import { expect, test } from "vitest";
import { claim, createRingBuffer, type RingBuffer } from "./RingBuffer.ts";

test("RingBuffer", () => {
	expect(() => createRingBuffer(3, () => ({}))).toThrow(
		"size must be a power of two",
	);

	const ring: RingBuffer<object> = createRingBuffer(4, () => ({}));

	expect(ring.size).toBe(4);
	expect(ring.cursor).toBe(0);
	expect(ring.buffer.length).toBe(4);

	for (let i = 0; i < 8; i++) {
		expect(claim(ring)).toBe(ring.buffer[i % 4]);
	}

	expect(ring.cursor).toBe(0);
});