Add the trilinearx2 reproduction test.

[spline3.git] / src / Tests / Grid.hs

diff --git a/src/Tests/Grid.hs b/src/Tests/Grid.hs
index ad7bab92c62f677c08a6e35fdd7335f3acfd131e..55ca31e4a1455137f42835fdbbaf16e532f686ea 100644 (file)
--- a/src/Tests/Grid.hs
+++ b/src/Tests/Grid.hs
@@ -704,3 +704,21 @@ test_zeros_reproduced =
       c0 = fromJust $ cube_at g 1 1 1
       t0 = tetrahedron0 c0
       p = polynomial t0
+
+
+-- | Make sure we can reproduce a 9x9x9 trilinear from the 3x3x3 one.
+test_trilinearx2_reproduced_t0 :: Assertion
+test_trilinearx2_reproduced_t0 =
+    assertTrue "trilinearx2 is reproduced correctly" $
+      and [p (i', j', k') ~= value_at trilinearx2 i j k
+            | i <- [0..8],
+              j <- [0..8],
+              k <- [0..8],
+              let i' = (fromIntegral i) * 0.5,
+              let j' = (fromIntegral j) * 0.5,
+              let k' = (fromIntegral k) * 0.5]
+    where
+      g = make_grid 1 trilinear
+      c0 = fromJust $ cube_at g 1 1 1
+      t0 = tetrahedron0 c0
+      p = polynomial t0