import { describe, expect, it } from "@suaveplan/testing/runner";
import { Xoshiro256PlusPlusRng } from "./xoshiro256.js";

class ZeroXoshiro extends Xoshiro256PlusPlusRng {
    public constructor() {
        super(1);
        this.s0 = 0n;
        this.s1 = 0n;
        this.s2 = 0n;
        this.s3 = 0n;
    }
    public callEnsureNonZero(): void {
        this.ensureNonZeroState();
    }
    public readState(): [bigint, bigint, bigint, bigint] {
        return [this.s0, this.s1, this.s2, this.s3];
    }
}

describe("Xoshiro256 ensureNonZeroState guard", () => {
    it("repairs an all-zero state by setting s0=1", { timeout: 5000 }, () => {
        const rng = new ZeroXoshiro();
        rng.callEnsureNonZero();
        expect(rng.readState()).toEqual([1n, 0n, 0n, 0n]);
    });
});