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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/debug/task_trace.h"
#include <ostream>
#include "base/run_loop.h"
#include "base/test/bind.h"
#include "base/test/task_environment.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace debug {
TEST(TaskTraceTest, NoTask) {
TaskTrace task_trace;
EXPECT_TRUE(task_trace.empty());
EXPECT_EQ(task_trace.AddressesForTesting().size(), 0ul);
}
class ThreeTasksTest {
public:
ThreeTasksTest() {}
void Run() {
task_runner.PostTask(FROM_HERE, base::BindOnce(&ThreeTasksTest::TaskA,
base::Unretained(this)));
task_environment.RunUntilIdle();
}
void TaskA() {
TaskTrace task_trace;
EXPECT_FALSE(task_trace.empty());
base::span<const void* const> addresses = task_trace.AddressesForTesting();
EXPECT_EQ(addresses.size(), 1ul);
task_a_address = addresses[0];
task_runner.PostTask(FROM_HERE, base::BindOnce(&ThreeTasksTest::TaskB,
base::Unretained(this)));
}
void TaskB() {
TaskTrace task_trace;
EXPECT_FALSE(task_trace.empty());
base::span<const void* const> addresses = task_trace.AddressesForTesting();
EXPECT_EQ(addresses.size(), 2ul);
task_b_address = addresses[0];
EXPECT_EQ(addresses[1], task_a_address);
task_runner.PostTask(FROM_HERE, base::BindOnce(&ThreeTasksTest::TaskC,
base::Unretained(this)));
}
void TaskC() {
TaskTrace task_trace;
EXPECT_FALSE(task_trace.empty());
base::span<const void* const> addresses = task_trace.AddressesForTesting();
EXPECT_EQ(addresses.size(), 3ul);
EXPECT_EQ(addresses[1], task_b_address);
EXPECT_EQ(addresses[2], task_a_address);
}
private:
base::test::TaskEnvironment task_environment;
base::SingleThreadTaskRunner& task_runner =
*task_environment.GetMainThreadTaskRunner();
const void* task_a_address = nullptr;
const void* task_b_address = nullptr;
};
TEST(TaskTraceTest, ThreeTasks) {
ThreeTasksTest().Run();
}
} // namespace debug
} // namespace base
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