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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/strings/stringprintf.h"
#include "base/test/scoped_feature_list.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_window.h"
#include "chrome/common/chrome_features.h"
#include "chrome/test/base/chrome_test_utils.h"
#include "chrome/test/base/platform_browser_test.h"
#include "chrome/test/base/ui_test_utils.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/browser/web_contents.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/geometry/rect.h"
namespace chrome {
class ReduceScreenSizeMetricsTest : public PlatformBrowserTest,
public testing::WithParamInterface<bool> {
public:
ReduceScreenSizeMetricsTest() {
// Enable the feature:
feature_list_.InitWithFeatureState(
features::kIncognitoFingerprintingInterventions, GetParam());
}
bool is_feature_enabled() { return GetParam(); }
std::string viewport_dimensions(content::WebContents* web_contents) {
gfx::Rect viewport = web_contents->GetContainerBounds();
return base::StringPrintf("%dx%d", viewport.width(), viewport.height());
}
std::string actual_screen_dimensions(content::WebContents* web_contents) {
return web_contents->GetRenderWidgetHostView()
->GetScreenInfo()
.rect.size()
.ToString();
}
content::WebContents* InitializeWebContents(Browser* browser) {
// Resize the window to an invalidly-small size, which will result in the
// window actually resizing to the smallest size allowed by the platform,
// tab strip, scrollbars, etc. This will result something smaller than the
// screen, which ensures a delta we can measure.
const gfx::Rect new_bounds(10, 20, 1, 1);
browser->window()->SetBounds(new_bounds);
// Navigate to an empty page:
GURL url(embedded_test_server()->GetURL("/empty.html"));
EXPECT_TRUE(ui_test_utils::NavigateToURL(browser, url));
content::WebContents* web_contents =
browser->tab_strip_model()->GetActiveWebContents();
EXPECT_TRUE(web_contents);
return web_contents;
}
protected:
void SetUpOnMainThread() override {
PlatformBrowserTest::SetUpOnMainThread();
ASSERT_TRUE(embedded_test_server()->Start());
}
base::test::ScopedFeatureList feature_list_;
};
INSTANTIATE_TEST_SUITE_P(All,
ReduceScreenSizeMetricsTest,
testing::Bool(),
[](const testing::TestParamInfo<bool>& info) {
return base::StringPrintf(
"Flag%s", info.param ? "Enabled" : "Disabled");
});
IN_PROC_BROWSER_TEST_P(ReduceScreenSizeMetricsTest, IncognitoScreenSize) {
// Initialize the test with a newly-created Incognito browser:
content::WebContents* web_contents =
InitializeWebContents(CreateIncognitoBrowser());
// Verify screen properties: if the feature flag is enabled, the screen size
// will be the viewport size in Incognito browsers. If the flag is
// disabled, the screen size will be the actual screen size.
content::EvalJsResult reported_screen_size =
content::EvalJs(web_contents, "`${screen.width}x${screen.height}`");
if (is_feature_enabled()) {
EXPECT_EQ(viewport_dimensions(web_contents), reported_screen_size);
EXPECT_NE(actual_screen_dimensions(web_contents), reported_screen_size);
} else {
EXPECT_NE(viewport_dimensions(web_contents), reported_screen_size);
EXPECT_EQ(actual_screen_dimensions(web_contents), reported_screen_size);
}
}
IN_PROC_BROWSER_TEST_P(ReduceScreenSizeMetricsTest, RegularScreenSize) {
// Initialize the test with the framework's existing non-Incognito browser:
content::WebContents* web_contents = InitializeWebContents(browser());
// Verify screen properties: regardless of the feature flag, the reported
// screen size will be the actual screen size in non-Incognito browsers.
std::string expectation = actual_screen_dimensions(web_contents);
EXPECT_EQ(expectation,
EvalJs(web_contents, "`${screen.width}x${screen.height}`"));
}
} // namespace chrome
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