@patternslib/patternslib/src/core/uuid.test.js

Patternslib is a JavaScript library that enables designers to build rich interactive prototypes without the need for writing any Javascript. All events are triggered by classes and other attributes in the HTML, without abusing the HTML as a programming la

import create_uuid from "./uuid";

describe("uuid", function () {
    it("returns a UUIDv4", function () {
        const uuid = create_uuid();
        expect(uuid).toMatch(
            /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/
        );
    });

    it("returns a sufficiently unique id", function () {
        // Mock window.crypto.randomUUID not existing, like in browser with
        // non-secure context.
        const orig_randomUUID = window.crypto.randomUUID;
        window.crypto.randomUUID = undefined;

        const uuid = create_uuid();
        expect(uuid).toMatch(/^[0-9]*$/);

        window.crypto.randomUUID = orig_randomUUID;
    });

    it("the uuid is unique", function () {
        expect(create_uuid()).not.toBe(create_uuid());
    });
});