Cube.hs

   1 module Tests.Cube
   2 where
   3
   4 import Test.QuickCheck
   5
   6 import Cube (Cube(Cube))
   7 import FunctionValues (FunctionValues(FunctionValues))
   8 import Tests.FunctionValues
   9
  10 instance Arbitrary Cube where
  11     arbitrary = do
  12       (Positive h') <- arbitrary :: Gen (Positive Double)
  13       i' <- choose (coordmin, coordmax)
  14       j' <- choose (coordmin, coordmax)
  15       k' <- choose (coordmin, coordmax)
  16       fv' <- arbitrary :: Gen FunctionValues
  17       return (Cube h' i' j' k' fv')
  18         where
  19           coordmin = -268435456 -- -(2^29 / 2)
  20           coordmax = 268435456  -- +(2^29 / 2)
  21
  22
  23 -- Quickcheck tests.
  24
  25 -- | Since the grid size is necessarily positive, all tetrahedrons
  26 --   (which comprise cubes of positive volume) must have positive volume
  27 --   as well.
  28 -- prop_all_volumes_positive :: Cube -> Property
  29 -- prop_all_volumes_positive c =
  30 --     (delta > 0) ==> (null nonpositive_volumes)
  31 --     where
  32 --       delta = h (grid c)
  33 --       ts = tetrahedrons c
  34 --       volumes = map volume ts
  35 --       nonpositive_volumes = filter (<= 0) volumes