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Types and Testing in Haskell

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Published on Nov 25, 2014

New York Haskell Users Group, November 13, 2014

Types and Testing in Haskell by Daniel Patterson

How should you test code in Haskell? What do tests give that types don't, and vice versa? This talk will start with a quick introduction to techniques for testing in Haskell. After, we'll deal with the following questions: Where (and how) should we strengthen types? Where should we have more (or fewer) tests? And how should we be thinking about testing in a language with a type system as expressive as what Haskell has? Our goal is to end up with a more nuanced view of correctness than just "it type checked, so it's (probably) right", and to think about what it means to be (reasonably) sure that code is correct.

Daniel Patterson has been writing web code in Haskell since late 2007, and more recently started Position Development, a software consultancy building web based applications primarily in Haskell. He's interested in whatever can make writing correct software easier, whether it be expressive static types (with Haskell being a great example), or figuring out how to make testing easier. As an example of the latter, he was central in developing syntactically convenient testing blocks in the education oriented language Pyret at Brown University.

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