DocTest
What is DocTest
DocTest is a small program, that checks examples in Haskell comments. It is modeled after doctest for Python.
Tutorial
Bellow is a small Haskell module. The module contains source code comments. Those comments are examples from an interactive Haskell session and demonstrate how the module is used.
module Fib where
-- Examples:
--
-- > fib 10
-- 55
-- > fib 5
-- 5
fib 0 = 0
fib 1 = 1
fib n = fib (n - 1) + fib (n - 2)
With DocTest you may checks if the implementation satisfies the given examples, by typing (on your Unix shell):
$ doctest Fib.hs
Lines starting with -- > denote expressions.
All comment lines following an expression denote the
result of that expression. Result is defined by what an REPL
(e.g. ghci) prints to stdout and stderror when
evaluating that expression.
DocTest on Hackage
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/DocTest