再Visual Studio中构建Nunit测试环境

一、安装  “NUnit Test Adapter”

二、写项目代码和测试项目代码

        项目结构如下：

        

     Calculator.cs代码如下

    

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DemoTest 
{
    public class Calculator
    {
        public int Add(int a, int b)
        {
            return a + b;
        }

        private static readonly object objSync = new object();
        private static Calculator instance = null;

        public static Calculator GetInstance()
        {
            if (instance == null)
            {
                lock (objSync)
                {
                    if (instance == null)
                    {
                        instance = new Calculator();
                    }
                }
            }
            return instance;
        }

    }
}

三、去掉微软自带的测试包，下载安装 “NUnit”包替换它

        

四、写测试代码

      UnitTest1.cs代码如下

      

using System;
using DemoTest;
using NUnit.Framework;

namespace UnitTestProject1
{
    [TestFixture]
    public class UnitTest1
    {
        [Test]
        public void AddTest()
        {
            var calc = new Calculator();
            var result = calc.Add(1, 1);
            Assert.AreEqual(2, result);
        }

        [Test]
        public void AddTestFailure()
        {
            var calc = new Calculator();
            var result = calc.Add(1, 1);
            Assert.AreEqual(10, result);
        }

        [Test]
        public void SingtonTest1()
        {
            var calc = Calculator.GetInstance();
            Assert.IsNull(calc);
        }

        [Test]
        public void SingtonTest2()
        {
            var calc1 = Calculator.GetInstance();
            var calc2 = Calculator.GetInstance();
            Assert.IsTrue(object.Equals(calc1, calc2));
        }
    }
}

五、进行操作测试