From 1ec27f638dc7a33a026fb1551dcf304cda3adfde Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 11 May 2011 17:13:05 -0400
Subject: [PATCH] Add a test based on the computations on Sorokina and
 Zeilfelder, p. 87.

---
 src/Tests/Cube.hs | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/src/Tests/Cube.hs b/src/Tests/Cube.hs
index 0f0e926..5846977 100644
--- a/src/Tests/Cube.hs
+++ b/src/Tests/Cube.hs
@@ -5,9 +5,9 @@ import Test.QuickCheck
 
 import Comparisons
 import Cube
-import FunctionValues (FunctionValues)
+import FunctionValues
 import Tests.FunctionValues ()
-import Tetrahedron (b0, b1, b2, b3, c,
+import Tetrahedron (b0, b1, b2, b3, c, fv,
                     v0, v1, v2, v3, volume)
 
 instance Arbitrary Cube where
@@ -473,7 +473,7 @@ prop_c3000_identity cube =
     c t0 3 0 0 0 ~= c t0 2 1 0 0 + c t6 2 1 0 0 - ((c t0 2 0 1 0 + c t0 2 0 0 1)/ 2)
       where
         t0 = tetrahedron0 cube
-        t6 = tetrahedron6 cube
+        t6 = (tetrahedron6 cube) { v2 = (v3 t6), v3 = (v2 t6) }
 
 
 -- | Given in Sorokina and Zeilfelder, p. 79.
@@ -537,6 +537,35 @@ prop_c1011_identity cube =
 --         t1 = tetrahedron1 cube
 
 
+-- | We know what (c t6 2 1 0 0) should be from Sorokina and Zeilfelder, p. 87.
+prop_c_tilde_2100_correct :: Cube -> Bool
+prop_c_tilde_2100_correct cube =
+    c t6 2 1 0 0 == (3/8)*int + (1/12)*(f + r + l + b) + (1/64)*(ft + rt + lt + bt)
+                              + (7/48)*t + (1/48)*d + (1/96)*(fr + fl + br + bl)
+                              + (1/192)*(fd + rd + ld + bd)
+    where
+      t6 = tetrahedron6 cube
+      fvs = Tetrahedron.fv t6
+      int = interior fvs
+      f = front fvs
+      r = right fvs
+      l = left fvs
+      b = back fvs
+      ft = front_top fvs
+      rt = right_top fvs
+      lt = left_top fvs
+      bt = back_top fvs
+      t = top fvs
+      d = down fvs
+      fr = front_right fvs
+      fl = front_left fvs
+      br = back_right fvs
+      bl = back_left fvs
+      fd = front_down fvs
+      rd = right_down fvs
+      ld = left_down fvs
+      bd = back_down fvs
+
 -- Tests to check that the correct edges are incidental.
 prop_t0_shares_edge_with_t1 :: Cube -> Bool
 prop_t0_shares_edge_with_t1 cube =
-- 
2.43.2