module Util.Tests
  ( tests
  ) where

import           Test.Tasty
import           Test.Tasty.HUnit
import           Test.Tasty.QuickCheck as QC
import           Test.Tasty.SmallCheck as SC

import           Penrose.Util

tests :: TestTree
tests = testGroup "Utils tests" [properties, unitTests]

properties :: TestTree
properties = testGroup "Properties" [scProps, qcProps]

distNonnegative :: Float -> Float -> Float -> Float -> Bool
distNonnegative x1 y1 x2 y2 = dist (x1, y1) (x2, y2) >= 0

-- this is actually 1e-5
distNonNaN_atZero :: Assertion
distNonNaN_atZero = isNaN (dist (0, 0) (0, 0)) @?= False

scProps =
  testGroup
    "(checked by SmallCheck)" -- use SC.testProperty
    []

qcProps =
  testGroup
    "(checked by QuickCheck)"
    [QC.testProperty "dist: distance always non-negative" distNonnegative]

-- Module: topic: function: property
unitTests =
  testGroup "Unit tests" [testCase "autodiff: dist: no NaN" distNonNaN_atZero]