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NET using Moq open source simulation library to simplify unit testing

Popularity：686 ℃/2024-10-28 08:18:06

preamble

NET open source , popular and easy to use .NET simulation library to recommend today Dajao :Moq。

Introduction to the Moq Class Library

Moq is an open source, popular, easy-to-use .NET simulation library that takes full advantage of .NET's Linq expression trees and lambda expressions. This makes Moq the most productive, type-safe, and refactorable simulation library available. It supports not only simulation interfaces, but also simulation classes. The API is very simple and intuitive and does not require any prior knowledge or experience with simulation concepts. This simplifies dependency management and validation in unit testing, and improves code testability and maintainability.

Creating a Console Application

First we create a file named:MoqExercise NET 8 console application:

Installing Moq NuGet

Creating Simulation Objects

Here is a simple example showing how to use Moq to quickly create a mock object of IUserInfo:

    public interface IUserInfo
    {
        string UserName { get; set; }
        int Age { get; set; }

        string GetUserData();
    }

    public static void UserInfoTest()
    {
        // Create a mock object of IUserInfo.
        var mockUserInfo = new Mock<IUserInfo>();

        // Set the values of the properties of the simulation object
        (u => , "Da Yao").
        (u => , 27);

        // Set the return value of the GetUserData method.
        (u => ()).Returns("UserName: Daiyao, Age: 25").

        // Get an instance of the simulation object
        var userInfo = ;

        // Call the method and output the result
        (());
        ("UserName: {0}, Age: {1}", , );
    }

Validating the parameters of a call

In unit testing, it is also very important to validate the call parameters of the methods. the Moq framework provides the Verify method to help developers can easily validate these aspects.

    public interface IVerifyService
    {
        void Process(int value);
    }

    public class VerifyServiceClient
    {
        private readonly IVerifyService _service;

        public VerifyServiceClient(IVerifyService service)
        {
            _service = service;
        }

        public void Execute(int[] values)
        {
            foreach (var value in values)
            {
                _service.Process(value);
            }
        }
    }

        public static void VerifyTest()
        {
            // Create simulation objects
            var serviceMock = new Mock<IVerifyService>();

            // Create the object under test and inject the mock object
            var serviceClient = new VerifyServiceClient();

            // Execute the test
            ([1, 2, 3]);

            // Validate the number of method calls and parameters
            (x => (1));
            (x => (3));
            (x => (2));
            //(x => (12)); //an exception is thrown here, indicating that the validation failed

            // If you get this far without throwing an exception, the validation passes.
            ("Authentication passed!") ;
        }

Simulating Thrown Exceptions

When using the Moq framework in unit testing, you can simulate the methods of an interface throwing exceptions.

        public static void TestThrowException()
        {
            // Create a mock object of IUserInfo.
            var mockUserInfo = new Mock<IUserInfo>();

            // Set the GetUserData method to throw an exception when called.
            (x => ()).Throws(new Exception("Exception simulated"));;

            // Get an instance of the simulation object
            var userInfo = ();
        }

Project source code address

More useful features and characteristics of the project welcome to the project open source address to view 👀, do not forget to give the project a Star support 💖.

  • Open source address:/devlooped/moq
  • MoqExercise：/YSGStudyHards/DotNetExercises/tree/master/MoqExercise

A selection of great projects and frameworks

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  • GitHub open source address:/YSGStudyHards/DotNetGuide/blob/main/docs/DotNet/
  • Gitee open source address:/ysgdaydayup/DotNetGuide/blob/main/docs/DotNet/

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