Map with index dart extension

list_map_with_index_extension.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:vtenh/extensions/list_map_with_index_extension.dart';

void main() {
  group('.mapWithIndex', () {
    test('return a new list from map value and index as original Int type', () {
      List<int> items = [20, 30, 40];
      List<int> result = items.mapWithIndex((value, index) => index * 2);

      expect(result.length, 3);
      expect(result[0], 0);
      expect(result[1], 2);
      expect(result[2], 4);
    });

    test('return a new list from map value and index as String type', () {
      List<int> items = [20, 30, 40];
      List<String> result = items.mapWithIndex((value, index) => "${index * 2}");

      expect(result.length, 3);
      expect(result[0], '0');
      expect(result[1], '2');
      expect(result[2], '4');
    });
  });
}