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 // This file is part of the ACTS project.
 //
 // Copyright (C) 2016 CERN for the benefit of the ACTS project
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 #include <boost/test/unit_test.hpp>
 
 #include "Acts/Definitions/Algebra.hpp"
 #include "Acts/Definitions/Common.hpp"
 #include "Acts/Definitions/Direction.hpp"
 #include "Acts/Definitions/TrackParametrization.hpp"
 #include "Acts/Definitions/Units.hpp"
 #include "Acts/EventData/Charge.hpp"
 #include "Acts/EventData/GenericBoundTrackParameters.hpp"
 #include "Acts/EventData/TrackParameters.hpp"
 #include "Acts/Geometry/GeometryContext.hpp"
 #include "Acts/Geometry/GeometryIdentifier.hpp"
 #include "Acts/MagneticField/ConstantBField.hpp"
 #include "Acts/MagneticField/MagneticFieldContext.hpp"
 #include "Acts/Propagator/EigenStepper.hpp"
 #include "Acts/Propagator/Propagator.hpp"
 #include "Acts/Surfaces/PerigeeSurface.hpp"
 #include "Acts/Surfaces/Surface.hpp"
 #include "Acts/Tests/CommonHelpers/FloatComparisons.hpp"
 #include "Acts/Utilities/Result.hpp"
 #include "Acts/Vertexing/FullBilloirVertexFitter.hpp"
 #include "Acts/Vertexing/HelicalTrackLinearizer.hpp"
 #include "Acts/Vertexing/IVertexFinder.hpp"
 #include "Acts/Vertexing/ImpactPointEstimator.hpp"
 #include "Acts/Vertexing/IterativeVertexFinder.hpp"
 #include "Acts/Vertexing/TrackAtVertex.hpp"
 #include "Acts/Vertexing/Vertex.hpp"
 #include "Acts/Vertexing/VertexingOptions.hpp"
 #include "Acts/Vertexing/ZScanVertexFinder.hpp"
 
 #include <algorithm>
 #include <array>
 #include <cmath>
 #include <functional>
 #include <iostream>
 #include <iterator>
 #include <memory>
 #include <numbers>
 #include <optional>
 #include <random>
 #include <string>
 #include <system_error>
 #include <tuple>
 #include <type_traits>
 #include <utility>
 #include <vector>
 
 #include "VertexingDataHelper.hpp"
 
 using namespace Acts::UnitLiterals;
 
 namespace Acts::Test {
 
 using Covariance = BoundSquareMatrix;
 using Propagator = Acts::Propagator<EigenStepper<>>;
 using Linearizer = HelicalTrackLinearizer;
 
 // Create a test context
 GeometryContext geoContext = GeometryContext();
 MagneticFieldContext magFieldContext = MagneticFieldContext();
 
 const std::string toolString = "IVF";
 
 // Vertex x/y position distribution
 std::uniform_real_distribution<double> vXYDist(-0.1_mm, 0.1_mm);
 // Vertex z position distribution
 std::uniform_real_distribution<double> vZDist(-20_mm, 20_mm);
 // Track d0 distribution
 std::uniform_real_distribution<double> d0Dist(-0.01_mm, 0.01_mm);
 // Track z0 distribution
 std::uniform_real_distribution<double> z0Dist(-0.2_mm, 0.2_mm);
 // Track pT distribution
 std::uniform_real_distribution<double> pTDist(0.4_GeV, 10_GeV);
 // Track phi distribution
 std::uniform_real_distribution<double> phiDist(-std::numbers::pi,
                                                std::numbers::pi);
 // Track theta distribution
 std::uniform_real_distribution<double> thetaDist(1., std::numbers::pi - 1.);
 // Track charge helper distribution
 std::uniform_real_distribution<double> qDist(-1, 1);
 // Track IP resolution distribution
 std::uniform_real_distribution<double> resIPDist(0., 100_um);
 // Track angular distribution
 std::uniform_real_distribution<double> resAngDist(0., 0.1);
 // Track q/p resolution distribution
 std::uniform_real_distribution<double> resQoPDist(-0.01, 0.01);
 // Number of vertices per test event distribution
 std::uniform_int_distribution<std::uint32_t> nVertexDist(1, 6);
 // Number of tracks per vertex distribution
 std::uniform_int_distribution<std::uint32_t> nTracksDist(5, 15);
 
