import { describe, expect, it } from "vitest"; import { appendTextChunkWithinByteLimit, limitChunkToByteLimit } from "./outputBuffer"; describe("outputBuffer", () => {  it("keeps a full chunk when it fits within the byte limit", () => {    const chunk = Buffer.from("hello");     expect(limitChunkToByteLimit(chunk, 2, 10)).toEqual({      chunk,      nextBytes: 7,      truncated: false,      overflow: false,    });  });   it("truncates a chunk to the remaining byte budget", () => {    const chunk = Buffer.from("abcdef");    const limited = limitChunkToByteLimit(chunk, 3, 5);     expect(Buffer.from(limited.chunk).toString()).toBe("ab");    expect(limited.nextBytes).toBe(5);    expect(limited.truncated).toBe(true);    expect(limited.overflow).toBe(true);  });   it("appends only the bytes that fit", () => {    expect(appendTextChunkWithinByteLimit("pre", 3, Buffer.from("abcdef"), 7)).toEqual({      next: "preabcd",      nextBytes: 7,      truncated: true,    });  });});