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MaterialPropertiesTests.cpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2017-2018 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 
11 #include <limits>
12 #include <vector>
13 
14 #include "Acts/Material/MaterialProperties.hpp"
15 #include "Acts/Tests/CommonHelpers/FloatComparisons.hpp"
16 
17 static constexpr auto eps = 2 * std::numeric_limits<float>::epsilon();
18 
19 BOOST_AUTO_TEST_SUITE(material_properties)
20 
21 BOOST_AUTO_TEST_CASE(construct_simple) {
22  // construct from separate arguments
23  Acts::MaterialProperties fromArgs(1., 2., 3., 4., 5., 6.);
25  Acts::MaterialProperties fromMaterial(Acts::Material(1., 2., 3., 4., 5.), 6.);
26 
27  CHECK_CLOSE_REL(fromArgs.thickness(), 6., eps);
28  CHECK_CLOSE_REL(fromArgs.thicknessInX0(), 6., eps);
29  CHECK_CLOSE_REL(fromArgs.thicknessInL0(), 3., eps);
30  CHECK_CLOSE_REL(fromMaterial.thickness(), 6., eps);
31  CHECK_CLOSE_REL(fromMaterial.thicknessInX0(), 6., eps);
32  CHECK_CLOSE_REL(fromMaterial.thicknessInL0(), 3., eps);
33  BOOST_TEST(fromArgs.material() == fromMaterial.material());
34  BOOST_TEST(fromArgs == fromMaterial);
35 }
36 
37 static const Acts::MaterialProperties a(1., 2., 3., 4., 5., 1.);
38 static const Acts::MaterialProperties b(2., 4., 6., 8., 10., 2.);
39 static const Acts::MaterialProperties c(4., 8., 12., 16., 20., 3.);
40 static const std::vector<Acts::MaterialProperties> components = {a, b, c};
41 
42 BOOST_AUTO_TEST_CASE(construct_compound) {
43  Acts::MaterialProperties abc(components);
44 
45  // consistency checks
46  CHECK_CLOSE_REL(abc.thickness() / abc.material().X0(), abc.thicknessInX0(),
47  eps);
48  CHECK_CLOSE_REL(abc.thickness() / abc.material().L0(), abc.thicknessInL0(),
49  eps);
50 
51  // absolute and relative thicknesses are additive
52  CHECK_CLOSE_REL(abc.thickness(),
53  a.thickness() + b.thickness() + c.thickness(), eps);
54  CHECK_CLOSE_REL(abc.thicknessInX0(),
55  a.thicknessInX0() + b.thicknessInX0() + c.thicknessInX0(),
56  eps);
57  CHECK_CLOSE_REL(abc.thicknessInL0(),
58  a.thicknessInL0() + b.thicknessInL0() + c.thicknessInL0(),
59  eps);
60  // The density scales with the thickness
61  CHECK_CLOSE_REL(abc.material().massDensity(),
62  (a.thickness() * a.material().massDensity() +
63  b.thickness() * b.material().massDensity() +
64  c.thickness() * c.material().massDensity()) /
65  (a.thickness() + b.thickness() + c.thickness()),
66  eps);
67 }
68 
69 BOOST_AUTO_TEST_CASE(scale_thickness) {
70  Acts::MaterialProperties mat(1., 2., 3., 4., 5., 0.1);
71  Acts::MaterialProperties halfMat(1., 2., 3., 4., 5., 0.05);
72  Acts::MaterialProperties halfScaled = mat;
73  halfScaled.scaleThickness(0.5);
74 
75  BOOST_TEST(mat != halfMat);
76  BOOST_TEST(halfMat == halfScaled);
77  CHECK_CLOSE_REL(mat.thicknessInX0(), 2 * halfMat.thicknessInX0(), eps);
78  CHECK_CLOSE_REL(mat.thicknessInL0(), 2 * halfMat.thicknessInL0(), eps);
79  CHECK_CLOSE_REL(mat.thickness() * mat.material().massDensity(),
80  2. * halfMat.thickness() * halfMat.material().massDensity(),
81  eps);
82 }
83 
84 BOOST_AUTO_TEST_SUITE_END()