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+// Copyright 2018 The Abseil 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 "absl/base/internal/atomic_hook.h"
+
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+
+namespace {
+
+int value = 0;
+void TestHook(int x) { value = x; }
+
+TEST(AtomicHookTest, NoDefaultFunction) {
+ ABSL_CONST_INIT static absl::base_internal::AtomicHook<void(*)(int)> hook;
+ value = 0;
+
+ // Test the default DummyFunction.
+ EXPECT_TRUE(hook.Load() == nullptr);
+ EXPECT_EQ(value, 0);
+ hook(1);
+ EXPECT_EQ(value, 0);
+
+ // Test a stored hook.
+ hook.Store(TestHook);
+ EXPECT_TRUE(hook.Load() == TestHook);
+ EXPECT_EQ(value, 0);
+ hook(1);
+ EXPECT_EQ(value, 1);
+
+ // Calling Store() with the same hook should not crash.
+ hook.Store(TestHook);
+ EXPECT_TRUE(hook.Load() == TestHook);
+ EXPECT_EQ(value, 1);
+ hook(2);
+ EXPECT_EQ(value, 2);
+}
+
+TEST(AtomicHookTest, WithDefaultFunction) {
+ // Set the default value to TestHook at compile-time.
+ ABSL_CONST_INIT static absl::base_internal::AtomicHook<void (*)(int)> hook(
+ TestHook);
+ value = 0;
+
+ // Test the default value is TestHook.
+ EXPECT_TRUE(hook.Load() == TestHook);
+ EXPECT_EQ(value, 0);
+ hook(1);
+ EXPECT_EQ(value, 1);
+
+ // Calling Store() with the same hook should not crash.
+ hook.Store(TestHook);
+ EXPECT_TRUE(hook.Load() == TestHook);
+ EXPECT_EQ(value, 1);
+ hook(2);
+ EXPECT_EQ(value, 2);
+}
+
+} // namespace