From 935d8dfb409d7317e833cd5f1e3f80312b9c3fb4 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Fri, 6 May 2011 18:37:47 -0400
Subject: [PATCH] Re-enable the prop_all_volumes_positive check and add some
 new ones.

---
 src/Tests/Cube.hs | 50 ++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 41 insertions(+), 9 deletions(-)

diff --git a/src/Tests/Cube.hs b/src/Tests/Cube.hs
index a832f5a..3cfefd4 100644
--- a/src/Tests/Cube.hs
+++ b/src/Tests/Cube.hs
@@ -3,9 +3,10 @@ where
 
 import Test.QuickCheck
 
-import Cube (Cube(Cube))
+import Cube
 import FunctionValues (FunctionValues(FunctionValues))
 import Tests.FunctionValues
+import Tetrahedron (v0, volume)
 
 instance Arbitrary Cube where
     arbitrary = do
@@ -25,11 +26,42 @@ instance Arbitrary Cube where
 -- | Since the grid size is necessarily positive, all tetrahedrons
 --   (which comprise cubes of positive volume) must have positive volume
 --   as well.
--- prop_all_volumes_positive :: Cube -> Property
--- prop_all_volumes_positive c =
---     (delta > 0) ==> (null nonpositive_volumes)
---     where
---       delta = h (grid c)
---       ts = tetrahedrons c
---       volumes = map volume ts
---       nonpositive_volumes = filter (<= 0) volumes
+prop_all_volumes_positive :: Cube -> Property
+prop_all_volumes_positive c =
+    (delta > 0) ==> (null nonpositive_volumes)
+    where
+      delta = h c
+      ts = tetrahedrons c
+      volumes = map volume ts
+      nonpositive_volumes = filter (<= 0) volumes
+
+-- | All tetrahedron should have their v0 located at the center of the cube.
+prop_v0_all_equal :: Cube -> Bool
+prop_v0_all_equal c = (v0 t0) == (v0 t1)
+    where
+      t0 = head (tetrahedrons c) -- Doesn't matter which two we choose.
+      t1 = head $ tail (tetrahedrons c)
+
+
+-- | This pretty much repeats the prop_all_volumes_positive property,
+--   but will let me know which face's vertices are disoriented.
+prop_front_face_volumes_positive :: Cube -> Property
+prop_front_face_volumes_positive c =
+    (delta > 0) ==> (null nonpositive_volumes)
+    where
+      delta = h c
+      ts = [tetrahedron0 c, tetrahedron1 c, tetrahedron2 c, tetrahedron3 c]
+      volumes = map volume ts
+      nonpositive_volumes = filter (<= 0) volumes
+
+
+-- | This pretty much repeats the prop_all_volumes_positive property,
+--   but will let me know which face's vertices are disoriented.
+prop_top_face_volumes_positive :: Cube -> Property
+prop_top_face_volumes_positive c =
+    (delta > 0) ==> (null nonpositive_volumes)
+    where
+      delta = h c
+      ts = [tetrahedron4 c, tetrahedron5 c, tetrahedron6 c, tetrahedron7 c]
+      volumes = map volume ts
+      nonpositive_volumes = filter (<= 0) volumes
-- 
2.43.2