TEST: Tweak test tolerance

test/test_splinterpolator.cc

@@ -5,6 +5,7 @@
 
 #include <armadillo>
 
+#include <cmath>
 #include <filesystem>
 #include <stdlib.h>
 #include <vector>
@@ -141,10 +142,18 @@ public:
 
 
   // compare two float vectors
-  void compare(std::vector<float> a, std::vector<float> b, float tol=1e-5) {
+  void compare(std::vector<float> a, std::vector<float> b, float tol=1e-4) {
+
     BOOST_CHECK_EQUAL(a.size(), b.size());
     for (auto i = 0; i < a.size(); i++) {
-      BOOST_CHECK_SMALL(a[i] - b[i], tol);
+
+      auto va = a[i];
+      auto vb = b[i];
+
+      if (std::abs(va) < 1e-10) va = 0;
+      if (std::abs(vb) < 1e-10) vb = 0;
+
+      BOOST_CHECK_CLOSE(va, vb, tol);
     }
   }