chrome/browser/after_startup_task_utils_unittest.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/after_startup_task_utils.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/run_loop.h"
  13 #include "base/task_runner_util.h"
  14 #include "base/thread_task_runner_handle.h"
  15 #include "base/threading/thread.h"
  16 #include "content/public/browser/browser_thread.h"
  17 #include "content/public/test/test_browser_thread_bundle.h"
  18 #include "testing/gtest/include/gtest/gtest.h"
  19
  20 using base::RunLoop;
  21 using content::BrowserThread;
  22 using content::TestBrowserThreadBundle;
  23
  24 namespace {
  25
  26 class WrappedTaskRunner : public base::TaskRunner {
  27  public:
  28   explicit WrappedTaskRunner(const scoped_refptr<TaskRunner>& real_runner)
  29       : real_task_runner_(real_runner) {}
  30
  31   bool PostDelayedTask(const tracked_objects::Location& from_here,
  32                        const base::Closure& task,
  33                        base::TimeDelta delay) override {
  34     ++posted_task_count_;
  35     return real_task_runner_->PostDelayedTask(
  36         from_here, base::Bind(&WrappedTaskRunner::RunWrappedTask, this, task),
  37         base::TimeDelta());  // Squash all delays so our tests complete asap.
  38   }
  39
  40   bool RunsTasksOnCurrentThread() const override {
  41     return real_task_runner_->RunsTasksOnCurrentThread();
  42   }
  43
  44   base::TaskRunner* real_runner() const { return real_task_runner_.get(); }
  45
  46   int total_task_count() const { return posted_task_count_ + ran_task_count_; }
  47   int posted_task_count() const { return posted_task_count_; }
  48   int ran_task_count() const { return ran_task_count_; }
  49
  50   void reset_task_counts() {
  51     posted_task_count_ = 0;
  52     ran_task_count_ = 0;
  53   }
  54
  55  private:
  56   ~WrappedTaskRunner() override {}
  57
  58   void RunWrappedTask(const base::Closure& task) {
  59     ++ran_task_count_;
  60     task.Run();
  61   }
  62
  63   scoped_refptr<TaskRunner> real_task_runner_;
  64   int posted_task_count_ = 0;
  65   int ran_task_count_ = 0;
  66 };
  67
  68 }  // namespace
  69
  70 class AfterStartupTaskTest : public testing::Test {
  71  public:
  72   AfterStartupTaskTest()
  73       : browser_thread_bundle_(TestBrowserThreadBundle::REAL_DB_THREAD) {
  74     ui_thread_ = new WrappedTaskRunner(
  75         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI));
  76     db_thread_ = new WrappedTaskRunner(
  77         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB));
  78     AfterStartupTaskUtils::UnsafeResetForTesting();
  79   }
  80
  81   // Hop to the db thread and call IsBrowserStartupComplete.
  82   bool GetIsBrowserStartupCompleteFromDBThread() {
  83     RunLoop run_loop;
  84     bool is_complete;
  85     base::PostTaskAndReplyWithResult(
  86         db_thread_->real_runner(), FROM_HERE,
  87         base::Bind(&AfterStartupTaskUtils::IsBrowserStartupComplete),
  88         base::Bind(&AfterStartupTaskTest::GotIsOnBrowserStartupComplete,
  89                    &run_loop, &is_complete));
  90     run_loop.Run();
  91     return is_complete;
  92   }
  93
  94   // Hop to the db thread and call PostAfterStartupTask.
  95   void PostAfterStartupTaskFromDBThread(
  96       const tracked_objects::Location& from_here,
  97       const scoped_refptr<base::TaskRunner>& task_runner,
  98       const base::Closure& task) {
  99     RunLoop run_loop;
 100     db_thread_->real_runner()->PostTaskAndReply(
 101         FROM_HERE, base::Bind(&AfterStartupTaskUtils::PostTask, from_here,
 102                               task_runner, task),
 103         base::Bind(&RunLoop::Quit, base::Unretained(&run_loop)));
 104     run_loop.Run();
 105   }
 106
 107   // Make sure all tasks posted to the DB thread get run.