 // Dummy user-defined InputTrack type
 struct InputTrackStub {
   InputTrackStub(const BoundTrackParameters& params) : m_parameters(params) {}
 
   const BoundTrackParameters& parameters() const { return m_parameters; }
 
   // store e.g. link to original objects here
 
  private:
   BoundTrackParameters m_parameters;
 };
 
 ///
 /// @brief Unit test for IterativeVertexFinder for BoundTrackParameters
 ///
 BOOST_AUTO_TEST_CASE(iterative_finder_test) {
   bool debug = false;
 
   // Set up RNG
   int mySeed = 31415;
   std::mt19937 gen(mySeed);
 
   // Number of test events
   unsigned int nEvents = 5;  // = nTest
 
   // Set up constant B-Field
   auto bField = std::make_shared<ConstantBField>(Vector3{0.0, 0.0, 1_T});
 
   for (unsigned int iEvent = 0; iEvent < nEvents; ++iEvent) {
     // Set up Eigenstepper
     EigenStepper<> stepper(bField);
 
     // Set up propagator with void navigator
     auto propagator = std::make_shared<Propagator>(stepper);
 
     // Linearizer for BoundTrackParameters type test
     Linearizer::Config ltConfig;
     ltConfig.bField = bField;
     ltConfig.propagator = propagator;
     Linearizer linearizer(ltConfig);
 
     using BilloirFitter = FullBilloirVertexFitter;
 
     // Set up Billoir Vertex Fitter
     BilloirFitter::Config vertexFitterCfg;
     vertexFitterCfg.extractParameters.connect<&InputTrack::extractParameters>();
     vertexFitterCfg.trackLinearizer.connect<&Linearizer::linearizeTrack>(
         &linearizer);
 
     BilloirFitter bFitter(vertexFitterCfg);
 
     ImpactPointEstimator::Config ipEstimatorCfg(bField, propagator);
     ImpactPointEstimator ipEstimator(ipEstimatorCfg);
 
     using ZScanSeedFinder = ZScanVertexFinder;
 
     ZScanSeedFinder::Config seedFinderCfg(ipEstimator);
     seedFinderCfg.extractParameters.connect<&InputTrack::extractParameters>();
 
     auto sFinder = std::make_shared<ZScanSeedFinder>(seedFinderCfg);
 
     // Vertex Finder
 
     IterativeVertexFinder::Config cfg(std::move(bFitter), std::move(sFinder),
                                       ipEstimator);
     cfg.field = bField;
     cfg.trackLinearizer.connect<&Linearizer::linearizeTrack>(&linearizer);
 
     cfg.reassignTracksAfterFirstFit = true;
     cfg.extractParameters.connect<&InputTrack::extractParameters>();
 
     IterativeVertexFinder finder(std::move(cfg));
     IVertexFinder::State state{
         IterativeVertexFinder::State(*bField, magFieldContext)};
 
     // Vector to be filled with all tracks in current event
     std::vector<std::unique_ptr<const BoundTrackParameters>> tracks;
 
     std::vector<InputTrack> inputTracks;
 
     // Vector to be filled with truth vertices for later comparison
     std::vector<Vertex> trueVertices;
 
     // start creating event with nVertices vertices
     std::uint32_t nVertices = nVertexDist(gen);
     for (std::uint32_t iVertex = 0; iVertex < nVertices; ++iVertex) {
       // Number of tracks
       std::uint32_t nTracks = nTracksDist(gen);
 
       if (debug) {
         std::cout << "Event " << iEvent << ", Vertex " << iVertex << "/"
                   << nVertices << " with " << nTracks << " tracks."
                   << std::endl;
       }
       // Create perigee surface
       std::shared_ptr<PerigeeSurface> perigeeSurface =
           Surface::makeShared<PerigeeSurface>(Vector3(0., 0., 0.));
 
       // Create position of vertex and perigee surface
       double x = vXYDist(gen);
       double y = vXYDist(gen);
       double z = vZDist(gen);
 
       // True vertex
       Vertex trueV(Vector3(x, y, z));
       std::vector<TrackAtVertex> tracksAtTrueVtx;
 
       // Calculate d0 and z0 corresponding to vertex position
       double d0_v = std::hypot(x, y);
       double z0_v = z;
 
       // Construct random track emerging from vicinity of vertex position
       // Vector to store track objects used for vertex fit
       for (unsigned int iTrack = 0; iTrack < nTracks; iTrack++) {
         // Construct positive or negative charge randomly
         double q = qDist(gen) < 0 ? -1. : 1.;
 
