public void Filter_FilterShouldWork()
        {
            // Arrange
            QueueLinkedList <double> sut = new QueueLinkedList <double> {
                double.MaxValue, 2.7, 4.25, 5.28, 1.3, 2.8
            };

            double[] expected = { 5.28, 4.25, double.MaxValue };

            // Act
            IEnumerable <double> actual = sut.Filter(item => item > 4.1);

            // Assert
            Assert.Equal(expected, actual);
        }