import { describe, expect, it } from 'vitest';
import { TERM_RENDER_CAP, visibleTerminalLines } from './terminalRenderCap';

describe('terminalRenderCap', () => {
  it('renders only the newest window at cap', () => {
    const lines = Array.from({ length: TERM_RENDER_CAP + 25 }, (_, i) => `line-${i}`);
    const { visible, truncated, hidden } = visibleTerminalLines(lines);
    expect(visible).toHaveLength(TERM_RENDER_CAP);
    expect(visible[0]).toBe('line-25');
    expect(truncated).toBe(true);
    expect(hidden).toBe(25);
  });
});