xref: /third_party/json/tests/src/unit-hash.cpp (revision c5f01b2f) 
1//     __ _____ _____ _____
2//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
3// |  |  |__   |  |  | | | |  version 3.11.2
4// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
5//
6// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
7// SPDX-License-Identifier: MIT
8
9#include "doctest_compatibility.h"
10
11#include <nlohmann/json.hpp>
12using json = nlohmann::json;
13using ordered_json = nlohmann::ordered_json;
14
15#include <set>
16
17TEST_CASE("hash<nlohmann::json>")
18{
19    // Collect hashes for different JSON values and make sure that they are distinct
20    // We cannot compare against fixed values, because the implementation of
21    // std::hash may differ between compilers.
22
23    std::set<std::size_t> hashes;
24
25    // null
26    hashes.insert(std::hash<json> {}(json(nullptr)));
27
28    // boolean
29    hashes.insert(std::hash<json> {}(json(true)));
30    hashes.insert(std::hash<json> {}(json(false)));
31
32    // string
33    hashes.insert(std::hash<json> {}(json("")));
34    hashes.insert(std::hash<json> {}(json("foo")));
35
36    // number
37    hashes.insert(std::hash<json> {}(json(0)));
38    hashes.insert(std::hash<json> {}(json(static_cast<unsigned>(0))));
39
40    hashes.insert(std::hash<json> {}(json(-1)));
41    hashes.insert(std::hash<json> {}(json(0.0)));
42    hashes.insert(std::hash<json> {}(json(42.23)));
43
44    // array
45    hashes.insert(std::hash<json> {}(json::array()));
46    hashes.insert(std::hash<json> {}(json::array({1, 2, 3})));
47
48    // object
49    hashes.insert(std::hash<json> {}(json::object()));
50    hashes.insert(std::hash<json> {}(json::object({{"foo", "bar"}})));
51
52    // binary
53    hashes.insert(std::hash<json> {}(json::binary({})));
54    hashes.insert(std::hash<json> {}(json::binary({}, 0)));
55    hashes.insert(std::hash<json> {}(json::binary({}, 42)));
56    hashes.insert(std::hash<json> {}(json::binary({1, 2, 3})));
57    hashes.insert(std::hash<json> {}(json::binary({1, 2, 3}, 0)));
58    hashes.insert(std::hash<json> {}(json::binary({1, 2, 3}, 42)));
59
60    // discarded
61    hashes.insert(std::hash<json> {}(json(json::value_t::discarded)));
62
63    CHECK(hashes.size() == 21);
64}
65
66TEST_CASE("hash<nlohmann::ordered_json>")
67{
68    // Collect hashes for different JSON values and make sure that they are distinct
69    // We cannot compare against fixed values, because the implementation of
70    // std::hash may differ between compilers.
71
72    std::set<std::size_t> hashes;
73
74    // null
75    hashes.insert(std::hash<ordered_json> {}(ordered_json(nullptr)));
76
77    // boolean
78    hashes.insert(std::hash<ordered_json> {}(ordered_json(true)));
79    hashes.insert(std::hash<ordered_json> {}(ordered_json(false)));
80
81    // string
82    hashes.insert(std::hash<ordered_json> {}(ordered_json("")));
83    hashes.insert(std::hash<ordered_json> {}(ordered_json("foo")));
84
85    // number
86    hashes.insert(std::hash<ordered_json> {}(ordered_json(0)));
87    hashes.insert(std::hash<ordered_json> {}(ordered_json(static_cast<unsigned>(0))));
88
89    hashes.insert(std::hash<ordered_json> {}(ordered_json(-1)));
90    hashes.insert(std::hash<ordered_json> {}(ordered_json(0.0)));
91    hashes.insert(std::hash<ordered_json> {}(ordered_json(42.23)));
92
93    // array
94    hashes.insert(std::hash<ordered_json> {}(ordered_json::array()));
95    hashes.insert(std::hash<ordered_json> {}(ordered_json::array({1, 2, 3})));
96
97    // object
98    hashes.insert(std::hash<ordered_json> {}(ordered_json::object()));
99    hashes.insert(std::hash<ordered_json> {}(ordered_json::object({{"foo", "bar"}})));
100
101    // binary
102    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({})));
103    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({}, 0)));
104    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({}, 42)));
105    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({1, 2, 3})));
106    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({1, 2, 3}, 0)));
107    hashes.insert(std::hash<ordered_json> {}(ordered_json::binary({1, 2, 3}, 42)));
108
109    // discarded
110    hashes.insert(std::hash<ordered_json> {}(ordered_json(ordered_json::value_t::discarded)));
111
112    CHECK(hashes.size() == 21);
113}
114