         // Construct random track parameters
         BoundVector paramVec;
         double z0track = z0_v + z0Dist(gen);
         paramVec << d0_v + d0Dist(gen), z0track, phiDist(gen), thetaDist(gen),
             q / pTDist(gen), 0.;
 
         // Resolutions
         double res_d0 = resIPDist(gen);
         double res_z0 = resIPDist(gen);
         double res_ph = resAngDist(gen);
         double res_th = resAngDist(gen);
         double res_qp = resQoPDist(gen);
 
         // Fill vector of track objects with simple covariance matrix
         Covariance covMat;
         covMat << res_d0 * res_d0, 0., 0., 0., 0., 0., 0., res_z0 * res_z0, 0.,
             0., 0., 0., 0., 0., res_ph * res_ph, 0., 0., 0., 0., 0., 0.,
             res_th * res_th, 0., 0., 0., 0., 0., 0., res_qp * res_qp, 0., 0.,
             0., 0., 0., 0., 1.;
         auto params =
             BoundTrackParameters(perigeeSurface, paramVec, std::move(covMat),
                                  ParticleHypothesis::pion());
 
         tracks.push_back(std::make_unique<BoundTrackParameters>(params));
 
         TrackAtVertex trAtVt(0., params, InputTrack{tracks.back().get()});
         tracksAtTrueVtx.push_back(trAtVt);
       }
 
       trueV.setTracksAtVertex(tracksAtTrueVtx);
       trueVertices.push_back(trueV);
 
     }  // end loop over vertices
 
     // shuffle list of tracks
     std::shuffle(std::begin(tracks), std::end(tracks), gen);
 
     for (const auto& trk : tracks) {
       inputTracks.emplace_back(trk.get());
     }
 
     VertexingOptions vertexingOptions(geoContext, magFieldContext);
 
     // find vertices
     auto res = finder.find(inputTracks, vertexingOptions, state);
 
     if (!res.ok()) {
       BOOST_FAIL(res.error().message());
     }
 
     // Retrieve vertices found by vertex finder
     auto vertexCollection = *res;
 
     // check if same amount of vertices has been found with tolerance of 2
     CHECK_CLOSE_ABS(vertexCollection.size(), nVertices, 2);
 
     if (debug) {
       std::cout << "########## RESULT: ########## Event " << iEvent
                 << std::endl;
       std::cout << "Number of true vertices: " << nVertices << std::endl;
       std::cout << "Number of reco vertices: " << vertexCollection.size()
                 << std::endl;
 
       int count = 1;
       std::cout << "----- True vertices -----" << std::endl;
       for (const auto& vertex : trueVertices) {
         Vector3 pos = vertex.position();
         std::cout << count << ". True Vertex:\t Position:"
                   << "(" << pos[eX] << "," << pos[eY] << "," << pos[eZ] << ")"
                   << std::endl;
         std::cout << "Number of tracks: " << vertex.tracks().size() << std::endl
                   << std::endl;
         count++;
       }
       std::cout << "----- Reco vertices -----" << std::endl;
       count = 1;
       for (const auto& vertex : vertexCollection) {
         Vector3 pos = vertex.position();
         std::cout << count << ". Reco Vertex:\t Position:"
                   << "(" << pos[eX] << "," << pos[eY] << "," << pos[eZ] << ")"
                   << std::endl;
         std::cout << "Number of tracks: " << vertex.tracks().size() << std::endl
                   << std::endl;
         count++;
       }
     }
 
     // Check if all vertices have been found with close z-values
     bool allVerticesFound = true;
     for (const auto& trueVertex : trueVertices) {
       Vector4 truePos = trueVertex.fullPosition();
       bool currentVertexFound = false;
       for (const auto& recoVertex : vertexCollection) {
         Vector4 recoPos = recoVertex.fullPosition();
         // check only for close z distance
         double zDistance = std::abs(truePos[eZ] - recoPos[eZ]);
         if (zDistance < 2_mm) {
           currentVertexFound = true;
         }
       }
       if (!currentVertexFound) {
         allVerticesFound = false;
       }
     }
 
     // check if found vertices have compatible z values
     BOOST_CHECK(allVerticesFound);
   }
 }
 
