1 // Copyright 2022 gRPC authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "src/core/lib/gprpp/no_destruct.h"
16
17 #include <stdlib.h>
18
19 #include <memory>
20
21 #include "gtest/gtest.h"
22
23 namespace grpc_core {
24 namespace testing {
25 namespace {
26
27 class CrashOnDestruction {
28 public:
Exists()29 void Exists() {}
30
31 private:
~CrashOnDestruction()32 ~CrashOnDestruction() { abort(); }
33 };
34
35 NoDestruct<std::unique_ptr<int>> g_test_int(new int(42));
36 NoDestruct<CrashOnDestruction> g_test_crash_on_destruction;
37
TEST(NoDestruct,Works)38 TEST(NoDestruct, Works) { EXPECT_EQ(42, **g_test_int); }
39
TEST(NoDestruct,CrashOnDestructionIsAccessible)40 TEST(NoDestruct, CrashOnDestructionIsAccessible) {
41 g_test_crash_on_destruction->Exists();
42 }
43
44 bool g_thing_constructed = false;
45
46 class Thing {
47 public:
Thing()48 Thing() {
49 EXPECT_FALSE(g_thing_constructed);
50 g_thing_constructed = true;
51 }
52
Add(int i,int j)53 int Add(int i, int j) { return i + j; }
54
55 private:
56 ~Thing() = delete;
57 };
58
TEST(GlobalSingleton,Works)59 TEST(GlobalSingleton, Works) {
60 // Thing should be eagerly constructed, so we should not observe it being not
61 // constructed.
62 EXPECT_TRUE(g_thing_constructed);
63 // We should be able to fetch the global Thing and use it.
64 EXPECT_EQ(NoDestructSingleton<Thing>::Get()->Add(1, 2), 3);
65 }
66
67 } // namespace
68 } // namespace testing
69 } // namespace grpc_core
70
main(int argc,char ** argv)71 int main(int argc, char** argv) {
72 ::testing::InitGoogleTest(&argc, argv);
73 return RUN_ALL_TESTS();
74 }
75