refactor RingBuffer

engine/lib/RingBuffer.test.ts

@@ -0,0 +1,20 @@
+import { expect, test } from "vitest";
+import { claim, createRingBuffer } from "./RingBuffer.ts";
+
+test("RingBuffer", () => {
+	expect(() => createRingBuffer(3, () => ({}))).toThrow(
+		"size must be a power of two",
+	);
+
+	const pooled = createRingBuffer(4, () => ({}));
+
+	expect(pooled.size).toBe(4);
+	expect(pooled.cursor).toBe(0);
+	expect(pooled.buffer.length).toBe(4);
+
+	for (let i = 0; i < 8; i++) {
+		expect(claim(pooled)).toBe(pooled.buffer[i % 4]);
+	}
+
+	expect(pooled.cursor).toBe(0);
+});