Re-land: Reimplement automation API on top of C++-backed AXTree.

content/browser/accessibility/browser_accessibility_manager_unittest.cc

 // Copyright (c) 2012 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/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/accessibility/browser_accessibility.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #if defined(OS_WIN)
 #include "content/browser/accessibility/browser_accessibility_win.h"
@@ skipping 971 matching lines @@
   ASSERT_EQ(node5_accessible, manager->NextInTreeOrder(node4_accessible));
   ASSERT_EQ(NULL, manager->NextInTreeOrder(node5_accessible));
 
   ASSERT_EQ(NULL, manager->PreviousInTreeOrder(NULL));
   ASSERT_EQ(node4_accessible, manager->PreviousInTreeOrder(node5_accessible));
   ASSERT_EQ(node3_accessible, manager->PreviousInTreeOrder(node4_accessible));
   ASSERT_EQ(node2_accessible, manager->PreviousInTreeOrder(node3_accessible));
   ASSERT_EQ(root_accessible, manager->PreviousInTreeOrder(node2_accessible));
 }
 
+TEST(BrowserAccessibilityManagerTest, DeletingFocusedNodeDoesNotCrash) {
+  // Create a really simple tree with one root node and one focused child.
+  ui::AXNodeData root;
+  root.id = 1;
+  root.role = ui::AX_ROLE_ROOT_WEB_AREA;
+  root.state = 0;
+  root.child_ids.push_back(2);
+
+  ui::AXNodeData node2;
+  node2.id = 2;
+  node2.state = 1 << ui::AX_STATE_FOCUSED;
+
+  scoped_ptr<BrowserAccessibilityManager> manager(
+      BrowserAccessibilityManager::Create(
+          MakeAXTreeUpdate(root, node2),
+          NULL,

[dcheng, 2015/07/15 00:58:10]

Nit: nullptr

[dmazzoni, 2015/07/22 18:44:26]

Done throughout this file.

+          new CountedBrowserAccessibilityFactory()));
+
+  ASSERT_EQ(1, manager->GetRoot()->GetId());
+  ASSERT_EQ(1, manager->GetFocus(manager->GetRoot())->GetId());
+
+  // Send the focus event for node 2.
+  std::vector<AccessibilityHostMsg_EventParams> events;
+  events.push_back(AccessibilityHostMsg_EventParams());
+  events[0].update = MakeAXTreeUpdate(node2);
+  events[0].id = 2;
+  events[0].event_type = ui::AX_EVENT_FOCUS;
+  manager->OnAccessibilityEvents(events);
+
+  ASSERT_EQ(1, manager->GetRoot()->GetId());
+  ASSERT_EQ(2, manager->GetFocus(manager->GetRoot())->GetId());
+
+  // Now replace the tree with a new tree consisting of a single root.
+  ui::AXNodeData root2;
+  root2.id = 3;
+  root2.role = ui::AX_ROLE_ROOT_WEB_AREA;
+  root2.state = 0;
+
+  std::vector<AccessibilityHostMsg_EventParams> events2;
+  events2.push_back(AccessibilityHostMsg_EventParams());
+  events2[0].update = MakeAXTreeUpdate(root2);
+  events2[0].id = -1;
+  events2[0].event_type = ui::AX_EVENT_NONE;
+  manager->OnAccessibilityEvents(events2);
+
+  // Make sure that the focused node was updated to the new root and
+  // that this doesn't crash.
+  ASSERT_EQ(3, manager->GetRoot()->GetId());
+  ASSERT_EQ(3, manager->GetFocus(manager->GetRoot())->GetId());
+}
+
 }  // namespace content