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// 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 <string>
#include "base/logging.h"
#include "base/path_service.h"
#include "base/string_util.h"
#include "base/string16.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "chrome/test/base/ui_test_utils.h"
#include "content/browser/accessibility/browser_accessibility.h"
#include "content/browser/accessibility/browser_accessibility_manager.h"
#include "content/browser/accessibility/dump_accessibility_tree_helper.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_paths.h"
#include "testing/gtest/include/gtest/gtest.h"
using content::OpenURLParams;
using content::RenderViewHostImpl;
using content::RenderWidgetHostImpl;
using content::RenderWidgetHost;
using content::Referrer;
namespace {
// Required to enter html content into a url.
static const std::string kUrlPreamble = "data:text/html,\n<!doctype html>";
} // namespace
// This test takes a snapshot of the platform BrowserAccessibility tree and
// tests it against an expected baseline.
//
// The flow of the test is as outlined below.
// 1. Load an html file from chrome/test/data/accessibility.
// 2. Read the expectation.
// 3. Browse to the page and serialize the platform specific tree into a human
// readable string.
// 4. Perform a comparison between actual and expected and fail if they do not
// exactly match.
class DumpAccessibilityTreeTest : public InProcessBrowserTest {
public:
DumpAccessibilityTreeHelper helper_;
};
IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
PlatformTreeDifferenceTest) {
content::RenderWidgetHostView* host_view =
browser()->GetSelectedWebContents()->GetRenderWidgetHostView();
RenderWidgetHost* host = host_view->GetRenderWidgetHost();
// TODO(joi): Remove this dependency
RenderViewHostImpl* view_host =
static_cast<RenderViewHostImpl*>(RenderWidgetHostImpl::From(host));
view_host->set_save_accessibility_tree_for_testing(true);
view_host->EnableRendererAccessibility();
// Setup test paths.
FilePath dir_test_data;
EXPECT_TRUE(PathService::Get(content::DIR_TEST_DATA, &dir_test_data));
FilePath test_path(dir_test_data.Append(FILE_PATH_LITERAL("accessibility")));
EXPECT_TRUE(file_util::PathExists(test_path))
<< test_path.LossyDisplayName();
// Grab all HTML files.
file_util::FileEnumerator file_enumerator(test_path,
false,
file_util::FileEnumerator::FILES,
FILE_PATH_LITERAL("*.html"));
// TODO(dtseng): Make each of these a gtest with script.
FilePath html_file(file_enumerator.Next());
ASSERT_FALSE(html_file.empty());
do {
std::string html_contents;
file_util::ReadFileToString(html_file, &html_contents);
std::string expected_contents;
FilePath expected_file =
FilePath(html_file.RemoveExtension().value() +
helper_.GetExpectedFileSuffix());
file_util::ReadFileToString(
expected_file,
&expected_contents);
// Load the page.
ui_test_utils::WindowedNotificationObserver tree_updated_observer(
content::NOTIFICATION_RENDER_VIEW_HOST_ACCESSIBILITY_TREE_UPDATED,
content::NotificationService::AllSources());
string16 html_contents16;
html_contents16 = UTF8ToUTF16(html_contents);
GURL url(UTF8ToUTF16(kUrlPreamble) + html_contents16);
browser()->OpenURL(OpenURLParams(
url, Referrer(), CURRENT_TAB, content::PAGE_TRANSITION_TYPED, false));
// Wait for the tree.
tree_updated_observer.Wait();
// Perform a diff (or write the initial baseline).
string16 actual_contents;
helper_.DumpAccessibilityTree(
host_view->GetBrowserAccessibilityManager()->GetRoot(),
&actual_contents);
std::string actual_contents8 = UTF16ToUTF8(actual_contents);
EXPECT_EQ(expected_contents, actual_contents8);
if (!file_util::PathExists(expected_file)) {
FilePath actual_file =
FilePath(html_file.RemoveExtension().value() +
helper_.GetActualFileSuffix());
EXPECT_TRUE(file_util::WriteFile(
actual_file, actual_contents8.c_str(), actual_contents8.size()));
ADD_FAILURE() << "No expectation found. Create it by doing:\n"
<< "mv " << actual_file.LossyDisplayName() << " "
<< expected_file.LossyDisplayName();
}
} while (!(html_file = file_enumerator.Next()).empty());
}
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