 ///
 /// @brief Unit test for IterativeVertexFinder
 ///        for user defined InputTrack track type
 ///
 BOOST_AUTO_TEST_CASE(iterative_finder_test_user_track_type) {
   bool debug = false;
 
   // Set up RNG
   int mySeed = 31415;
   std::mt19937 gen(mySeed);
 
   // Number of test events
   unsigned int nEvents = 5;  // = nTest
 
   // Set up constant B-Field
   auto bField = std::make_shared<ConstantBField>(Vector3{0.0, 0.0, 1_T});
 
   for (unsigned int iEvent = 0; iEvent < nEvents; ++iEvent) {
     // Set up Eigenstepper
     EigenStepper<> stepper(bField);
 
     // Set up propagator with void navigator
     auto propagator = std::make_shared<Propagator>(stepper);
 
     // Linearizer for user defined InputTrackStub type test
     Linearizer::Config ltConfigUT;
     ltConfigUT.bField = bField;
     ltConfigUT.propagator = propagator;
     Linearizer linearizer(ltConfigUT);
 
     // Set up vertex fitter for user track type
     using BilloirFitter = FullBilloirVertexFitter;
 
     // Create a custom std::function to extract BoundTrackParameters from
     // user-defined InputTrack
     auto extractParameters = [](const InputTrack& params) {
       return params.as<InputTrackStub>()->parameters();
     };
 
     // Set up Billoir Vertex Fitter
     BilloirFitter::Config vertexFitterCfg;
     vertexFitterCfg.extractParameters.connect(extractParameters);
     vertexFitterCfg.trackLinearizer.connect<&Linearizer::linearizeTrack>(
         &linearizer);
 
     BilloirFitter bFitter(vertexFitterCfg);
 
     ImpactPointEstimator::Config ipEstimatorCfg(bField, propagator);
     ImpactPointEstimator ipEstimator(ipEstimatorCfg);
 
     using ZScanSeedFinder = ZScanVertexFinder;
     ZScanSeedFinder::Config seedFinderCfg(ipEstimator);
     seedFinderCfg.extractParameters.connect(extractParameters);
 
     auto sFinder = std::make_shared<ZScanSeedFinder>(seedFinderCfg);
 
     // Vertex Finder
     IterativeVertexFinder::Config cfg(std::move(bFitter), std::move(sFinder),
                                       ipEstimator);
     cfg.reassignTracksAfterFirstFit = true;
     cfg.extractParameters.connect(extractParameters);
     cfg.trackLinearizer.connect<&Linearizer::linearizeTrack>(&linearizer);
     cfg.field = bField;
 
     IterativeVertexFinder finder(std::move(cfg));
     IVertexFinder::State state{
         IterativeVertexFinder::State(*bField, magFieldContext)};
 
     // Same for user track type tracks
     std::vector<std::unique_ptr<const InputTrackStub>> tracks;
 
     std::vector<InputTrack> inputTracks;
 
     // Vector to be filled with truth vertices for later comparison
     std::vector<Vertex> trueVertices;
 
     // start creating event with nVertices vertices
     std::uint32_t nVertices = nVertexDist(gen);
     for (std::uint32_t iVertex = 0; iVertex < nVertices; ++iVertex) {
       // Number of tracks
       std::uint32_t nTracks = nTracksDist(gen);
 
       if (debug) {
         std::cout << "Event " << iEvent << ", Vertex " << iVertex << "/"
                   << nVertices << " with " << nTracks << " tracks."
                   << std::endl;
       }
       // Create perigee surface
       std::shared_ptr<PerigeeSurface> perigeeSurface =
           Surface::makeShared<PerigeeSurface>(Vector3(0., 0., 0.));
 
       // Create position of vertex and perigee surface
       double x = vXYDist(gen);
       double y = vXYDist(gen);
       double z = vZDist(gen);
 
       // True vertex
       Vertex trueV(Vector3(x, y, z));
       std::vector<TrackAtVertex> tracksAtTrueVtx;
 
       // Calculate d0 and z0 corresponding to vertex position
       double d0_v = std::hypot(x, y);
       double z0_v = z;
 
       // Construct random track emerging from vicinity of vertex position
       // Vector to store track objects used for vertex fit
       for (std::uint32_t iTrack = 0; iTrack < nTracks; iTrack++) {
         // Construct positive or negative charge randomly
         double q = qDist(gen) < 0 ? -1. : 1.;
 
