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HitTests.cpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2020 CERN for the benefit of the Acts project
4 //
5 // This Source Code Form is subject to the terms of the Mozilla Public
6 // License, v. 2.0. If a copy of the MPL was not distributed with this
7 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 
9 #include <boost/test/unit_test.hpp>
10 
15 
16 #include <limits>
17 
18 using namespace ActsFatras;
19 
20 namespace {
21 constexpr auto eps = std::numeric_limits<Hit::Scalar>::epsilon();
22 const auto pid = Barcode().setVertexPrimary(12).setParticle(23);
23 const auto gid =
25 } // namespace
26 
27 BOOST_AUTO_TEST_SUITE(FatrasHit)
28 
29 BOOST_AUTO_TEST_CASE(WithoutInteraction) {
30  // some hit position
31  auto p4 = Hit::Vector4(1, 2, 3, 4);
32  // before/after four-momenta are the same
33  auto m4 = Hit::Vector4(1, 1, 1, 4);
34  auto h = Hit(gid, pid, p4, m4, m4, 12u);
35 
36  BOOST_CHECK_EQUAL(h.geometryId(), gid);
37  BOOST_CHECK_EQUAL(h.particleId(), pid);
38  BOOST_CHECK_EQUAL(h.index(), 12u);
39  CHECK_CLOSE_REL(h.fourPosition(), p4, eps);
40  CHECK_CLOSE_REL(h.position(), Hit::Vector3(1, 2, 3), eps);
41  CHECK_CLOSE_REL(h.time(), 4, eps);
42  CHECK_CLOSE_REL(h.momentum4Before(), m4, eps);
43  CHECK_CLOSE_REL(h.momentum4After(), m4, eps);
44  CHECK_CLOSE_REL(h.directionBefore(), Hit::Vector3(1, 1, 1).normalized(), eps);
45  CHECK_CLOSE_REL(h.directionAfter(), Hit::Vector3(1, 1, 1).normalized(), eps);
46  CHECK_CLOSE_REL(h.direction(), Hit::Vector3(1, 1, 1).normalized(), eps);
47  CHECK_SMALL(h.depositedEnergy(), eps);
48 }
49 
50 BOOST_AUTO_TEST_CASE(WithEnergyLoss) {
51  // some hit position
52  auto p4 = Hit::Vector4(1, 2, 3, 4);
53  // before/after four-momenta differ by energy loss, use zero mass to simplify
54  auto m40 = Hit::Vector4(2, 0, 0, 2);
55  auto m41 = Hit::Vector4(1.5, 0, 0, 1.5);
56  auto h = Hit(gid, pid, p4, m40, m41, 13u);
57 
58  BOOST_CHECK_EQUAL(h.geometryId(), gid);
59  BOOST_CHECK_EQUAL(h.particleId(), pid);
60  BOOST_CHECK_EQUAL(h.index(), 13u);
61  CHECK_CLOSE_REL(h.fourPosition(), p4, eps);
62  CHECK_CLOSE_REL(h.position(), Hit::Vector3(1, 2, 3), eps);
63  CHECK_CLOSE_REL(h.time(), 4, eps);
64  CHECK_CLOSE_OR_SMALL(h.momentum4Before(), m40, eps, eps);
65  CHECK_CLOSE_OR_SMALL(h.momentum4After(), m41, eps, eps);
66  CHECK_CLOSE_OR_SMALL(h.directionBefore(), Hit::Vector3(1, 0, 0), eps, eps);
67  CHECK_CLOSE_OR_SMALL(h.directionAfter(), Hit::Vector3(1, 0, 0), eps, eps);
68  CHECK_CLOSE_OR_SMALL(h.direction(), Hit::Vector3(1, 0, 0), eps, eps);
69  CHECK_CLOSE_REL(h.depositedEnergy(), 0.5, eps);
70 }
71 
72 BOOST_AUTO_TEST_CASE(WithScattering) {
73  // some hit position
74  auto p4 = Hit::Vector4(1, 2, 3, 4);
75  // before/after four-momenta differ only by direction
76  auto m40 = Hit::Vector4(2, 0, 2, 5);
77  auto m41 = Hit::Vector4(0, -2, 2, 5);
78  auto h = Hit(gid, pid, p4, m40, m41, 42u);
79 
80  BOOST_CHECK_EQUAL(h.geometryId(), gid);
81  BOOST_CHECK_EQUAL(h.particleId(), pid);
82  BOOST_CHECK_EQUAL(h.index(), 42u);
83  CHECK_CLOSE_REL(h.fourPosition(), p4, eps);
84  CHECK_CLOSE_REL(h.position(), Hit::Vector3(1, 2, 3), eps);
85  CHECK_CLOSE_REL(h.time(), 4, eps);
86  CHECK_CLOSE_OR_SMALL(h.momentum4Before(), m40, eps, eps);
87  CHECK_CLOSE_OR_SMALL(h.momentum4After(), m41, eps, eps);
88  CHECK_CLOSE_OR_SMALL(h.directionBefore(), Hit::Vector3(1, 0, 1).normalized(),
89  eps, eps);
90  CHECK_CLOSE_OR_SMALL(h.directionAfter(), Hit::Vector3(0, -1, 1).normalized(),
91  eps, eps);
92  CHECK_CLOSE_REL(h.direction(), Hit::Vector3(1, -1, 2).normalized(), eps);
93  CHECK_SMALL(h.depositedEnergy(), eps);
94 }
95 
96 BOOST_AUTO_TEST_CASE(WithEverything) {
97  // some hit position
98  auto p4 = Hit::Vector4(1, 2, 3, 4);
99  // before/after four-momenta differ by direction and norm
100  auto m40 = Hit::Vector4(3, 2, 2, 5);
101  auto m41 = Hit::Vector4(2, 1, 2, 4);
102  auto h = Hit(gid, pid, p4, m40, m41, 1u);
103 
104  BOOST_CHECK_EQUAL(h.geometryId(), gid);
105  BOOST_CHECK_EQUAL(h.particleId(), pid);
106  BOOST_CHECK_EQUAL(h.index(), 1u);
107  CHECK_CLOSE_REL(h.fourPosition(), p4, eps);
108  CHECK_CLOSE_REL(h.position(), Hit::Vector3(1, 2, 3), eps);
109  CHECK_CLOSE_REL(h.time(), 4, eps);
110  CHECK_CLOSE_OR_SMALL(h.momentum4Before(), m40, eps, eps);
111  CHECK_CLOSE_OR_SMALL(h.momentum4After(), m41, eps, eps);
112  CHECK_CLOSE_REL(h.directionBefore(), Hit::Vector3(3, 2, 2).normalized(), eps);
113  CHECK_CLOSE_REL(h.directionAfter(), Hit::Vector3(2, 1, 2).normalized(), eps);
115  h.direction(),
116  Hit::Vector3(0.7023994590205035, 0.41229136135810396, 0.5802161953247991),
117  eps);
118  CHECK_CLOSE_REL(h.depositedEnergy(), 1, eps);
119 }
120 
121 BOOST_AUTO_TEST_SUITE_END()