public void TestValidateNotHavingGrandChildren()
        {
            // Arrange
            var header = new Header {
                Depth = 2, From = 5, To = 5, Name = "Headers", Children =
                    new List <Header> {
                    new Header {
                        Depth = 3, From = 5, To = 5, Name = "Cache"
                    }
                }
            };

            // Act
            HeaderValidator.ValidateNotHavingGrandChildren(header);
        }