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DocTest

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Revision as of 12:16, 22 March 2009 by SimonHengel (Talk | contribs)

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Contents

1 What is DocTest

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

2 Installation

DocTest is available from Hackage. Install it by typing (on your Unix shell):

$ cabal install doctest

3 Usage

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.

4 Hacking

DocTest development is in an early stage. My public git repository is at:

http://code.haskell.org/~sih/code/DocTest.git/

Patches are gladly welcome!