Use tolerance constants (ANG_TOL, R_TOL) instead of hardcoded values

tests/test_true_anomaly_roundtrip.cpp

@@ -2,6 +2,7 @@
 #include <catch2/matchers/catch_matchers_floating_point.hpp>
 #include "../src/physics.h"
 #include "../src/orbital_mechanics.h"
+#include "../src/test_utilities.h"
 #include <cmath>
 
 using Catch::Matchers::WithinAbs;
@@ -28,7 +29,7 @@ SCENARIO("True anomaly round-trip conversion and radius sanity checks",
 
         INFO("Expected nu: " << expected_nu);
         INFO("Reconstructed: " << reconstructed.true_anomaly);
-        REQUIRE_THAT(reconstructed.true_anomaly, WithinAbs(expected_nu, 1e-12));
+        REQUIRE_THAT(reconstructed.true_anomaly, WithinAbs(expected_nu, ANG_TOL));
     };
 
     SECTION("at periapsis (nu = 0)") { check_roundtrip(0.0); }
@@ -43,7 +44,7 @@ SCENARIO("True anomaly round-trip conversion and radius sanity checks",
         INFO("Expected r: " << expected_r_peri);
         INFO("Calculated r: " << r_peri);
 
-        REQUIRE_THAT(r_peri, WithinAbs(expected_r_peri, 1e-6));
+        REQUIRE_THAT(r_peri, WithinAbs(expected_r_peri, R_TOL));
     }
 
     SECTION("apoapsis radius = a*(1+e)") {
@@ -54,6 +55,6 @@ SCENARIO("True anomaly round-trip conversion and radius sanity checks",
 
         INFO("Expected r: " << expected_r_apo);
         INFO("Calculated r: " << r_apo);
-        REQUIRE_THAT(r_apo, WithinAbs(expected_r_apo, 1e-6));
+        REQUIRE_THAT(r_apo, WithinAbs(expected_r_apo, R_TOL));
     }
 }