textbook/fauxauth

import { generateHex } from "./utils.js";

describe("generateHex function", () => {
    it("generates valid hex strings", () => {
        expect(generateHex(20)).toMatch(/[0-9a-f]{20}/);
        expect(generateHex(40)).toMatch(/[0-9a-f]{40}/);
    });

    it("generates unique hex strings", () => {
        expect(generateHex(20)).not.toBe(generateHex(20));
    });

    it("generates hex strings without loads of zeroes", () => {
        const hex = generateHex(40);
        const zeroes = Array.from(hex).reduce((count, char) => count + (char === "0" ? 1 : 0), 0);
        expect(zeroes).toBeLessThan(10);
    });
});