TaskScheduler [6] SchedulerWorkerThread

base/task_scheduler/utils_unittest.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.

[gab, 2016/03/21 19:11:54]

TODO(gab): Review this file.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/task_scheduler/utils.h"
+
+#include <utility>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/task_scheduler/priority_queue.h"
+#include "base/task_scheduler/sequence.h"
+#include "base/task_scheduler/task.h"
+#include "base/task_scheduler/task_tracker.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace internal {
+
+// Checks that when PostTaskHelper is called with an empty sequence, the task
+// is added to the sequence and the sequence is added to the priority queue.
+TEST(TaskSchedulerUtilsTest, PostTaskNowHelperEmptySequence) {
+  scoped_ptr<Task> task(new Task(FROM_HERE, Bind(&DoNothing), TaskTraits()));
+  const Task* task_raw = task.get();
+  scoped_refptr<Sequence> sequence(new Sequence);
+  PriorityQueue priority_queue(Bind(&DoNothing));
+  TaskTracker task_tracker;
+
+  // Post a task.

[gab, 2016/03/21 19:11:54]

s/a/the/

[fdoray, 2016/03/24 19:21:09]

Done.

+  PostTaskHelper(std::move(task), sequence, &priority_queue, &task_tracker);
+
+  // Expect to find the sequence in the priority queue.
+  EXPECT_EQ(sequence, priority_queue.BeginTransaction()->Peek().sequence);
+
+  // Expect to find the task in the sequence.

[gab, 2016/03/21 19:11:53]

// Expect to find the task alone in the sequence.
                             ^^

(i.e. to highlight why you're testing a PopTask() after)

[fdoray, 2016/03/24 19:21:09]

Done.

+  EXPECT_EQ(task_raw, sequence->PeekTask());
+  sequence->PopTask();
+  EXPECT_EQ(nullptr, sequence->PeekTask());
+}
+
+// Checks that when PostTaskHelper is called with a sequence that already
+// contains a task, the task is added to the sequence but the sequence is not
+// added to the priority queue.
+TEST(TaskSchedulerUtilsTest, PostTaskNowHelperSequenceWithTasks) {
+  scoped_ptr<Task> task(new Task(FROM_HERE, Bind(&DoNothing), TaskTraits()));
+  const Task* task_raw = task.get();
+  scoped_refptr<Sequence> sequence(new Sequence);
+  PriorityQueue priority_queue(Bind(&DoNothing));
+  TaskTracker task_tracker;
+
+  // Add an initial task in |sequence|.
+  sequence->PushTask(
+      make_scoped_ptr(new Task(FROM_HERE, Bind(&DoNothing), TaskTraits())));
+
+  // Post a task.
+  PostTaskHelper(std::move(task), sequence, &priority_queue, &task_tracker);
+
+  // Expect to find the priority queue empty.
+  EXPECT_TRUE(priority_queue.BeginTransaction()->Peek().is_null());
+
+  // Expect to find the task in the sequence.

[gab, 2016/03/21 19:11:54]

// Expect to find the task in the sequence behind the initial task.

[fdoray, 2016/03/24 19:21:09]

Done.

+  sequence->PopTask();

[gab, 2016/03/21 19:11:54]

EXPECT_NE(task_raw, sequence->PeekTask());

before first pop.

[fdoray, 2016/03/24 19:21:09]

Done.

+  EXPECT_EQ(task_raw, sequence->PeekTask());
+  sequence->PopTask();
+  EXPECT_EQ(nullptr, sequence->PeekTask());
+}
+
+}  // namespace internal
+}  // namespace base