Fix tests for ARM CI

Author: mpuccio

Detectors/ITSMFT/common/tracking/test/testComputeLayerTrackletsOrchestration.cxx

@@ -16,6 +16,7 @@
 #include <array>
 #include <cmath>
 #include <functional>
+#include <limits>
 #include <memory>
 #include <utility>
 #include <vector>
@@ -303,10 +304,9 @@ TrackletSnapshot runFixture(o2::detectors::DetID::ID detector,
   // TrackerTraits::initialiseTimeFrame(), see TrackletFinding.h).
   // Exercised here for both Cylinder and Disk through the
   // existing fixture rather than a separate harness. Beyond finiteness, each
-  // entry is checked bit-for-bit against computeLegacyEdgeMSAndPhiCut's
-  // independent oracle -- the only replay-grade acceptance evidence for the
-  // common Cylinder path, since no real-geometry common-CA ITS
-  // replay exists yet.
+  // entry is checked against computeLegacyEdgeMSAndPhiCut's independent oracle.
+  // Allow a small relative rounding difference in the independently evaluated
+  // phi cuts, which can differ by one float ULP on ARM.
   {
     const auto preparedTopology = layoutView;
     const auto& msAngles = tf.getEdgeMSAngles();
@@ -328,7 +328,7 @@ TrackletSnapshot runFixture(o2::detectors::DetID::ID detector,
     BOOST_REQUIRE_EQUAL(expectedPhiCuts.size(), phiCuts.size());
     for (int id = 0; id < preparedTopology.nEdges; ++id) {
       BOOST_CHECK_EQUAL(msAngles[id], expectedMSAngles[id]);
-      BOOST_CHECK_EQUAL(phiCuts[id], expectedPhiCuts[id]);
+      BOOST_CHECK_CLOSE_FRACTION(phiCuts[id], expectedPhiCuts[id], 4.f * std::numeric_limits<float>::epsilon());
     }
   }