import { describe, expect, it } from "@suaveplan/testing/runner";
import { createUint8ArraySlice } from "./uint8-slice.js";

describe("createUint8ArraySlice", () => {
    it("returns a slice of the given range", { timeout: 5000 }, () => {
        const src = new Uint8Array([10, 20, 30, 40, 50]);
        const out = createUint8ArraySlice(src, 1, 4);
        expect(Array.from(out)).toEqual([20, 30, 40]);
    });

    it("produces an independent copy (no shared memory)", {
        timeout: 5000,
    }, () => {
        const src = new Uint8Array([1, 2, 3, 4]);
        const out = createUint8ArraySlice(src, 0, 4);
        out[0] = 99;
        expect(src[0]).toBe(1);
    });

    it("returns empty when start === end", { timeout: 5000 }, () => {
        const src = new Uint8Array([1, 2, 3]);
        expect(createUint8ArraySlice(src, 1, 1).byteLength).toBe(0);
    });

    it("clamps end past length", { timeout: 5000 }, () => {
        const src = new Uint8Array([1, 2, 3]);
        expect(Array.from(createUint8ArraySlice(src, 0, 99))).toEqual([
            1, 2, 3,
        ]);
    });

    it("supports zero-length input", { timeout: 5000 }, () => {
        const src = new Uint8Array(0);
        expect(createUint8ArraySlice(src, 0, 0).byteLength).toBe(0);
    });
});