import 'package:flutter_test/flutter_test.dart';

import 'package:guru_utils/random/pseudo_random.dart'; // 导入PseudoRandom类的路径

void main() {
  group('PseudoRandom', () {
    test('nextInt generates random integers', () {
      final prng = PseudoRandom(42);
      final numbers = List.generate(5, (_) => prng.nextInt());
      expect(numbers, isNotEmpty);
      expect(numbers, isNot(containsDuplicates(numbers)));
    });

    test('nextBool generates random booleans', () {
      final prng = PseudoRandom(42);
      final bools = List.generate(5, (_) => prng.nextBool());
      expect(bools, isNotEmpty);
      expect(bools, contains(true));
      expect(bools, contains(false));
    });

    test('shuffle shuffles a list', () {
      final prng = PseudoRandom(42);
      final originalList = [1, 2, 3, 4, 5];
      final shuffledList = List.from(originalList);
      prng.shuffle(shuffledList);
      expect(shuffledList, isNotEmpty);
      expect(shuffledList, isNot(equals(originalList)));
      expect(shuffledList.length, equals(originalList.length));
      expect(shuffledList, containsAll(originalList));
    });
  });
}

// 辅助函数：检查给定的列表是否包含重复元素
bool containsDuplicates(List list) {
  return list.length != list.toSet().length;
}