Adjust tests to use vitest + jsdom

engine/lib/cache.test.ts

@@ -1,5 +1,5 @@
 import { expect, test, vi } from "vitest";
-import { type Cache, memoize, withCache } from "#/engine/lib/cache.ts";
+import { type Cache, memoize, withCache } from "./cache.ts";
 
 test("withCache", () => {
 	const cache: Cache<number> = new Map();
@@ -31,10 +31,11 @@ test("async withCache", async () => {
 	const callback = withCache(fn, cache);
 
 	const one = "1";
-	const res = await callback("one", one);
-	const _ = await callback("one", one);
+	const res = callback("one", one);
+	const _ = callback("one", one);
 
-	expect(res).toBe(1);
+	expect(res).toBe(_);
+	expect(await res).toBe(1);
 	expect(fn).toHaveBeenCalledTimes(1);
 
 	expect(await callback("two", "2")).toBe(2);