private void Should_create_dictionary <TKey, TValue>(Type collectionType)
        {
            var collection = _creator.Create(collectionType);

            collection.IsValid.Should().Be(true);
            collection.Value.Should().BeOfType <Dictionary <TKey, TValue> >();
        }
        private void Should_create_list <T>(Type collectionType)
        {
            var collection = _creator.Create(collectionType);

            collection.IsValid.Should().Be(true);
            collection.Value.Should().BeOfType <List <T> >();
        }