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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/renderer/accessibility/ax_tree_distiller.h"
#include <memory>
#include <string>
#include <vector>
#include "base/functional/bind.h"
#include "chrome/test/base/chrome_render_view_test.h"
#include "content/public/renderer/render_frame.h"
#include "ui/accessibility/ax_node.h"
#include "ui/accessibility/ax_tree.h"
class AXTreeDistillerTestBase : public ChromeRenderViewTest {
public:
AXTreeDistillerTestBase() = default;
AXTreeDistillerTestBase(const AXTreeDistillerTestBase&) = delete;
AXTreeDistillerTestBase& operator=(const AXTreeDistillerTestBase&) = delete;
~AXTreeDistillerTestBase() override = default;
void DistillPage(const char* html,
const std::vector<std::string>& expected_node_contents) {
expected_node_contents_ = expected_node_contents;
LoadHTML(html);
content::RenderFrame* render_frame =
content::RenderFrame::FromWebFrame(GetMainFrame());
ui::AXTreeUpdate snapshot;
// |ui::AXMode::kHTML| is needed for retrieving the presence of the
// "aria-expanded" attribute.
// TODO(crbug.com/366000250): This is a heavy-handed approach as it copies
// all HTML attributes into the accessibility tree. It should be removed
// ASAP.
//
// |ui::AXMode::kExtendedProperties| is needed for heading level
// information.
const ui::AXMode ax_mode = ui::AXMode::kWebContents | ui::AXMode::kHTML |
ui::AXMode::kExtendedProperties;
render_frame->CreateAXTreeSnapshotter(ax_mode)->Snapshot(
/* max_nodes= */ 0,
/* timeout= */ {}, &snapshot);
ui::AXTree tree(snapshot);
distiller_ = std::make_unique<AXTreeDistiller>(
render_frame,
base::BindRepeating(&AXTreeDistillerTestBase::OnAXTreeDistilled,
base::Unretained(this), &tree));
distiller_->Distill(tree, snapshot, ukm::kInvalidSourceId);
}
void OnAXTreeDistilled(ui::AXTree* tree,
const ui::AXTreeID& tree_id,
const std::vector<int32_t>& content_node_ids) {
// Content node IDs list should be the same length as
// |expected_node_contents_|.
EXPECT_EQ(content_node_ids.size(), expected_node_contents_.size());
EXPECT_EQ(tree_id, tree->GetAXTreeID());
// Iterate through each content node ID from distiller and check that the
// text value equals the passed-in string from |expected_node_contents_|.
for (size_t i = 0; i < content_node_ids.size(); i++) {
ui::AXNode* node = tree->GetFromId(content_node_ids[i]);
EXPECT_TRUE(node);
EXPECT_TRUE(node->GetTextContentLengthUTF8());
EXPECT_EQ(node->GetTextContentUTF8(), expected_node_contents_[i]);
}
}
private:
std::unique_ptr<AXTreeDistiller> distiller_;
std::vector<std::string> expected_node_contents_;
};
struct TestCase {
const char* test_name;
const char* html;
std::vector<std::string> expected_node_contents;
};
class AXTreeDistillerTest : public AXTreeDistillerTestBase,
public ::testing::WithParamInterface<TestCase> {
public:
static std::string ParamInfoToString(
::testing::TestParamInfo<TestCase> param_info) {
return param_info.param.test_name;
}
};
// AXTreeDistillerTest is a parameterized test. Add each test case to the object
// below in the form of struct |TestCase|. Include a dividing line as a comment
// for easy reading.
