Prioritizing input and compositor tasks in the blink scheduler.

Source/platform/scheduler/DoubleBufferedDequeTest.cpp

+// Copyright 2014 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 "config.h"
+#include "platform/scheduler/DoubleBufferedDeque.h"
+
+#include <gtest/gtest.h>
+
+namespace {
+
+using blink::DoubleBufferedDeque;
+
+typedef testing::Test DoubleBufferedDequeTest;
+
+TEST(DoubleBufferedDequeTest, TestIsEmpty)
+{
+    DoubleBufferedDeque<int> queue;
+
+    EXPECT_TRUE(queue.isEmpty());
+    queue.append(1);
+    EXPECT_FALSE(queue.isEmpty());
+}
+
+TEST(DoubleBufferedDequeTest, TestIsEmptyAfterSwapBuffers)
+{
+    DoubleBufferedDeque<int> queue;
+    queue.append(1);
+
+    queue.swapBuffers();
+    EXPECT_TRUE(queue.isEmpty());
+
+    queue.swapBuffers();
+    EXPECT_FALSE(queue.isEmpty());
+}
+
+TEST(DoubleBufferedDequeTest, TestDoubleBuffering)
+{
+    DoubleBufferedDeque<int> queue;
+    queue.append(1);
+
+    queue.append(2);
+    EXPECT_EQ(1, queue.swapBuffers().takeFirst());
+
+    queue.append(3);
+    EXPECT_EQ(2, queue.swapBuffers().takeFirst());
+
+    queue.append(4);
+    EXPECT_EQ(3, queue.swapBuffers().takeFirst());
+}
+
+} // namespace