如何为使用AutoMapper和依赖注入的.net core 2.0服务编写xUnit测试? [英] How to Write xUnit Test for .net core 2.0 Service that uses AutoMapper and Dependency Injection?

问题描述

我是.net核心/C#编程的新手(来自Java)

I'm new to .net core/C# programming (coming over from Java)

我有以下Service类，该类使用依赖项注入来获取AutoMapper对象和数据存储库对象，以用于创建SubmissionCategoryViewModel对象的集合:

I have the following Service class the that uses dependency injection to get an AutoMapper object and a data repository object for use in creating a collection of SubmissionCategoryViewModel objects:

public class SubmissionCategoryService : ISubmissionCategoryService
{

    private readonly IMapper _mapper;

    private readonly ISubmissionCategoryRepository _submissionCategoryRepository;

    public SubmissionCategoryService(IMapper mapper, ISubmissionCategoryRepository submissionCategoryRepository)
    {

        _mapper = mapper;

        _submissionCategoryRepository = submissionCategoryRepository;

    }

    public List<SubmissionCategoryViewModel> GetSubmissionCategories(int ConferenceId)
    {


        List<SubmissionCategoryViewModel> submissionCategoriesViewModelList = 
            _mapper.Map<IEnumerable<SubmissionCategory>, List<SubmissionCategoryViewModel>>(_submissionCategoryRepository.GetSubmissionCategories(ConferenceId) );

        return submissionCategoriesViewModelList;


    }
}

我正在使用Xunit编写单元测试.我无法弄清楚如何为方法GetSubmissionCategories编写单元测试，并让我的测试类提供IMapper实现和ISubmissionCategoryRepository实现.

I'm writing my unit tests using Xunit. I cannot figure out how to write a unit test for method GetSubmissionCategories and have my test class supply an IMapper implementation and a ISubmissionCategoryRepository implementation.

到目前为止，我的研究表明我可以创建依赖对象的测试实现(例如SubmissionCategoryRepositoryForTesting)，也可以使用模拟库来创建依赖关系接口的模拟.

My research so far indicates that I could either create a test implementation of the dependent objects (e.g. SubmissionCategoryRepositoryForTesting) or I can use a mocking library to create a mock of the dependency interface.

但是我不知道如何创建AutoMapper的测试实例或AutoMapper的模拟.

But I don't know how I would create a test instance of AutoMapper or a mock of AutoMapper.

如果您知道任何优秀的在线教程，其中详细介绍了如何创建单元测试，其中要测试的类使用AutoMapper和依赖项注入来存储数据仓库，那就太好了.

If you know of any good online tutorials that walk through in detail how to create a unit test where the class being tested uses AutoMapper and dependency injection for a data repository that would be great.

谢谢您的帮助.

推荐答案

此代码段应为您提供一个开端:

This snippet should provide you with a headstart:

[Fact]
public void Test_GetSubmissionCategories()
{
    // Arrange
    var config = new MapperConfiguration(cfg =>
    {
        cfg.AddProfile(new YourMappingProfile());
    });
    var mapper = config.CreateMapper();
    var repo = new SubmissionCategoryRepositoryForTesting();
    var sut = new SubmissionCategoryService(mapper, repo);

    // Act
    var result = sut.GetSubmissionCategories(ConferenceId: 1);

    // Assert on result
}

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