c# unit test example (learn teacher Liu video)

c# unit test

Items to be tested:

namespace LambdaTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var fan = new DeskFan(new PowerSupply());
            Console.WriteLine(fan.Work());

        }
    }

    public interface IPowerSupply
    {
        int GetPower();
    }

    public class PowerSupply : IPowerSupply
    {
        public int GetPower()
        {
            return 170;
        }
    }

    public class DeskFan
    {
        private IPowerSupply _powerSupply;
        public DeskFan(IPowerSupply powerSupply)
        {
            _powerSupply = powerSupply;
        }

        public string Work()
        {
            int power = _powerSupply.GetPower();

            if (power <= 120)
            {
                return "Low Voltage";
            }
            else if (power >= 200)
            {
                return "Over Voltage";
            }
            else
            {
                return "Fine Power";
            }
        }
    }
}

Unit test steps

Right-click Solution, select Add, new project:

select Unit Test or xUnit Test:

fill in the project name, click Create:

add a reference

to the project to be tested: select the project:

Write unit test code:

namespace InterfaceExample_UnitTest
{
    [TestClass]
    public class TestExample
    {
        [TestMethod]
        public void PowerLower()
        {
            var fan = new DeskFan(new PowerLowerExample());
            var expected = "Low Voltage";
            var actual = fan.Work();
            Assert.AreEqual(expected, actual);
        }

        [TestMethod]
        public void PowerHigher()
        {
            var fan = new DeskFan(new PowerHigherExample());
            var expected = "Over Voltage";
            var actual = fan.Work();
            Assert.AreEqual(expected, actual);
        }

        class PowerLowerExample : IPowerSupply
        {
            int IPowerSupply.GetPower()
            {
                return 80;
            }
        }

        class PowerHigherExample : IPowerSupply
        {
            int IPowerSupply.GetPower()
            {
                return 240;
            }
        }
    }
}

Open Test Explore, view,

right-click case, Run, and view the running results: The

above solution structure:

Use mork to simplify unit test writing

Mork can omit tedious interface definitions like the following:

The process is recorded as follows:

Right-click the project, select Manage NuGet Packages

and search for Moq in Browse:

select, click Install:

select OK:

installation is complete:

return to the test project, modify the code: