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juce_Enumerate_test.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25
26 class EnumerateUnitTest : public UnitTest
27{
28 public:
29 EnumerateUnitTest() : UnitTest ("Enumerate", UnitTestCategories::containers) {}
30
31 void runTest() override
32 {
33 beginTest ("enumeration works for bidirectional iterators");
34 {
35 const std::list<int> elements { 10, 20, 30, 40, 50 };
36 std::vector<int> counts;
37
38 for (const auto pair : enumerate (elements))
39 counts.push_back ((int) pair.index);
40
41 expect (counts == std::vector<int> { 0, 1, 2, 3, 4 });
42 }
43
44 beginTest ("enumeration works for random-access iterators");
45 {
46 const std::vector<std::string> strings { "a", "bb", "ccc", "dddd", "eeeee" };
47
48 std::vector<int> counts;
49
50 for (const auto [count, element] : enumerate (strings))
51 counts.push_back ((int) ((size_t) count + element.size()));
52
53 expect (counts == std::vector<int> { 1, 3, 5, 7, 9 });
54 }
55
56 beginTest ("enumeration works for mutable ranges");
57 {
58 std::vector<std::string> strings { "", "", "", "", "" };
59
60 for (const auto [count, element] : enumerate (strings))
61 element = std::to_string (count);
62
63 expect (strings == std::vector<std::string> { "0", "1", "2", "3", "4" });
64 }
65
66 beginTest ("iterator can be incremented by more than one");
67 {
68 std::vector<int> ints (6);
69
70 const auto enumerated = enumerate (ints);
71
72 std::vector<int> counts;
73
74 for (auto b = enumerated.begin(), e = enumerated.end(); b != e; b += 2)
75 counts.push_back ((int) (*b).index);
76
77 expect (counts == std::vector<int> { 0, 2, 4 });
78 }
79
80 beginTest ("iterator can be started at a non-zero value");
81 {
82 const std::vector<int> ints (6);
83
84 std::vector<int> counts;
85
86 for (const auto enumerated : enumerate (ints, 5))
87 counts.push_back ((int) enumerated.index);
88
89 expect (counts == std::vector<int> { 5, 6, 7, 8, 9, 10 });
90 }
91
92 beginTest ("subtracting two EnumerateIterators returns the difference between the base iterators");
93 {
94 const std::vector<int> ints (6);
95 const auto enumerated = enumerate (ints);
96 expect ((int) (enumerated.end() - enumerated.begin()) == (int) ints.size());
97 }
98
99 beginTest ("EnumerateIterator can be decremented");
100 {
101 const std::vector<int> ints (5);
102 std::vector<int> counts;
103
104 const auto enumerated = enumerate (std::as_const (ints));
105
106 for (auto i = enumerated.end(), b = enumerated.begin(); i != b; --i)
107 counts.push_back ((int) (*(i - 1)).index);
108
109 expect (counts == std::vector<int> { -1, -2, -3, -4, -5 });
110 }
111
112 beginTest ("EnumerateIterator can be compared");
113 {
114 const std::vector<int> ints (6);
115 const auto enumerated = enumerate (ints);
116 expect (enumerated.begin() < enumerated.end());
117 expect (enumerated.begin() <= enumerated.end());
118 expect (enumerated.end() > enumerated.begin());
119 expect (enumerated.end() >= enumerated.begin());
120 }
121 }
122};
123
124 static EnumerateUnitTest enumerateUnitTest;
125
126} // namespace juce
juce::UnitTest::UnitTest
UnitTest(const String &name, const String &category=String())
Definition juce_UnitTest.cpp:26
juce::UnitTest::beginTest
void beginTest(const String &testName)
Definition juce_UnitTest.cpp:89
juce::UnitTest::expect
void expect(bool testResult, const String &failureMessage=String())
Definition juce_UnitTest.cpp:97