no_destruct_test.cc

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// Copyright 2022 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#include "src/core/lib/gprpp/no_destruct.h"
 
#include <stdlib.h>
 
#include <memory>
 
#include <gtest/gtest.h>
 
namespace grpc_core {
namespace testing {
namespace {
 
class CrashOnDestruction {
 public:
  void Exists() {}
 
 private:
  ~CrashOnDestruction() { abort(); }
};
 
NoDestruct<std::unique_ptr<int>> g_test_int(new int(42));
NoDestruct<CrashOnDestruction> g_test_crash_on_destruction;
 
TEST(NoDestruct, Works) { EXPECT_EQ(42, **g_test_int); }
 
TEST(NoDestruct, CrashOnDestructionIsAccessible) {
  g_test_crash_on_destruction->Exists();
}
 
bool g_thing_constructed = false;
 
class Thing {
 public:
  Thing() {
    EXPECT_FALSE(g_thing_constructed);
    g_thing_constructed = true;
  }
 
  int Add(int i, int j) { return i + j; }
 
 private:
  ~Thing() = delete;
};
 
TEST(GlobalSingleton, Works) {
  // Thing should be eagerly constructed, so we should not observe it being not
  // constructed.
  EXPECT_TRUE(g_thing_constructed);
  // We should be able to fetch the global Thing and use it.
  EXPECT_EQ(NoDestructSingleton<Thing>::Get()->Add(1, 2), 3);
}
 
}  // namespace
}  // namespace testing
}  // namespace grpc_core
 
int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}