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<!DOCTYPE HTML>
<html>
<head onload>
<meta charset="utf-8" />
<title>This test validates that synchronously adding entries in onresourcetimingbufferfull callback results in these entries being properly handled.</title>
<link rel="help" href="http://www.w3.org/TR/resource-timing/#performanceresourcetiming"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/buffer-full-utilities.js"></script>
</head>
<body>
<script>
const resource_timing_buffer_size = 1;
setup(() => {
// Get the browser into a consistent state.
clearBufferAndSetSize(resource_timing_buffer_size);
});
let overflowTheBufferAndWaitForEvent = () => {
return new Promise(resolve => {
var add_entry = () => {
performance.setResourceTimingBufferSize(resource_timing_buffer_size + 1);
// The sync entry is added to the secondary buffer, so will be the last one there and eventually dropped.
xhrScript("resources/empty.js?xhr");
resolve();
}
performance.addEventListener('resourcetimingbufferfull', add_entry);
// This resource overflows the entry buffer, and goes into the secondary buffer.
appendScript('resources/empty_script.js');
});
};
let testThatBufferContainsTheRightResources = () => {
let entries = performance.getEntriesByType('resource');
assert_equals(entries.length, 2,
'Both entries should be stored in resource timing buffer since its increases size once it overflows.');
assert_true(entries[0].name.includes('empty.js'), "empty.js is in the entries buffer");
assert_true(entries[1].name.includes('empty_script.js'), "empty_script.js is in the entries buffer");
};
promise_test(async () => {
await fillUpTheBufferWithSingleResource("resources/empty.js");
await overflowTheBufferAndWaitForEvent();
// TODO(yoav): Figure out why this task is needed
await waitForNextTask();
testThatBufferContainsTheRightResources();
}, "Test that entries synchronously added to the buffer during the callback are dropped");
</script>
</body>
</html>
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