String Converter example and Unit Test

//Extension method

public static class StringExtensions
    {
        /// <summary>
        /// Converts a list of strings to title case
        /// </summary>
        public static string ConvertToTitleCase(this string source)
        {
            CultureInfo cultureInfo   = Thread.CurrentThread.CurrentCulture;
            TextInfo textInfo = cultureInfo.TextInfo;

            return textInfo.ToTitleCase(source);
        }
    }



//Unit Test
    [TestClass]
    public class StringExtensionsTest
    {
        public TestContext TestContext { get; set; }

        [TestMethod]
        public void ConvertToTitleCase()
        {
            // Arrange
            var source = "the return of the king";
            var expected = "The Return Of The King";

            // Act
           //var result = StringExtensions.ConvertToTitleCase(source);
            var result = source.ConvertToTitleCase();

            // Assert
            Assert.IsNotNull(result);
            Assert.AreEqual(expected, result);
        }

    }