src/Assertions.hs

   1 -- | The Assertions module contains assertions for use in HUnit
   2 --   tests. They primarily fill the need for an equality test that
   3 --   works with floating point numbers.
   4 module Assertions
   5 where
   6
   7 import Control.Monad (unless)
   8 import Test.HUnit
   9
  10 import Comparisons
  11 import Point
  12
  13 -- | An HUnit assertion that wraps the almost_equals function. Stolen
  14 --   from the definition of 'assertEqual' in Test\/HUnit\/Base.hs.
  15 assertAlmostEqual :: String -> Double -> Double -> Assertion
  16 assertAlmostEqual preface expected actual =
  17   unless (actual ~= expected) (assertFailure msg)
  18     where msg = (if null preface then "" else preface ++ "\n") ++
  19                 "expected: " ++ show expected ++ "\n but got: " ++ show actual
  20
  21
  22 -- | An HUnit assertion that wraps the is_close function. Stolen
  23 --   from the definition of 'assertEqual' in Test\/HUnit\/Base.hs.
  24 assertClose :: String -> Point -> Point -> Assertion
  25 assertClose preface expected actual =
  26   unless (actual `is_close` expected) (assertFailure msg)
  27     where msg = (if null preface then "" else preface ++ "\n") ++
  28                 "expected: " ++ show expected ++ "\n but got: " ++ show actual
  29
  30 -- | It's asinine that this doesn't exist already.
  31 assertTrue :: String -> Bool -> Assertion
  32 assertTrue = assertBool