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// Copyright (c) 2012 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.
// This class defines tests that implementations of TaskRunner should
// pass in order to be conformant. Here's how you use it to test your
// implementation.
//
// Say your class is called MyTaskRunner. Then you need to define a
// class called MyTaskRunnerTestDelegate in my_task_runner_unittest.cc
// like this:
//
// class MyTaskRunnerTestDelegate {
// public:
// // Tasks posted to the task runner after this and before
// // StopTaskRunner() is called is called should run successfully.
// void StartTaskRunner() {
// ...
// }
//
// // Should return the task runner implementation. Only called
// // after StartTaskRunner and before StopTaskRunner.
// scoped_refptr<MyTaskRunner> GetTaskRunner() {
// ...
// }
//
// // Stop the task runner and make sure all tasks posted before
// // this is called are run.
// void StopTaskRunner() {
// ...
// }
//
// // Returns whether or not the task runner obeys non-zero delays.
// bool TaskRunnerHandlesNonZeroDelays() const {
// return true;
// }
// };
//
// The TaskRunnerTest test harness will have a member variable of
// this delegate type and will call its functions in the various
// tests.
//
// Then you simply #include this file as well as gtest.h and add the
// following statement to my_task_runner_unittest.cc:
//
// INSTANTIATE_TYPED_TEST_CASE_P(
// MyTaskRunner, TaskRunnerTest, MyTaskRunnerTestDelegate);
//
// Easy!
#ifndef BASE_TASK_RUNNER_TEST_TEMPLATE_H_
#define BASE_TASK_RUNNER_TEST_TEMPLATE_H_
#pragma once
#include <cstddef>
#include <map>
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/task_runner.h"
#include "base/tracked_objects.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
// Utility class used in the tests below.
class TaskTracker : public RefCountedThreadSafe<TaskTracker> {
public:
TaskTracker();
void RunTask(int i);
std::map<int, int> GetTaskRunCounts() const;
private:
friend class RefCountedThreadSafe<TaskTracker>;
~TaskTracker();
mutable Lock task_run_counts_lock_;
std::map<int, int> task_run_counts_;
DISALLOW_COPY_AND_ASSIGN(TaskTracker);
};
template <typename TaskRunnerTestDelegate>
class TaskRunnerTest : public testing::Test {
protected:
TaskRunnerTest() : task_tracker_(new TaskTracker()) {}
const scoped_refptr<TaskTracker> task_tracker_;
TaskRunnerTestDelegate delegate_;
};
TYPED_TEST_CASE_P(TaskRunnerTest);
// We can't really test much, since TaskRunner provides very few
// guarantees.
// Post a bunch of tasks to the task runner. They should all
// complete.
TYPED_TEST_P(TaskRunnerTest, Basic) {
std::map<int, int> expected_task_run_counts;
this->delegate_.StartTaskRunner();
scoped_refptr<TaskRunner> task_runner = this->delegate_.GetTaskRunner();
// Post each ith task i+1 times.
for (int i = 0; i < 20; ++i) {
Closure task = Bind(&TaskTracker::RunTask, this->task_tracker_, i);
for (int j = 0; j < i + 1; ++j) {
task_runner->PostTask(FROM_HERE, task);
++expected_task_run_counts[i];
}
}
this->delegate_.StopTaskRunner();
EXPECT_EQ(expected_task_run_counts,
this->task_tracker_->GetTaskRunCounts());
}
// Post a bunch of delayed tasks to the task runner. They should all
// complete.
TYPED_TEST_P(TaskRunnerTest, Delayed) {
if (!this->delegate_.TaskRunnerHandlesNonZeroDelays()) {
DLOG(INFO) << "This TaskRunner doesn't handle non-zero delays; skipping";
return;
}
std::map<int, int> expected_task_run_counts;
this->delegate_.StartTaskRunner();
scoped_refptr<TaskRunner> task_runner = this->delegate_.GetTaskRunner();
// Post each ith task i+1 times with delays from 0-i.
for (int i = 0; i < 20; ++i) {
Closure task = Bind(&TaskTracker::RunTask, this->task_tracker_, i);
for (int j = 0; j < i + 1; ++j) {
task_runner->PostDelayedTask(FROM_HERE, task, j);
++expected_task_run_counts[i];
}
}
this->delegate_.StopTaskRunner();
EXPECT_EQ(expected_task_run_counts,
this->task_tracker_->GetTaskRunCounts());
}
// TODO(akalin): Add test to verify RunsTaskOnCurrentThread() returns
// true for tasks runs on the TaskRunner and returns false on a
// separate PlatformThread.
REGISTER_TYPED_TEST_CASE_P(TaskRunnerTest, Basic, Delayed);
} // namespace base
#endif //#define BASE_TASK_RUNNER_TEST_TEMPLATE_H_
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