Improve `asinit` tests

[Mopsgamer]

Feature suggestion

This is current initial test code for AS project:

// ./tests/index.js
import assert from "assert";
import { add } from "../build/debug.js";
assert.strictEqual(add(1, 2), 3);
console.log("ok");

Since Node 18 we have the --test flag: node --test tests/**/*. I suggest using this:

// ./tests/index.test.js <-- renamed
import assert from "assert";
import { add } from "../build/debug.js";
import { it } from "node:test";

it('add', () => {
    assert.strictEqual(add(1, 2), 3);
})

[CountBleck]

If you'd like, you can make a PR by changing bin/asinit.js. Otherwise, I can make it myself with your sample code or something similar to it.