import { expect, test } from 'bun:test';
import { previewLines } from '../src/ui/DryRunPreview';

test('change lines are picked from a dry run', () => {
  const out = 'reading config\nconnected\n  ~ en-US title: Old -> New\n  + de-DE short description\ndone';
  expect(previewLines(out).lines).toEqual(['  ~ en-US title: Old -> New', '  + de-DE short description']);
});
test('no change lines: the last lines', () => {
  expect(previewLines('a\nb\nc', 2).lines).toEqual(['b', 'c']);
});
test('long previews say how many more', () => {
  const out = Array.from({ length: 20 }, (_, i) => `+ row ${i}`).join('\n');
  const p = previewLines(out, 5);
  expect(p.lines.length).toBe(5); expect(p.more).toBe(15);
});