const TestCase kDistillWebPageTestCases[] = {
{"simple_page",
R"HTML(<!doctype html>
<body role="main">
<p>Test</p>
<body>)HTML",
{"Test"}},
/* ----------------------- */
{"simple_page_with_main",
R"HTML(<!doctype html>
<body role="main">
<h1>Heading</h1>
<p>Test 1</p>
<p>Test 2</p>
<div role='header'><h2>Header</h2></div>
<body>)HTML",
{"Heading", "Test 1", "Test 2", "Header"}},
/* ----------------------- */
{"simple_page_with_main_and_article",
R"HTML(<!doctype html>
<body>
<main>
<p>Main</p>
</main>
<div role="article">
<p>Article 1</p>
</div>
<div role="article">
<p>Article 2</p>
</div>
<body>)HTML",
{"Main", "Article 1", "Article 2"}},
/* ----------------------- */
{"simple_page_no_content",
R"HTML(<!doctype html>
<body>
<main>
<div role='banner'>Banner</div>
<div role="navigation'>Navigation</div>
<audio>Audio</audio>
<img alt='Image alt'></img>
<button>Button</button>
<div aria-label='Label'></div>
<div role='complementary'>Complementary</div>
<div role='content'>Content Info</div>
<footer>Footer</footer>
</main>
<body>)HTML",
{}},
/* ----------------------- */
{"simple_page_no_main",
R"HTML(<!doctype html>
<body>
<div tabindex='0'>
<p>Paragraph</p>
<p>Paragraph</p>
</div>
<body>)HTML",
{}},
/* ----------------------- */
{"include_paragraphs_in_collapsed_nodes",
R"HTML(<!doctype html>
<body role="main">
<p>P1</p>
<div>
<p>P2</p>
<p>P3</p>
</div>
<body>)HTML",
{"P1", "P2", "P3"}},
/* ----------------------- */
{"main_may_be_deep_in_tree",
R"HTML(<!doctype html>
<body>
<p>P1</p>
<main>
<p>P2</p>
<p>P3</p>
</main>
<body>)HTML",
{"P2", "P3"}},
/* ----------------------- */
{"paragraph_with_bold",
R"HTML(<!doctype html>
<body role="main">
<p>Some <b>bolded</b> text</p>
<body>)HTML",
{"Some bolded text"}},
/* ----------------------- */
{"simple_page_nested_article",
R"HTML(<!doctype html>
<body>
<div role="main">
<p>Main</p>
<div role="article">
<p>Article 1</p>
</div>
</div>
<div role="article">
<p>Article 2</p>
<div role="article">
<p>Article 3</p>
</div>
</div>
<body>)HTML",
{"Main", "Article 1", "Article 2", "Article 3"}},
/* ----------------------- */
{"simple_page_with_heading_outside_of_main",
R"HTML(<!doctype html>
<body>
<h1>Heading</h1>
<main>
<p>Main</p>
</main>
<body>)HTML",
{"Heading", "Main"}},
/* ----------------------- */
{"simple_page_with_heading_no_main",
R"HTML(<!doctype html>
<body>
<h1>Heading</h1>
<body>)HTML",
{}},
/* ----------------------- */
{"simple_page_heading_offscreen",
R"HTML(<!doctype html>
<body>
<h1 style="
position: absolute;
left: -10000px;
top: -10000px;
width: 1px;
height: 1px;"
>
Heading
</h1>
<main>
<p>Main</p>
</main>
<body>)HTML",
{"Main"}},
/* ----------------------- */
// Ensure Gmail thread support.
{"simple_page_aria_expanded",
R"HTML(<!doctype html>
<body>
<main>
<p>Main</p>
<div role='listitem' aria-expanded='true'>Expanded</div>
<div role='listitem' aria-expanded='false'>Collapsed</div>
</main>
<body>)HTML",
{"Main", "Expanded"}},
};
TEST_P(AXTreeDistillerTest, DistillsWebPage) {
TestCase param = GetParam();
DistillPage(param.html, param.expected_node_contents);
}
INSTANTIATE_TEST_SUITE_P(/* prefix */,
AXTreeDistillerTest,
::testing::ValuesIn(kDistillWebPageTestCases),
AXTreeDistillerTest::ParamInfoToString);
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