// tools/registry-render.test.mjs
import { describe, it, expect } from 'vitest';
import { replaceRegion } from './registry-render.mjs';

describe('registry-render', () => {
  it('replaces auto-region between markers', () => {
    const input = `Header\n<!-- auto:foo:begin -->\nold content\n<!-- auto:foo:end -->\nFooter`;
    const out = replaceRegion(input, 'foo', 'NEW CONTENT');
    expect(out).toContain('NEW CONTENT');
    expect(out).not.toContain('old content');
    expect(out).toContain('Header');
    expect(out).toContain('Footer');
  });

  it('preserves end marker exactly', () => {
    const input = `<!-- auto:foo:begin -->\nold\n<!-- auto:foo:end -->`;
    const out = replaceRegion(input, 'foo', 'new');
    expect(out).toMatch(/<!-- auto:foo:end -->$/);
  });

  it('throws if markers missing', () => {
    expect(() => replaceRegion('no markers here', 'foo', 'x')).toThrow(/Markers.*not found/);
  });

  it('throws if only begin marker present', () => {
    expect(() => replaceRegion('<!-- auto:foo:begin -->\nstuff', 'foo', 'x')).toThrow();
  });

  it('handles multi-line rendered content', () => {
    const input = `<!-- auto:foo:begin -->\n<!-- auto:foo:end -->`;
    const out = replaceRegion(input, 'foo', 'line1\nline2\nline3');
    expect(out).toMatch(/line1\nline2\nline3/);
  });
});