chell

A quiet test runner for Haskell

Building

To build and test with all supported compiler versions:

nix build .#testConfigurations.all --no-link

History

Back in 2011 or so, the most popular Haskell test frameworks generated a lot of status output but relatively little info about why tests failed. John Millikin wrote Chell so that tests would be quiet if they passed, and give to-the-line error info on failure.

It hasn't seen much development effort the past few years. As of February 2019, Chris and Julie are keeping it compiling.

Assertions

Chell has a small selection of built-in assertions, which cover most simple testing requirements. Use the $assert or $expect functions to run assertions. See the Chell API documentation for full type signatures.

{-# LANGUAGE TemplateHaskell #-}
importTest.Chelltests::Suite
tests =
suite "tests"
[ test_Numbers
, test_Text
]
test_Numbers::Test
test_Numbers =
assertions "numbers"$do$assert (equal 11)
$assert (greater 21)
$assert (equalWithin 1.00011.00.01)
test_Text::Test
test_Text =
assertions "text"$dolet
str1 ="foo\nbar\nbaz"
str2 ="foo\nbar\nqux"$assert (equalLines str1 str2)
main::IO()
main = defaultMain [tests]

QuickCheck

Chell also supports running QuickCheck properties, via the chell-quickcheck package.

importTest.ChellimportTest.Chell.QuickChecktests::Suite
tests =
suite "tests"
[ test_Equality
, test_Increment
]
test_Equality::Test
test_Equality = property "equality" (\x -> x == x)
test_Increment::Test
test_Increment = property "equality" (\x -> x +1> x)
main::IO()
main = defaultMain [tests]