import { describe, expect, it } from "vitest";
import { hardenAssetHeaders, REVALIDATED_IMMUTABLE } from "$lib/assetHeaders";

// what @sveltejs/adapter-cloudflare appends to the deployed _headers
const adapterHeaders = `
# === START AUTOGENERATED SVELTE IMMUTABLE HEADERS ===
/_app/*
  X-Robots-Tag: noindex
	Cache-Control: no-cache
/_app/immutable/*
  ! Cache-Control
	Cache-Control: public, immutable, max-age=31536000
# === END AUTOGENERATED SVELTE IMMUTABLE HEADERS ===
`;

describe("hardenAssetHeaders", () => {
	it("overrides the adapter's year-long rule from behind it", () => {
		const hardened = hardenAssetHeaders(adapterHeaders);
		expect(hardened.indexOf(REVALIDATED_IMMUTABLE)).toBeGreaterThan(
			hardened.indexOf("public, immutable, max-age=31536000")
		);
	});

	it("leaves the rest of the file alone", () => {
		expect(hardenAssetHeaders(adapterHeaders)).toContain("X-Robots-Tag: noindex");
	});

	it("is idempotent, so a rebuilt file grows no rules", () => {
		const once = hardenAssetHeaders(adapterHeaders);
		expect(hardenAssetHeaders(once)).toBe(once);
	});
});