DocTest

From HaskellWiki

1 What is DocTest

DocTest is a small program, that checks examples in Haddock comments. It is modeled after doctest for Python.

2 Installation

DocTest is available from Hackage. Install it by typing:

$ cabal install doctest

3 Usage

Below 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
 
-- | Compute Fibonacci numbers
--
-- Examples:
--
-- >>> fib 10
-- 55
--
-- >>> fib 5
-- 5
fib :: Int -> Int
fib 0 = 0
fib 1 = 1
fib n = fib (n - 1) + fib (n - 2)

All comment lines following an expression denote the result of that expression. Result is defined by what an REPL

evaluating that expression.)

With DocTest you may check if the implementation satisfies the given examples, by typing:

$ doctest Fib.hs

You may produce Haddock documentation for that module with:

$ haddock -h Fib.hs -o doc/

4 Hacking

DocTest is still experimental. You can find a reference to the public source repository at Hackage.

Patches are gladly welcome!