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// Copyright 2023 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/string_util.h"
#include "chrome/browser/page_load_metrics/integration_tests/metric_integration_test.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/test/base/ui_test_utils.h"
#include "components/metrics/content/subprocess_metrics_provider.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
namespace {
std::unique_ptr<net::test_server::HttpResponse> ServePreloadHeader(
const std::string& request_path,
const net::test_server::HttpRequest& request) {
if (!base::StartsWith(request.relative_url, request_path,
base::CompareCase::SENSITIVE)) {
return nullptr;
}
std::unique_ptr<net::test_server::BasicHttpResponse> http_response(
new net::test_server::BasicHttpResponse);
http_response->set_code(net::HTTP_FOUND);
http_response->AddCustomHeader("Link",
"</fonts/AD.woff>; rel=preload; as=font");
return std::move(http_response);
}
} // namespace
IN_PROC_BROWSER_TEST_F(MetricIntegrationTest, UnusedHeaderFontPreload) {
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&ServePreloadHeader, "/header_preload.html"));
ASSERT_TRUE(embedded_test_server()->Start());
Load("/header_preload.html");
const std::string wait_for_warning = R"(
(async () => {
await new Promise(
resolve => {
if (document.readyState = "complete") {
setTimeout(resolve, 3500);
} else {
window.addEventListener("DOMContentLoaded", () => {
setTimeout(resolve, 3500);
});
}
});
})();
)";
ASSERT_TRUE(EvalJs(browser()->tab_strip_model()->GetActiveWebContents(),
wait_for_warning)
.error.empty());
// Finish session.
ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), GURL("about:blank")));
// Actually fetch the metrics.
content::FetchHistogramsFromChildProcesses();
metrics::SubprocessMetricsProvider::MergeHistogramDeltasForTesting();
int32_t unused_font_preloads = histogram_tester().GetBucketCount(
"Renderer.Preload.UnusedResource", /*ResourceType::kFont*/ 4);
int32_t unused_script_preloads = histogram_tester().GetBucketCount(
"Renderer.Preload.UnusedResource", /*ResourceType::kScript*/ 3);
ASSERT_EQ(unused_font_preloads, 1);
ASSERT_EQ(unused_script_preloads, 0);
}
IN_PROC_BROWSER_TEST_F(MetricIntegrationTest, UnusedFontPreload) {
Start();
Load("/render_blocking_resource_and_preloaded_font.html");
const std::string wait_for_warning = R"(
(async () => {
await new Promise(
resolve => {
if (document.readyState = "complete") {
setTimeout(resolve, 3500);
} else {
window.addEventListener("DOMContentLoaded", () => {
setTimeout(resolve, 3500);
});
}
});
})();
)";
ASSERT_TRUE(EvalJs(browser()->tab_strip_model()->GetActiveWebContents(),
wait_for_warning)
.error.empty());
// Finish session.
ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), GURL("about:blank")));
// Actually fetch the metrics.
content::FetchHistogramsFromChildProcesses();
metrics::SubprocessMetricsProvider::MergeHistogramDeltasForTesting();
int32_t unused_font_preloads = histogram_tester().GetBucketCount(
"Renderer.Preload.UnusedResource", /*ResourceType::kFont*/ 4);
int32_t unused_script_preloads = histogram_tester().GetBucketCount(
"Renderer.Preload.UnusedResource", /*ResourceType::kScript*/ 3);
ASSERT_EQ(unused_font_preloads, 1);
ASSERT_EQ(unused_script_preloads, 0);
}
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