如何在NUnit单元测试中记录错误和消息？

using NUnit.Framework;

namespace MyTests
{
    public class MyTestClass
    {
        [Test]
        public void TestAddition()
        {
            int a = 1;
            int b = 2;
            int expected = 3;
            int actual = Add(a, b);

            TestContext.Out.WriteLine("a = {0}, b = {1}, expected = {2}, actual = {3}", a, b, expected, actual);

            if (actual != expected)
            {
                TestContext.Error.WriteLine("Error: expected {0} but got {1}", expected, actual);
            }

            Assert.AreEqual(expected, actual);
        }

        private int Add(int a, int b)
        {
            return a + b;
        }
    }
}