public void NthElement_ShouldBe_SumOfTwoPreviousElements(int elementNumber)
        {
            // Arrange / Act
            var fibonacciSequence = new FibonacciSequence(elementNumber);

            // Assert
            Assert.AreEqual(fibonacciSequence.Last(), fibonacciSequence.SkipLast(1).TakeLast(2).Sum());
        }