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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/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"
IN_PROC_BROWSER_TEST_F(MetricIntegrationTest,
RenderBlockingResourceAndPreloadedFont) {
Start();
Load("/render_blocking_resource_and_preloaded_font.html");
// Finish session.
ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), GURL("about:blank")));
// Actually fetch the metrics.
content::FetchHistogramsFromChildProcesses();
metrics::SubprocessMetricsProvider::MergeHistogramDeltasForTesting();
ExpectUniqueUMA("Renderer.CriticalFonts.BlockingResourcesLoadTime");
ExpectUniqueUMA("Renderer.CriticalFonts.PreloadedFontsLoadTime");
ExpectUniqueUMA("Renderer.CriticalFonts.CriticalFontDelay");
}
IN_PROC_BROWSER_TEST_F(MetricIntegrationTest,
RenderBlockingResourceAndSlowPreloadedFont) {
Start();
Load("/render_blocking_resource_and_slow_preloaded_font.html");
const std::string wait_for_resources = R"(
(async () => {
await new Promise(
resolve => {
(new PerformanceObserver(list => {
const entries = list.getEntries();
for (let entry of entries) {
if (entry.name.includes(".woff")) {
requestAnimationFrame(()=>{resolve()});
}
}
})).observe(
{type: 'resource', buffered: true})});
})();
)";
ASSERT_TRUE(EvalJs(browser()->tab_strip_model()->GetActiveWebContents(),
wait_for_resources)
.error.empty());
// Finish session.
ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), GURL("about:blank")));
// Actually fetch the metrics.
content::FetchHistogramsFromChildProcesses();
metrics::SubprocessMetricsProvider::MergeHistogramDeltasForTesting();
ExpectUniqueUMA("Renderer.CriticalFonts.BlockingResourcesLoadTime");
ExpectUniqueUMA("Renderer.CriticalFonts.PreloadedFontsLoadTime");
int script_load_time =
histogram_tester()
.GetAllSamples("Renderer.CriticalFonts.BlockingResourcesLoadTime")[0]
.min;
int font_load_time =
histogram_tester()
.GetAllSamples("Renderer.CriticalFonts.PreloadedFontsLoadTime")[0]
.min;
// The bucket size for each measurement is 200ms. Setting the margin of error
// to a bit above that both up and down, as we're verifying a diff of two
// measurements using their buckets, and we want to reduce flakiness.
ExpectUniqueUMAWithinRange("Renderer.CriticalFonts.CriticalFontDelay",
font_load_time - script_load_time, 210.0, 210.0);
}
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