Haskell's type system makes large classes of traditional "unit tests"
irrelevant. Here are some examples:
- Tests that simply "run" code to make sure there are no syntax
errors or typos,
- Tests that exercise simple input validation that is handled by the
type system, i.e. passing an integer to a function when it
expects a string,
But, as many other people have mentioned, that doesn't nearly cover all
unit tests (although when I look at some people's unit tests, one might
think this was the case.)
Cheers,
Edward
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