LayoutTests/performance-api/performance-timeline-serializers.html

<!DOCTYPE HTML>
<html>
<head>
<script src="../resources/js-test-pre.js"></script>
</head>
<body>
<script>
description("Test for performance-timeline serializers.");

performance.mark("test");
performance.measure("test");

function filter(key, value) {
    if (typeof value === "number")
        return "<filtered number>";
    return value;
}

window.entry = null;
for (entry of performance.getEntriesByName("test")) {
    testPassed(JSON.stringify(entry, filter));
    shouldBe(`Object.keys(JSON.parse(JSON.stringify(entry))).length`, `4`);
}
</script>
<script src="../resources/js-test-post.js"></script>
</body>
</html>