public void GetTripPathFast_EmptyList_Success()
        {
            //arrange
            var cards = new TravelCard <string>[]
            {
            };

            var expectedResult = new TravelCard <string>[]
            {
            };

            //act
            var result = cards.GetTripPathFast();

            //assert
            CollectionAssert.AreEqual(expectedResult, result);
        }