1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
// 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. Caveat: delayed tasks are not run,
// they're simply deleted.
// void StopTaskRunner() {
// ...
// }
// };
//
// 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_TEST_TASK_RUNNER_TEST_TEMPLATE_H_
#define BASE_TEST_TASK_RUNNER_TEST_TEMPLATE_H_
#include <cstddef>
#include <map>
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/condition_variable.h"
#include "base/synchronization/lock.h"
#include "base/task_runner.h"
#include "base/threading/thread.h"
#include "base/tracked_objects.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace internal {
// Utility class that keeps track of how many times particular tasks
// are run.
class TaskTracker : public RefCountedThreadSafe<TaskTracker> {
public:
TaskTracker();
// Returns a closure that runs the given task and increments the run
// count of |i| by one. |task| may be null. It is guaranteed that
// only one task wrapped by a given tracker will be run at a time.
Closure WrapTask(const Closure& task, int i);
std::map<int, int> GetTaskRunCounts() const;
// Returns after the tracker observes a total of |count| task completions.
void WaitForCompletedTasks(int count);
private:
friend class RefCountedThreadSafe<TaskTracker>;
~TaskTracker();
void RunTask(const Closure& task, int i);
mutable Lock lock_;
std::map<int, int> task_run_counts_;
int task_runs_;
ConditionVariable task_runs_cv_;
DISALLOW_COPY_AND_ASSIGN(TaskTracker);
};
} // namespace internal
template <typename TaskRunnerTestDelegate>
class TaskRunnerTest : public testing::Test {
protected:
TaskRunnerTest() : task_tracker_(new internal::TaskTracker()) {}
const scoped_refptr<internal::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) {
const Closure& ith_task = this->task_tracker_->WrapTask(Closure(), i);
for (int j = 0; j < i + 1; ++j) {
task_runner->PostTask(FROM_HERE, ith_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) {
std::map<int, int> expected_task_run_counts;
int expected_total_tasks = 0;
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) {
const Closure& ith_task = this->task_tracker_->WrapTask(Closure(), i);
for (int j = 0; j < i + 1; ++j) {
task_runner->PostDelayedTask(
FROM_HERE, ith_task, base::TimeDelta::FromMilliseconds(j));
++expected_task_run_counts[i];
++expected_total_tasks;
}
}
this->task_tracker_->WaitForCompletedTasks(expected_total_tasks);
this->delegate_.StopTaskRunner();
EXPECT_EQ(expected_task_run_counts,
this->task_tracker_->GetTaskRunCounts());
}
namespace internal {
// Calls RunsTasksOnCurrentThread() on |task_runner| and expects it to
// equal |expected_value|.
void ExpectRunsTasksOnCurrentThread(
bool expected_value,
const scoped_refptr<TaskRunner>& task_runner);
} // namespace internal
// Post a bunch of tasks to the task runner as well as to a separate
// thread, each checking the value of RunsTasksOnCurrentThread(),
// which should return true for the tasks posted on the task runner
// and false for the tasks posted on the separate thread.
TYPED_TEST_P(TaskRunnerTest, RunsTasksOnCurrentThread) {
std::map<int, int> expected_task_run_counts;
Thread thread("Non-task-runner thread");
ASSERT_TRUE(thread.Start());
this->delegate_.StartTaskRunner();
scoped_refptr<TaskRunner> task_runner = this->delegate_.GetTaskRunner();
// Post each ith task i+1 times on the task runner and i+1 times on
// the non-task-runner thread.
for (int i = 0; i < 20; ++i) {
const Closure& ith_task_runner_task =
this->task_tracker_->WrapTask(
Bind(&internal::ExpectRunsTasksOnCurrentThread,
true, task_runner),
i);
const Closure& ith_non_task_runner_task =
this->task_tracker_->WrapTask(
Bind(&internal::ExpectRunsTasksOnCurrentThread,
false, task_runner),
i);
for (int j = 0; j < i + 1; ++j) {
task_runner->PostTask(FROM_HERE, ith_task_runner_task);
thread.message_loop()->PostTask(FROM_HERE, ith_non_task_runner_task);
expected_task_run_counts[i] += 2;
}
}
this->delegate_.StopTaskRunner();
thread.Stop();
EXPECT_EQ(expected_task_run_counts,
this->task_tracker_->GetTaskRunCounts());
}
REGISTER_TYPED_TEST_CASE_P(
TaskRunnerTest, Basic, Delayed, RunsTasksOnCurrentThread);
} // namespace base
#endif //#define BASE_TEST_TASK_RUNNER_TEST_TEMPLATE_H_
|
