From edbb25327a2aba95df1d82ba3dbe6f7e2b08426f Mon Sep 17 00:00:00 2001
From: NAThompson <nathompson7@protonmail.com>
Date: Mon, 12 Aug 2019 10:11:58 -0400
Subject: [PATCH] Cardinal B-spline derivatives: Fix typo in test that made it
 much less powerful.

---
 test/cardinal_b_spline_test.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/test/cardinal_b_spline_test.cpp b/test/cardinal_b_spline_test.cpp
index 04ad3a0de..0ec92cc95 100644
--- a/test/cardinal_b_spline_test.cpp
+++ b/test/cardinal_b_spline_test.cpp
@@ -199,15 +199,15 @@ void test_b_spline_derivatives()
 {
     Real h = 1/Real(256);
     Real supp = (n+Real(1))/Real(2);
-    for (Real t = supp - 1; t <= supp+1; t+= h)
+    for (Real t = -supp - 1; t <= supp+1; t+= h)
     {
         Real expected = cardinal_b_spline<n-1>(t+Real(1)/Real(2)) - cardinal_b_spline<n-1>(t - Real(1)/Real(2));
         Real computed = cardinal_b_spline_prime<n>(t);
-        CHECK_ULP_CLOSE(expected, computed, 2);
+        CHECK_MOLLIFIED_CLOSE(expected, computed, std::numeric_limits<Real>::epsilon());
 
         expected = cardinal_b_spline<n-2>(t+1) - 2*cardinal_b_spline<n-2>(t) + cardinal_b_spline<n-2>(t-1);
         computed = cardinal_b_spline_double_prime<n>(t);
-        CHECK_ULP_CLOSE(expected, computed, 2);
+        CHECK_MOLLIFIED_CLOSE(expected, computed, 2*std::numeric_limits<Real>::epsilon());
     }
 }