单元测试

在需要测试的解决方案中新建单元测试项目

在测试类中引用需要测试的项目引用编写测试方法

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.IO;

namespace UnitTestProject1
{
    [TestClass]
    public class UnitTest1
    {
        private const string Expected = "Hello World!";
        [TestMethod]
        public void TestMethod1()
        {
            using (var sw = new StringWriter())
            {
                Console.SetOut(sw);
                HelloWorldCore.Program.Main();
                var result = sw.ToString().Trim();
                //判断结果是否与预期一致
                Assert.AreEqual(Expected, result);
                //判断是否能引发异常
                Assert.ThrowsException<Exception>(() => HelloWorldCore.Program.Main());
            }
        }
        [TestMethod]
        public void TestMethod2()
        {
            using (var sw = new StringWriter())
            {
                Console.SetOut(sw);
                var result = HelloWorldCore.Program.SayGoodbye();
                Assert.AreEqual(Expected, result);
            }
        }
    }
}