'm fond of taking this a step further and actually offloading the test cases to a separate language-agnostic file, then have implementations' test harnesses read cases from that file. The Ruby gem for Base32H¹ does exactly this to test the encoder/decoder logic, pulling the test cases from CSV files in a separate repo² included as a Git submodule. One of these days I need to port the other reference implementations over to using the tests repo, but once that's done I'll be able to update the test cases in one place and they'll automatically work everywhere.

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¹ https://github.com/Base32H/base32h.rb/tree/master/spec

² https://github.com/Base32H/base32h-tests

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• base32h-tests

  1 1 10.0

  Base32H Test Suite

  

I'm fond of taking this a step further and actually offloading the test cases to a separate language-agnostic file, then have implementations' test harnesses read cases from that file. The Ruby gem for Base32H¹ does exactly this to test the encoder/decoder logic, pulling the test cases from CSV files in a separate repo² included as a Git submodule. One of these days I need to port the other reference implementations over to using the tests repo, but once that's done I'll be able to update the test cases in one place and they'll automatically work everywhere.

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¹ https://github.com/Base32H/base32h.rb/tree/master/spec

² https://github.com/Base32H/base32h-tests

• American Fuzzy Lop

  21 2,903 0.0 C

  Discontinued american fuzzy lop - a security-oriented fuzzer

  

There's some efforts to guide test generation for property based testing to make the instruction pointer explore as large a space as possible.

This effort is more mature in the fuzzing community. See eg American Fuzzy Lop https://github.com/google/AFL

• datadriven

  2 39 1.2 Go

  Data-Driven Testing for Go

  

Table driven tests are a lot better than a bunch of imperative tests but they rapidly become unwieldy to debug, maintain, and evolve. Their readability often isn’t great.

If you’re using go, check out https://github.com/cockroachdb/datadriven. It takes a little bit of effort to craft a testing dsl, but it is so worth it.

Also, snapshot style testing where the test writes out its expectations and you just inspect it and save it (part of datadriven) is wonderful.

I’ve been using insta in rust lately and it’s some of what I want but not quite datadriven.

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