         // Construct random track parameters
         BoundVector paramVec;
         double z0track = z0_v + z0Dist(gen);
         paramVec << d0_v + d0Dist(gen), z0track, phiDist(gen), thetaDist(gen),
             q / pTDist(gen), 0.;
 
         // Resolutions
         double res_d0 = resIPDist(gen);
         double res_z0 = resIPDist(gen);
         double res_ph = resAngDist(gen);
         double res_th = resAngDist(gen);
         double res_qp = resQoPDist(gen);
 
         // Fill vector of track objects now for user track type
         Covariance covMat;
 
         covMat << res_d0 * res_d0, 0., 0., 0., 0., 0., 0., res_z0 * res_z0, 0.,
             0., 0., 0., 0., 0., res_ph * res_ph, 0., 0., 0., 0., 0., 0.,
             res_th * res_th, 0., 0., 0., 0., 0., 0., res_qp * res_qp, 0., 0.,
             0., 0., 0., 0., 1.;
         auto params =
             BoundTrackParameters(perigeeSurface, paramVec, std::move(covMat),
                                  ParticleHypothesis::pion());
 
         tracks.push_back(std::make_unique<InputTrackStub>(params));
 
         TrackAtVertex trAtVt(0., params, InputTrack{tracks.back().get()});
         tracksAtTrueVtx.push_back(trAtVt);
       }
 
       trueV.setTracksAtVertex(tracksAtTrueVtx);
       trueVertices.push_back(trueV);
 
     }  // end loop over vertices
 
     // shuffle list of tracks
     std::shuffle(std::begin(tracks), std::end(tracks), gen);
 
     for (const auto& trk : tracks) {
       inputTracks.emplace_back(trk.get());
     }
 
     VertexingOptions vertexingOptionsUT(geoContext, magFieldContext);
 
     // find vertices
     auto res = finder.find(inputTracks, vertexingOptionsUT, state);
 
     if (!res.ok()) {
       BOOST_FAIL(res.error().message());
     }
 
     // Retrieve vertices found by vertex finder
     auto vertexCollectionUT = *res;
 
     // check if same amount of vertices has been found with tolerance of 2
     CHECK_CLOSE_ABS(vertexCollectionUT.size(), nVertices, 2);
 
     if (debug) {
       std::cout << "########## RESULT: ########## Event " << iEvent
                 << std::endl;
       std::cout << "Number of true vertices: " << nVertices << std::endl;
       std::cout << "Number of reco vertices: " << vertexCollectionUT.size()
                 << std::endl;
 
       int count = 1;
       std::cout << "----- True vertices -----" << std::endl;
       for (const auto& vertex : trueVertices) {
         Vector3 pos = vertex.position();
         std::cout << count << ". True Vertex:\t Position:"
                   << "(" << pos[eX] << "," << pos[eY] << "," << pos[eZ] << ")"
                   << std::endl;
         std::cout << "Number of tracks: " << vertex.tracks().size() << std::endl
                   << std::endl;
         count++;
       }
       std::cout << "----- Reco vertices -----" << std::endl;
       count = 1;
       for (const auto& vertex : vertexCollectionUT) {
         Vector3 pos = vertex.position();
         std::cout << count << ". Reco Vertex:\t Position:"
                   << "(" << pos[eX] << "," << pos[eY] << "," << pos[eZ] << ")"
                   << std::endl;
         std::cout << "Number of tracks: " << vertex.tracks().size() << std::endl
                   << std::endl;
         count++;
       }
     }
 
     // Check if all vertices have been found with close z-values
     bool allVerticesFound = true;
     for (const auto& trueVertex : trueVertices) {
       Vector4 truePos = trueVertex.fullPosition();
       bool currentVertexFound = false;
       for (const auto& recoVertex : vertexCollectionUT) {
         Vector4 recoPos = recoVertex.fullPosition();
         // check only for close z distance
         double zDistance = std::abs(truePos[eZ] - recoPos[eZ]);
         if (zDistance < 2_mm) {
           currentVertexFound = true;
         }
       }
       if (!currentVertexFound) {
         allVerticesFound = false;
       }
     }
 
     // check if found vertices have compatible z values
     BOOST_CHECK(allVerticesFound);
   }
 }
 
 ///
 /// @brief Unit test for IterativeVertexFinder with Athena reference data
 ///
 BOOST_AUTO_TEST_CASE(iterative_finder_test_athena_reference) {
   // Set up constant B-Field
   auto bField = std::make_shared<ConstantBField>(Vector3{0.0, 0.0, 2_T});
 
