public void GetThreeSum_Should_Return_ListOfList() { var numbers = new[] { -1, 0, 1, 2, -1, -4 }; var result = SuperArray.GetThreeSum(numbers); Assert.Equal(result, new List <List <int> > { new List <int> { -1, -1, 2 }, new List <int> { -1, 0, 1 } }); }