import { describe, it, expect } from 'vitest';
import { fisherYates, buildShuffle } from '../tarot/shuffle';
import { TAROT_DECK } from '../tarot/cards';

describe('fisherYates', () => {
  it('원본을 변형하지 않고 같은 원소 집합을 반환한다', () => {
    const input = [1, 2, 3, 4, 5];
    const out = fisherYates(input);
    expect(input).toEqual([1, 2, 3, 4, 5]);
    expect([...out].sort()).toEqual([1, 2, 3, 4, 5]);
  });
});
describe('buildShuffle', () => {
  it('요청한 수만큼, 중복 없이, reversed 필드를 갖고 반환한다', () => {
    const out = buildShuffle(TAROT_DECK, 20);
    expect(out).toHaveLength(20);
    expect(new Set(out.map((c) => c.slug)).size).toBe(20);
    for (const c of out) expect(typeof c.reversed).toBe('boolean');
  });
});