System.Text.Tests.StringBuilderTests.Insert_CharArray C# (CSharp) Метод

        public static void Insert_CharArray(string original, int index, char[] value, int startIndex, int charCount, string expected)
        {
            StringBuilder builder;
            if (startIndex == 0 && charCount == (value?.Length ?? 0))
            {
                // Use Insert(int, char[])
                builder = new StringBuilder(original);
                builder.Insert(index, value);
                Assert.Equal(expected, builder.ToString());
            }
            // Use Insert(int, char[], int, int)
            builder = new StringBuilder(original);
            builder.Insert(index, value, startIndex, charCount);
            Assert.Equal(expected, builder.ToString());
        }