/**
 * Guard test: verifies the package surface does not rely on
 * `Math.random()` or `Date.now()` directly in its runtime code.
 *
 * MIME detection is a pure function of its inputs — no time-based or
 * random-based side effects should be needed.
 */
import { describe, expect, it } from "@suaveplan/testing/runner";
import {
    detectFromMagicBytes,
    formatContentType,
    getMimeEntry,
    parseContentType,
} from "../src/index.js";

describe("no disallowed side-effects", () => {
    it("parseContentType is deterministic", { timeout: 5000 }, () => {
        const a = parseContentType("text/html; charset=utf-8");
        const b = parseContentType("text/html; charset=utf-8");
        expect(a).toEqual(b);
    });

    it("formatContentType is deterministic", { timeout: 5000 }, () => {
        const parsed = parseContentType("text/plain; charset=utf-8");
        expect(formatContentType(parsed)).toBe(formatContentType(parsed));
    });

    it("detectFromMagicBytes is deterministic", { timeout: 5000 }, () => {
        const png = new Uint8Array([
            0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,
        ]);
        const r1 = detectFromMagicBytes(png);
        const r2 = detectFromMagicBytes(png);
        expect(r1).toEqual(r2);
    });

    it("getMimeEntry is deterministic", { timeout: 5000 }, () => {
        expect(getMimeEntry("image/png")).toEqual(getMimeEntry("image/png"));
    });
});