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// Copyright (c) 2010 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/scoped_ptr.h"
#include "chrome/browser/browser_accessibility_manager_win.h"
#include "chrome/browser/browser_accessibility_win.h"
#include "testing/gtest/include/gtest/gtest.h"
using webkit_glue::WebAccessibility;
// Subclass of BrowserAccessibility that counts the number of instances.
class CountedBrowserAccessibility : public BrowserAccessibility {
public:
CountedBrowserAccessibility() { global_obj_count_++; }
virtual ~CountedBrowserAccessibility() { global_obj_count_--; }
static int global_obj_count_;
};
int CountedBrowserAccessibility::global_obj_count_ = 0;
// Factory that creates a CountedBrowserAccessibility.
class CountedBrowserAccessibilityFactory : public BrowserAccessibilityFactory {
public:
virtual ~CountedBrowserAccessibilityFactory() {}
virtual BrowserAccessibility* Create() {
CComObject<CountedBrowserAccessibility>* instance;
HRESULT hr = CComObject<CountedBrowserAccessibility>::CreateInstance(
&instance);
DCHECK(SUCCEEDED(hr));
return instance->NewReference();
}
};
// Test that BrowserAccessibilityManager correctly releases the tree of
// BrowserAccessibility instances upon delete.
TEST(BrowserAccessibilityTest, TestNoLeaks) {
// ATL needs a pointer to a COM module.
CComModule module;
_pAtlModule = &module;
// Make sure COM is initialized for this thread; it's safe to call twice.
::CoInitialize(NULL);
// Create WebAccessibility objects for a simple document tree,
// representing the accessibility information used to initialize
// BrowserAccessibilityManager.
WebAccessibility button;
button.id = 2;
button.name = L"Button";
button.role = WebAccessibility::ROLE_BUTTON;
button.state = 0;
WebAccessibility checkbox;
checkbox.id = 3;
checkbox.name = L"Checkbox";
checkbox.role = WebAccessibility::ROLE_CHECKBOX;
checkbox.state = 0;
WebAccessibility root;
root.id = 1;
root.name = L"Document";
root.role = WebAccessibility::ROLE_DOCUMENT;
root.state = 0;
root.children.push_back(button);
root.children.push_back(checkbox);
// Construct a BrowserAccessibilityManager with this WebAccessibility tree
// and a factory for an instance-counting BrowserAccessibility, and ensure
// that exactly 3 instances were created. Note that the manager takes
// ownership of the factory.
CountedBrowserAccessibility::global_obj_count_ = 0;
BrowserAccessibilityManager* manager =
new BrowserAccessibilityManager(
GetDesktopWindow(), root, NULL,
new CountedBrowserAccessibilityFactory());
ASSERT_EQ(3, CountedBrowserAccessibility::global_obj_count_);
// Delete the manager and test that all 3 instances are deleted.
delete manager;
ASSERT_EQ(0, CountedBrowserAccessibility::global_obj_count_);
// Construct a manager again, and this time use the IAccessible interface
// to get new references to two of the three nodes in the tree.
manager = new BrowserAccessibilityManager(
GetDesktopWindow(), root, NULL,
new CountedBrowserAccessibilityFactory());
ASSERT_EQ(3, CountedBrowserAccessibility::global_obj_count_);
BrowserAccessibility* root_accessible = manager->GetRoot();
IDispatch* root_iaccessible = NULL;
IDispatch* child1_iaccessible = NULL;
VARIANT var_child;
var_child.vt = VT_I4;
var_child.lVal = CHILDID_SELF;
HRESULT hr = root_accessible->get_accChild(var_child, &root_iaccessible);
ASSERT_EQ(S_OK, hr);
var_child.lVal = 1;
hr = root_accessible->get_accChild(var_child, &child1_iaccessible);
ASSERT_EQ(S_OK, hr);
// Now delete the manager, and only one of the three nodes in the tree
// should be released.
delete manager;
ASSERT_EQ(2, CountedBrowserAccessibility::global_obj_count_);
// Release each of our references and make sure that each one results in
// the instance being deleted as its reference count hits zero.
root_iaccessible->Release();
ASSERT_EQ(1, CountedBrowserAccessibility::global_obj_count_);
child1_iaccessible->Release();
ASSERT_EQ(0, CountedBrowserAccessibility::global_obj_count_);
}
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