public void Add_With_Slash_At_The_Begining()
        {
            // Arrange
            var baseUri = new Uri(BASE_URL);

            // Act
            var result = baseUri.Add("/" + RELATIVE_URL);

            // Assert
            Assert.AreEqual($@"{BASE_URL}/{RELATIVE_URL}/", result.ToString());
        }
        public void Add()
        {
            // Arrange
            var baseUri = new Uri(BASE_URL);

            // Act
            var result = baseUri.Add(RELATIVE_URL);

            // Assert
            Assert.AreEqual($@"{BASE_URL}/{RELATIVE_URL}/", result.ToString());
        }