System.Text.Tests.StringBuilderTests.AppendLine C# (CSharp) Method

        public static void AppendLine(string original, string value, string expected)
        {
            StringBuilder builder;
            if (string.IsNullOrEmpty(value))
            {
                // Use AppendLine()
                builder = new StringBuilder(original);
                builder.AppendLine();
                Assert.Equal(expected, builder.ToString());
            }
            // Use AppendLine(string)
            builder = new StringBuilder(original);
            builder.AppendLine(value);
            Assert.Equal(expected, builder.ToString());
        }