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

        public static void CopyTo_Invalid()
        {
            var builder = new StringBuilder("Hello");
            Assert.Throws<ArgumentNullException>("destination", () => builder.CopyTo(0, null, 0, 0)); // Destination is null

            Assert.Throws<ArgumentOutOfRangeException>("sourceIndex", () => builder.CopyTo(-1, new char[10], 0, 0)); // Source index < 0
            Assert.Throws<ArgumentOutOfRangeException>("sourceIndex", () => builder.CopyTo(6, new char[10], 0, 0)); // Source index > builder.Length

            Assert.Throws<ArgumentOutOfRangeException>("destinationIndex", () => builder.CopyTo(0, new char[10], -1, 0)); // Destination index < 0
            Assert.Throws<ArgumentOutOfRangeException>("count", () => builder.CopyTo(0, new char[10], 0, -1)); // Count < 0

            Assert.Throws<ArgumentException>(null, () => builder.CopyTo(5, new char[10], 0, 1)); // Source index + count > builder.Length
            Assert.Throws<ArgumentException>(null, () => builder.CopyTo(4, new char[10], 0, 2)); // Source index + count > builder.Length

            Assert.Throws<ArgumentException>(null, () => builder.CopyTo(0, new char[10], 10, 1)); // Destination index + count > destinationArray.Length
            Assert.Throws<ArgumentException>(null, () => builder.CopyTo(0, new char[10], 9, 2)); // Destination index + count > destinationArray.Length
        }