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

        public static void Insert_Char_Invalid()
        {
            var builder = new StringBuilder(0, 5);
            builder.Append("Hello");

            Assert.Throws<ArgumentOutOfRangeException>("index", () => builder.Insert(-1, '\0')); // Index < 0
            Assert.Throws<ArgumentOutOfRangeException>("index", () => builder.Insert(builder.Length + 1, '\0')); // Index > builder.Length
            Assert.Throws<ArgumentOutOfRangeException>("requiredLength", () => builder.Insert(builder.Length, '\0')); // New length > builder.MaxCapacity
        }