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<!DOCTYPE HTML>
<html>
<head onload>
<meta charset="utf-8" />
<title>This test validates the behavior of read and clear operation in onresourcetimingbufferfull callback of resource timing.</title>
<link rel="author" title="Intel" href="http://www.intel.com/" />
<link rel="help" href="https://www.w3.org/TR/resource-timing-2/#dom-performance-onresourcetimingbufferfull"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/resource-loaders.js"></script>
<script src="resources/buffer-full-utilities.js"></script>
</head>
<body>
<script>
promise_test(async () => {
await fillUpTheBufferWithSingleResource();
const entryBuffer = [];
performance.addEventListener('resourcetimingbufferfull', () => {
entryBuffer.push(...performance.getEntriesByType('resource'));
performance.clearResourceTimings();
});
load.script(scriptResources[1]);
await bufferFullFirePromise;
const entries = performance.getEntriesByType('resource');
assert_equals(entries.length, 1,
"Only the last entry should be stored in resource timing buffer since it's cleared once it overflows.");
assert_true(entries[0].name.includes(scriptResources[1]),
scriptResources[1] + " is in the entries buffer");
assert_equals(entryBuffer.length, 1,
'1 resource timing entry should be moved to entryBuffer.');
assert_true(entryBuffer[0].name.includes(scriptResources[0]),
scriptResources[0] + ' is in the entryBuffer');
}, "Test that entries overflowing the buffer trigger the buffer full event, can be stored, and make their way to the primary buffer after it's cleared in the buffer full event.");
</script>
</body>
</html>
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