First step to move common accessibility code out of content.

ui/accessibility/ax_tree_unittest.cc

+// Copyright (c) 2013 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 "base/memory/scoped_ptr.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/accessibility/ax_node.h"
+#include "ui/accessibility/ax_serializable_tree.h"
+#include "ui/accessibility/ax_tree.h"
+#include "ui/accessibility/ax_tree_serializer.h"
+
+namespace ui {
+
+TEST(AXTreeTest, TestSerialize) {

[aboxhall, 2013/11/18 21:57:10]

It'd be nice to have a test for the update case as well.

[dmazzoni, 2013/11/19 17:13:54]

I have a more comprehensive unit test already written and
coming in the next changelist! I left it out to keep this
change from getting too large, I want to focus on the
interface here and not the algorithm.

+  AXNodeData root;
+  root.id = 1;
+  root.role = AX_ROLE_ROOT_WEB_AREA;
+  root.child_ids.push_back(2);
+  root.child_ids.push_back(3);
+
+  AXNodeData button;
+  button.id = 2;
+  button.role = AX_ROLE_BUTTON;
+  button.state = 0;
+
+  AXNodeData checkbox;
+  checkbox.id = 3;
+  checkbox.role = AX_ROLE_CHECK_BOX;
+
+  AXTreeUpdate initial_state;
+  initial_state.nodes.push_back(root);
+  initial_state.nodes.push_back(button);
+  initial_state.nodes.push_back(checkbox);
+  AXSerializableTree src_tree(initial_state);
+
+  scoped_ptr<AXTreeSource<AXNode> > tree_source(
+      src_tree.CreateTreeSource());
+  AXTreeSerializer<AXNode> serializer(tree_source.get());
+  AXTreeUpdate update;
+  serializer.SerializeChanges(src_tree.GetRoot(), &update);
+
+  AXTree dst_tree;
+  ASSERT_TRUE(dst_tree.Unserialize(update));
+
+  AXNode* root_node = dst_tree.GetRoot();
+  ASSERT_TRUE(root_node != NULL);
+  EXPECT_EQ(root.id, root_node->id());
+  EXPECT_EQ(root.role, root_node->data().role);
+
+  ASSERT_EQ(2, root_node->child_count());
+
+  AXNode* button_node = root_node->ChildAtIndex(0);
+  EXPECT_EQ(button.id, button_node->id());
+  EXPECT_EQ(button.role, button_node->data().role);
+
+  AXNode* checkbox_node = root_node->ChildAtIndex(1);
+  EXPECT_EQ(checkbox.id, checkbox_node->id());
+  EXPECT_EQ(checkbox.role, checkbox_node->data().role);
+}
+
+}  // namespace ui