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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);
});
let loadResourcesToFillFutureBuffer = () => {
return new Promise(resolve => {
// Gather up 3 Resource Entries to kick off the rest of test behavior.
let resources = 0;
let observer = new PerformanceObserver(function(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 setBufferFullEventAndBufferSize = () => {
performance.setResourceTimingBufferSize(3);
performance.onresourcetimingbufferfull = function() {
eventFired = true;
performance.clearResourceTimings();
};
};
let clearAndAddAnotherEntryToBuffer = () => {
return new Promise(resolve => {
performance.clearResourceTimings();
loadRandomResource().then(resolve);
});
};
let testThatEntryWasAdded = () => {
return new Promise((resolve, reject) => {
let waitForIt = function() {
if (performance.getEntriesByType("resource").length) {
resolve();
} else {
reject("After buffer full, entry never added to primary");
}
}
step_timeout(waitForIt, 0);
});
};
promise_test(async () => {
await loadResourcesToFillFutureBuffer();
setBufferFullEventAndBufferSize();
// Overflow the buffer.
await loadRandomResource();
await waitForEventToFire();
await clearAndAddAnotherEntryToBuffer();
// Since we have no strict guarantees when an entry will be added to the
// buffer, waiting till next task to try to avoid flakiness.
await waitForNextTask();
await testThatEntryWasAdded();
}, "Test that entry was added to the buffer after a buffer full event");
</script>
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