   // Set up Eigenstepper
   EigenStepper<> stepper(bField);
 
   // Set up propagator with void navigator
   auto propagator = std::make_shared<Propagator>(stepper);
 
   // Linearizer for BoundTrackParameters type test
   Linearizer::Config ltConfig;
   ltConfig.bField = bField;
   ltConfig.propagator = propagator;
   Linearizer linearizer(ltConfig);
 
   using BilloirFitter = FullBilloirVertexFitter;
 
   // Set up Billoir Vertex Fitter
   BilloirFitter::Config vertexFitterCfg;
   vertexFitterCfg.extractParameters.connect<&InputTrack::extractParameters>();
   vertexFitterCfg.trackLinearizer.connect<&Linearizer::linearizeTrack>(
       &linearizer);
 
   BilloirFitter bFitter(vertexFitterCfg);
 
   ImpactPointEstimator::Config ipEstimatorCfg(bField, propagator);
   ImpactPointEstimator ipEstimator(ipEstimatorCfg);
 
   using ZScanSeedFinder = ZScanVertexFinder;
 
   ZScanSeedFinder::Config seedFinderCfg(ipEstimator);
   seedFinderCfg.extractParameters.connect<&InputTrack::extractParameters>();
 
   auto sFinder = std::make_shared<ZScanSeedFinder>(seedFinderCfg);
 
   IterativeVertexFinder::Config cfg(std::move(bFitter), std::move(sFinder),
                                     ipEstimator);
   cfg.maxVertices = 200;
   cfg.maximumChi2cutForSeeding = 49;
   cfg.significanceCutSeeding = 12;
   cfg.extractParameters.connect<&InputTrack::extractParameters>();
   cfg.trackLinearizer.connect<&Linearizer::linearizeTrack>(&linearizer);
   cfg.field = bField;
 
   IterativeVertexFinder finder(std::move(cfg));
   IVertexFinder::State state{
       IterativeVertexFinder::State(*bField, magFieldContext)};
 
   auto csvData = readTracksAndVertexCSV(toolString);
   auto tracks = std::get<TracksData>(csvData);
 
   std::vector<InputTrack> inputTracks;
   for (const auto& trk : tracks) {
     inputTracks.emplace_back(&trk);
   }
 
   Vertex beamSpot = std::get<BeamSpotData>(csvData);
   // Set time covariance
   SquareMatrix4 fullCovariance = SquareMatrix4::Zero();
   fullCovariance.topLeftCorner<3, 3>() = beamSpot.covariance();
   fullCovariance(eTime, eTime) = 100_ns;
   beamSpot.setFullCovariance(fullCovariance);
   VertexingOptions vertexingOptions(geoContext, magFieldContext, beamSpot);
 
   // find vertices
   auto findResult = finder.find(inputTracks, vertexingOptions, state);
 
   BOOST_CHECK(findResult.ok());
 
   if (!findResult.ok()) {
     std::cout << findResult.error().message() << std::endl;
   }
 
   // Retrieve vertices found by vertex finder
   // std::vector<Vertex> allVertices = *findResult;
 
   // Test expected outcomes from athena implementation
   // Number of reconstructed vertices
   // auto verticesInfo = std::get<VerticesData>(csvData);
   // const int expNRecoVertices = verticesInfo.size();
 
   // BOOST_CHECK_EQUAL(allVertices.size(), expNRecoVertices);
   // for (int i = 0; i < expNRecoVertices; i++) {
   //   auto recoVtx = allVertices[i];
   //   auto expVtx = verticesInfo[i];
   //   CHECK_CLOSE_ABS(recoVtx.position(), expVtx.position, 0.001_mm);
   //   CHECK_CLOSE_ABS(recoVtx.covariance(), expVtx.covariance, 0.001_mm);
   //   BOOST_CHECK_EQUAL(recoVtx.tracks().size(), expVtx.nTracks);
   //   CHECK_CLOSE_ABS(recoVtx.tracks()[0].trackWeight, expVtx.trk1Weight,
   //   0.003); CHECK_CLOSE_ABS(recoVtx.tracks()[0].vertexCompatibility,
   //   expVtx.trk1Comp,
   //                   0.003);
   // }
 }
 
 }  // namespace Acts::Test

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