Testing is hard, as can be seen in the last two episodes. That's why I looked around for better alternatives and found proptest.

Let's take a look at proptest, a library for automatically generating testcases similar to quickcheck (of Haskell fame). We will parse informal english dates like "4th of September 1927" using Proptest and TDD.

▶ Run and edit the code on Gitpod

Keywords

Property testing, Quickcheck, Unit testing, Fuzzy testing, TDD

Things I mentioned during the show

• Proptest crate by Jason Lingle
• Quickcheck crate for Rust by Andrew Gallant
• History of quickcheck
• Chrono english crate by Steve J Donovan

Errata and improvements

It might come as a surprise to you, but every once in a while even I make a mistake. This section covers all improvements made to the code since the episode went live. For an exhaustive list of all changes to the original code, go here. Thanks to all contributors!

• vikrrrr found a beautiful way to parse the month using Option::map.

Meta

• I prefer to use ok_or_else as ok_or evaluates eagerly and might get deprecated

Resources and licenses

• Pizzicato by Setuniman: https://freesound.org/people/Setuniman/sounds/149827/
• Lynx pizzicanto by filmistro: https://filmstro.com/music/pizzicato-strings
• Bug image: https://www.freepik.com/free-vector/funny-insects-icon-set_1488662.htm#term=bug&page=1&position=9

Support!

Preparing, recording, and editing an episode takes a substantial amount of time (around 30 hours total). I do all of this next to my fulltime dayjob. If you want to show your appreciation and help me keep the content free for everybody to enjoy, please consider sponsoring me on Github - no matter the amount. ❤️