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|
-- | Helpers for testing
module Tests.Helpers (
-- * helpers
T(..)
, typeName
, eq
, eqC
-- * Generic QC tests
, monotonicallyIncreases
-- * HUnit helpers
, testAssertion
, testEquality
) where
import Data.Complex
import Data.Typeable
import Test.Tasty
import Test.Tasty.HUnit
import Numeric.MathFunctions.Comparison
----------------------------------------------------------------
-- Helpers
----------------------------------------------------------------
-- | Phantom typed value used to select right instance in QC tests
data T a = T
-- | String representation of type name
typeName :: Typeable a => T a -> String
typeName = show . typeOf . typeParam
where
typeParam :: T a -> a
typeParam _ = undefined
-- | Approximate equality for 'Double'. Doesn't work well for numbers
-- which are almost zero.
eq :: Double -- ^ Relative error
-> Double -> Double -> Bool
eq = eqRelErr
-- | Approximate equality for 'Complex Double'
eqC :: Double -- ^ Relative error
-> Complex Double
-> Complex Double
-> Bool
eqC eps a@(ar :+ ai) b@(br :+ bi)
| a == 0 && b == 0 = True
| otherwise = abs (ar - br) <= eps * d
&& abs (ai - bi) <= eps * d
where
d = max (realPart $ abs a) (realPart $ abs b)
----------------------------------------------------------------
-- Generic QC
----------------------------------------------------------------
-- Check that function is nondecreasing
monotonicallyIncreases :: (Ord a, Ord b) => (a -> b) -> a -> a -> Bool
monotonicallyIncreases f x1 x2 = f (min x1 x2) <= f (max x1 x2)
----------------------------------------------------------------
-- HUnit helpers
----------------------------------------------------------------
testAssertion :: String -> Bool -> TestTree
testAssertion str cont = testCase str $ assertBool str cont
testEquality :: (Show a, Eq a) => String -> a -> a -> TestTree
testEquality msg a b = testCase msg $ assertEqual msg a b
|
