C#单元测试用例的使用方法

谁践踏了优雅 2023-02-20 02:39 79阅读 0赞

当我们写好一段代码后，我们不能一直在这段代码集中写实行的例子，需要自己构建单元测试用例，操作步骤如下：

在解决方案中新建项目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5NjYwOTU3_size_16_color_FFFFFF_t_70][]

使用xunit这个工具来建立单元测试。

这里写一段机器内部依靠电池供电量来运转的情况。

using System;
    
    namespace UnitTestExample
    {
       public class Program
        {
            static void Main(string[] args)
            {
                DeskFan desk = new DeskFan(new engine());
                Console.WriteLine(desk.Work());
            }
        }
        public interface IPowerSupply
        {
            int PowerSupply();
        }
        public class engine : IPowerSupply
        {
            public int PowerSupply()
            {
                return 110;
            }
        }
        public class sumsang : IPowerSupply
        {
            public int PowerSupply()
            {
                return 220;
            }
        }
        public class DeskFan
        {
            private IPowerSupply _powersupply;
            public DeskFan(IPowerSupply powersupply)
            {
                _powersupply = powersupply;
            }
            public string Work()
            {
                int power = _powersupply.PowerSupply();
                if (power <= 0)
                {
                    return "Won't work";
                }else if (power<100){
                    return "Slow";
                }else if (power < 200)
                {
                    return "Work fine";
                }
                return "warning!";
            }
        }
    
    }

单元测试构建如下

using System;
    using Xunit;
    using UnitTestExample;
    using Moq;
    
    namespace XUnitTestProject
    {
        public class UnitTest1
        {
            [Fact]
            public void Test1()
            {
                var desk = new DeskFan(new powerlowerthan());
                var target = "Won't work";
                var actual = desk.Work();
                Assert.Equal(target, actual);
            }
            [Fact]
            public void Test2()
            {
                var Mock = new Mock<IPowerSupply>();
                Mock.Setup(ps => ps.PowerSupply()).Returns(() => 200);
                var desk = new DeskFan(Mock.Object);
                var target = "warning!";
                var actual = desk.Work();
                Assert.Equal(target, actual);
            }
        }
        public class powerlowerthan : IPowerSupply
        {
            public int PowerSupply()
            {
                return 0;
            }
        }
    
    }

可以看到有两种写法，第一种是自己写类去进行测试，另外一种是根据工具Moq来自己创建测试类，推荐使用Moq，比较简洁。

Moq下载方式：右键解决方案->管理解决方案的Nuget程序包，然后在里面搜索Moq，安装即可。

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