import { test } from 'node:test';
import assert from 'node:assert/strict';
import { deafenCatchUpText } from './deafenCatchUp';

const name = (u: string) => u.slice(1, u.indexOf(':'));

test('no change → nothing; joins and leaves are listed, capped at 3 + N more', () => {
  assert.equal(deafenCatchUpText(new Set(['@a:x']), new Set(['@a:x']), name), null);
  assert.equal(
    deafenCatchUpText(new Set(['@a:x', '@c:x']), new Set(['@a:x', '@b:x']), name),
    'While you were deafened: b joined · c left',
  );
  assert.equal(
    deafenCatchUpText(new Set(), new Set(['@a:x', '@b:x', '@c:x', '@d:x', '@e:x']), name),
    'While you were deafened: a, b, c and 2 more joined',
  );
});