public void GetContents_WhenNewsletterWithPattern_ReturnContents()
        {
            // Arrange
            var newsletter = new Newsletter
            {
                Id             = "0001",
                DisplayPattern = "HHTTHH",
                HostIds        = new List <string> {
                    "0000", "0001", "0002", "0003", "0004"
                },
                TripIds = new List <string> {
                    "0000", "0001", "0002", "0003", "0004"
                }
            };

            // Act
            var result = _newsletterService.GetContents(newsletter);

            // Assert
            Assert.That(result.Count, Is.EqualTo(newsletter.DisplayPattern.Length));
        }