Add ToString to AXTreeUpdate.

ui/accessibility/ax_tree_unittest.cc

 // Copyright 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 "base/strings/string_number_conversions.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"
@@ skipping 85 matching lines @@
   EXPECT_EQ(checkbox.id, checkbox_node->id());
   EXPECT_EQ(checkbox.role, checkbox_node->data().role);
 
   EXPECT_EQ(
       "id=1 root_web_area FOCUSABLE FOCUSED (0, 0)-(800, 600) child_ids=2,3\n"
       "  id=2 button (20, 20)-(200, 30)\n"
       "  id=3 check_box (20, 50)-(200, 30)\n",
       dst_tree.ToString());
 }
 
+TEST(AXTreeTest, SerializeAXTreeUpdate) {
+  AXNodeData list;
+  list.id = 3;
+  list.role = AX_ROLE_LIST;
+  list.state = 0;
+  list.child_ids.push_back(4);
+  list.child_ids.push_back(5);
+  list.child_ids.push_back(6);
+
+  AXNodeData list_item_2;
+  list_item_2.id = 5;
+  list_item_2.role = AX_ROLE_LIST_ITEM;
+  list_item_2.state = 0;
+
+  AXNodeData list_item_3;
+  list_item_3.id = 6;
+  list_item_3.role = AX_ROLE_LIST_ITEM;
+  list_item_3.state = 0;
+
+  AXNodeData button;
+  button.id = 7;
+  button.role = AX_ROLE_BUTTON;
+  button.state = 0;
+
+  AXTreeUpdate update;
+  update.nodes.push_back(list);
+  update.nodes.push_back(list_item_2);
+  update.nodes.push_back(list_item_3);
+  update.nodes.push_back(button);
+
+  EXPECT_EQ(
+      "id=3 list (0, 0)-(0, 0) child_ids=4,5,6\n"
+      "  id=5 list_item (0, 0)-(0, 0)\n"
+      "  id=6 list_item (0, 0)-(0, 0)\n"
+      "id=7 button (0, 0)-(0, 0)\n",
+      update.ToString());
+}
+
 TEST(AXTreeTest, DeleteUnknownSubtreeFails) {
   AXNodeData root;
   root.id = 1;
   root.role = AX_ROLE_ROOT_WEB_AREA;
 
   AXTreeUpdate initial_state;
   initial_state.nodes.push_back(root);
   AXTree tree(initial_state);
 
   // This should fail because we're asking it to delete
@@ skipping 118 matching lines @@
   EXPECT_EQ(2, fake_delegate.created_ids()[0]);
   EXPECT_EQ(3, fake_delegate.created_ids()[1]);
 
   ASSERT_EQ(1U, fake_delegate.new_root_ids().size());
   EXPECT_EQ(2, fake_delegate.new_root_ids()[0]);
 
   tree.SetDelegate(NULL);
 }
 
 }  // namespace ui