add more tests

engine/lib/MapArray.test.ts

@@ -0,0 +1,27 @@
+import { expect, test } from "vitest";
+import { box } from "./box.ts";
+import MapArray from "./MapArray.ts";
+
+test("MapArray", () => {
+	const mapArray = new MapArray([
+		["a", box(1)],
+		["b", box(2)],
+		["c", box(3)],
+	]);
+	mapArray.set("foo", box(42));
+	mapArray.set("bar", box(0));
+	mapArray.delete("bar");
+
+	expect(mapArray.get("foo")!.value).toBe(42);
+	expect(mapArray.get("bar")).toBe(undefined);
+	expect(mapArray.map.size).toBe(mapArray.array.length);
+	expect(
+		mapArray.entries().reduce(
+			(a, c) => {
+				a[1].value = a[1].value + c[1].value;
+				return a;
+			},
+			["_", box(0)],
+		)[1].value,
+	).toBe(48);
+});

engine/lib/MapArray.ts

@@ -1,4 +1,4 @@
-import type { Box } from "#/engine/Box.ts";
+import type { Box } from "./box.ts";
 
 export default class MapArray<K, V> {
 	map: Map<K, Box<V>>;

engine/lib/box.test.ts

@@ -0,0 +1,7 @@
+import { expect, test } from "vitest";
+import { type Box, box } from "./box.ts";
+
+test("box", () => {
+	const b: Box<number> = box(42);
+	expect(b).toEqual({ value: 42 });
+});

engine/lib/box.ts

@@ -0,0 +1,7 @@
+export type Box<T> = {
+	value: T;
+};
+
+export function box<T>(value: T): Box<T> {
+	return { value };
+}