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Revision as of 12:00, 22 March 2009


1 What is DocTest

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

2 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 a REPL

(e.g. ghci) prints to

evaluating that expression.

3 DocTest on Hackage

4 Branches