 108   void FlushDBThread() {
 109     RunLoop run_loop;
 110     db_thread_->real_runner()->PostTaskAndReply(
 111         FROM_HERE, base::Bind(&base::DoNothing),
 112         base::Bind(&RunLoop::Quit, base::Unretained(&run_loop)));
 113     run_loop.Run();
 114   }
 115
 116   static void VerifyExpectedThread(BrowserThread::ID id) {
 117     EXPECT_TRUE(BrowserThread::CurrentlyOn(id));
 118   }
 119
 120  protected:
 121   scoped_refptr<WrappedTaskRunner> ui_thread_;
 122   scoped_refptr<WrappedTaskRunner> db_thread_;
 123
 124  private:
 125   static void GotIsOnBrowserStartupComplete(RunLoop* loop,
 126                                             bool* out,
 127                                             bool is_complete) {
 128     *out = is_complete;
 129     loop->Quit();
 130   }
 131
 132   TestBrowserThreadBundle browser_thread_bundle_;
 133 };
 134
 135 TEST_F(AfterStartupTaskTest, IsStartupComplete) {
 136   // Check IsBrowserStartupComplete on a background thread first to
 137   // verify that it does not allocate the underlying flag on that thread.
 138   // That allocation thread correctness part of this test relies on
 139   // the DCHECK in CancellationFlag::Set().
 140   EXPECT_FALSE(GetIsBrowserStartupCompleteFromDBThread());
 141   EXPECT_FALSE(AfterStartupTaskUtils::IsBrowserStartupComplete());
 142   AfterStartupTaskUtils::SetBrowserStartupIsComplete();
 143   EXPECT_TRUE(AfterStartupTaskUtils::IsBrowserStartupComplete());
 144   EXPECT_TRUE(GetIsBrowserStartupCompleteFromDBThread());
 145 }
 146
 147 TEST_F(AfterStartupTaskTest, PostTask) {
 148   // Nothing should be posted prior to startup completion.
 149   EXPECT_FALSE(AfterStartupTaskUtils::IsBrowserStartupComplete());
 150   AfterStartupTaskUtils::PostTask(
 151       FROM_HERE, ui_thread_,
 152       base::Bind(&AfterStartupTaskTest::VerifyExpectedThread,
 153                  BrowserThread::UI));
 154   AfterStartupTaskUtils::PostTask(
 155       FROM_HERE, db_thread_,
 156       base::Bind(&AfterStartupTaskTest::VerifyExpectedThread,
 157                  BrowserThread::DB));
 158   PostAfterStartupTaskFromDBThread(
 159       FROM_HERE, ui_thread_,
 160       base::Bind(&AfterStartupTaskTest::VerifyExpectedThread,
 161                  BrowserThread::UI));
 162   PostAfterStartupTaskFromDBThread(
 163       FROM_HERE, db_thread_,
 164       base::Bind(&AfterStartupTaskTest::VerifyExpectedThread,
 165                  BrowserThread::DB));
 166   RunLoop().RunUntilIdle();
 167   EXPECT_EQ(0, db_thread_->total_task_count() + ui_thread_->total_task_count());
 168
 169   // Queued tasks should be posted upon setting the flag.
 170   AfterStartupTaskUtils::SetBrowserStartupIsComplete();
 171   EXPECT_EQ(2, db_thread_->posted_task_count());
 172   EXPECT_EQ(2, ui_thread_->posted_task_count());
 173   FlushDBThread();
 174   RunLoop().RunUntilIdle();
 175   EXPECT_EQ(2, db_thread_->ran_task_count());
 176   EXPECT_EQ(2, ui_thread_->ran_task_count());
 177
 178   db_thread_->reset_task_counts();
 179   ui_thread_->reset_task_counts();
 180   EXPECT_EQ(0, db_thread_->total_task_count() + ui_thread_->total_task_count());
 181
 182   // Tasks posted after startup should get posted immediately.
 183   AfterStartupTaskUtils::PostTask(FROM_HERE, ui_thread_,
 184                                   base::Bind(&base::DoNothing));
 185   AfterStartupTaskUtils::PostTask(FROM_HERE, db_thread_,
 186                                   base::Bind(&base::DoNothing));
 187   EXPECT_EQ(1, db_thread_->posted_task_count());
 188   EXPECT_EQ(1, ui_thread_->posted_task_count());
 189   PostAfterStartupTaskFromDBThread(FROM_HERE, ui_thread_,
 190                                    base::Bind(&base::DoNothing));
 191   PostAfterStartupTaskFromDBThread(FROM_HERE, db_thread_,
 192                                    base::Bind(&base::DoNothing));
 193   EXPECT_EQ(2, db_thread_->posted_task_count());
 194   EXPECT_EQ(2, ui_thread_->posted_task_count());
 195   FlushDBThread();
 196   RunLoop().RunUntilIdle();
 197   EXPECT_EQ(2, db_thread_->ran_task_count());
 198   EXPECT_EQ(2, ui_thread_->ran_task_count());
 199 }