buffer-full-store-and-clear-during-callback.html

<!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>
chromium/third_party/blink/web_tests/external/wpt/resource-timing/buffer-full-store-and-clear-during-callback.html
