mozilla-central/testing/web-platform/tests/WebCryptoAPI/randomUUID.https.any.js (file symbol)

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Test Info:

// Run for enough iterations that we're likely to catch edge-cases, like
// failing to set a reserved bit:
const iterations = 256;
// Track all the UUIDs generated during test run, bail if we ever collide:
const uuids = new Set()
function randomUUID() {
const uuid = self.crypto.randomUUID();
if (uuids.has(uuid)) {
throw new Error(`uuid collision ${uuid}`)
}
uuids.add(uuid);
return uuid;
}
// UUID is in namespace format (16 bytes separated by dashes):
test(function() {
const UUIDRegex = /^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/
for (let i = 0; i < iterations; i++) {
assert_true(UUIDRegex.test(randomUUID()));
}
}, "namespace format");
// Set the 4 most significant bits of array[6], which represent the UUID
// version, to 0b0100:
test(function() {
for (let i = 0; i < iterations; i++) {
let value = parseInt(randomUUID().split('-')[2].slice(0, 2), 16);
value &= 0b11110000;
assert_true(value === 0b01000000);
}
}, "version set");
// Set the 2 most significant bits of array[8], which represent the UUID
// variant, to 0b10:
test(function() {
for (let i = 0; i < iterations; i++) {
// Grab the byte representing array[8]:
let value = parseInt(randomUUID().split('-')[3].slice(0, 2), 16);
value &= 0b11000000
assert_true(value === 0b10000000);
}
}, "variant set");