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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<link rel="help" href="https://w3c.github.io/resource-timing/#dom-performance-setresourcetimingbuffersize">
<title>This test validates that setResourceTimingBufferFull behaves appropriately when set to the current buffer level.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/buffer-full-utilities.js"></script>
</head>
<body>
<script>
let eventFired = false;
let loadRandomResource = () => {
return fetch(window.location.href + "?" + Math.random());
};
setup(() => {
// Get the browser into a consistent state.
clearBufferAndSetSize(100);
window.result = "";
});
let fillUpTheBuffer = () => {
return new Promise(resolve => {
// Gather up 3 Resource Entries to kick off the rest of test behavior.
let resources = 0;
let observer = new PerformanceObserver(list => {
resources += list.getEntriesByType("resource").length;
if (resources !== 3)
return;
observer.disconnect();
resolve();
});
observer.observe({entryTypes: ["resource"]});
for (let i = 0; i < 3; ++i)
loadRandomResource();
});
};
let setBufferSize = () => {
performance.onresourcetimingbufferfull = () => {
eventFired = true;
window.result += "Event Fired with " + performance.getEntriesByType("resource").length + " entries. ";
performance.clearResourceTimings();
};
window.result += "before setLimit(3). ";
performance.setResourceTimingBufferSize(3);
window.result += "after setLimit(3). ";
};
let overflowTheBuffer = () => {
return new Promise(resolve => {
loadRandomResource().then(() => {
window.result += "after loading 4th resource. ";
resolve();
});
});
};
let checkResult = () => {
return new Promise((resolve, reject) => {
if (window.result != "before setLimit(3). after setLimit(3). after loading 4th resource. Event Fired with 3 entries. ") {
reject("Non matching value: " + window.result);
}
let entries = performance.getEntriesByType("resource");
if (entries.length != 1) {
reject("Number of entries in resource timing buffer is unexpected: " + entries.length);
}
resolve();
});
};
promise_test(async () => {
await fillUpTheBuffer();
setBufferSize();
await overflowTheBuffer();
await waitForEventToFire();
await checkResult();
}, "Test that entries added and event firing happened in the right sequence");
</script>
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