import { describe, expect, it } from 'vitest';
import { truncateOutput } from './output';

const MAX_SIZE = 50 * 1024;

describe('truncateOutput', () => {
  it('returns text unchanged when under limit', () => {
    const text = 'small output';
    expect(truncateOutput(text)).toBe(text);
  });

  it('returns text unchanged at exact limit', () => {
    const text = 'a'.repeat(MAX_SIZE);
    expect(truncateOutput(text)).toBe(text);
  });

  it('truncates text over limit and appends warning', () => {
    const text = 'b'.repeat(MAX_SIZE + 100);
    const result = truncateOutput(text);
    expect(result.length).toBeLessThan(text.length);
    expect(result).toContain('[Output truncated');
    expect(result.startsWith('b'.repeat(MAX_SIZE))).toBe(true);
  });
});