使用Autofac为同一类中的内部方法编写Moq单元测试

本文关键字：方法 内部 单元测试 Moq 一类 Autofac 使用 | 更新日期: 2023-09-27 18:28:56

我正在同一个类中尝试mock内部方法。但我的嘲笑失败了。

这是我的密码。

接口

public interface IStudentService
{
    int GetRank(int studentId);
    IList<Subject> GetSubjects(int studentId);
}

实施

public class StudentService : IStudentService
{
    private readonly IStudentRepository _studentRepository;
    private readonly ISubjectRepository _subjectRepository;
    public StudentService(IStudentRepository studentRepository, ISubjectRepository subjectRepository)
    {
        _studentRepository = studentRepository;
        _subjectRepository = subjectRepository;
    }
    public int GetRank(int studentId)
    {
        IList<Subject> subjects = GetSubjects(studentId);
        int rank = 0;
        //
        //Calculate Rank
        //
        return rank;
    }
    public virtual IList<Subject> GetSubjects(int studentId)
    {
        return _subjectRepository.GetAll(studentId);
    }
}

单元测试

[TestFixture]
public class StudentServiceTest
{
    [SetUp]
    public void Setup()
    {
    }
    [TearDown]
    public void TearDown()
    {
    }
    [Test]
    public void GetRankTest()
    {
        using (var mock = AutoMock.GetStrict())
        {
            var mockStudentService = new Mock<IStudentService>();
            mockStudentService.Setup(x => x.GetSubjects(1)).Returns(new ServiceResponse<SystemUser>(new List<Subject>{ new AccounProfile(), new AccounProfile()}));
            mock.Provide(mockStudentService.Object);
            var component = mock.Create<StudentService>();
            int rank = component.GetRank(1);
            mockStudentService.VerifyAll();
            Assert.AreEqual(1, rank, "GetRank method fails");
        }
    }
}

当我调试代码时，它并不是在嘲笑GetSubjects方法。它实际上进入了这种方法的内部。我正在使用Nunit、Moq和Autofac编写单元测试。

提前感谢！

使用Autofac为同一类中的内部方法编写Moq单元测试

有两种解决方案。

1.部分嘲讽

在这种方法中，您创建正在测试的组件的mock（StudentService），并告诉Moq对其某些方法进行mock（要mock的GetSubjects-方法必须是虚拟的），同时将其他方法（GetRank）委托给基本实现：

设置mock.CallBase = true指示Moq将任何与显式Setup调用不匹配的调用委派给其基本实现。

// mockStudentService is not needed, we use partial mock
var service = mock.Create<StudentService>();
service.CallBase = true;
service.Setup(m => m.GetSubjects(1)).Returns(...);
var rank = service.GetRank(1);
// you don't need .VerifyAll call, you didn't not set any expectations on mock
Assert.AreEqual(1, rank, "GetRank method fails");

2.模拟内部服务（ISubjectRepository）

为特殊情况保留部分实物模型。你的情况很常见。您的组件（StudentService）可以依靠模拟的ISubjectRepository为其提供主题，而不是嘲笑自己：

using (var mock = AutoMock.GetStrict())
{
    var subjectRepositoryMock = new Mock<ISubjectRepository>();
    subjectRepositoryMock.Setup(x => x.GetSubjects(1)).Returns(...);
    mock.Provide(subjectRepositoryMock.Object);
    var component = mock.Create<StudentService>();
    int rank = component.GetRank(1);
    // verify is not needed once again
    Assert.AreEqual(1, rank, "GetRank method fails");
}

此代码适用于。感谢大家对的支持

[TestFixture]
public class StudentServiceTest
{
    private Mock<StudentRepository> _studentRepositoryMock;
    private Mock<SubjectRepository> _subjectRepositoryMock;
    private Mock<StudentService> _studentServiceMock;
    [SetUp]
    public void Setup()
    {
        _studentRepositoryMock = new Mock<StudentService>(MockBehavior.Strict);
        _subjectRepositoryMock = new Mock<SubjectRepository>(MockBehavior.Strict);
        _studentServiceMock = new Mock<StudentService>(_studentRepositoryMock.Object, _subjectRepositoryMock.Object);
        _studentServiceMock.CallBase = true;
    }
    [TearDown]
    public void TearDown()
    {
    }
    [Test]
    public void GetRankTest()
    {
        _studentServiceMock.Setup(x => x.GetSubjects(1)).Returns(...);
        int rank = component.GetRank(1);
        _studentServiceMock.VerifyAll();
        Assert.AreEqual(1, rank, "GetRank method fails");
    }
}

我想您的GetSubjects方法必须声明为virtual，否则它将无法被嘲笑。

public virtual IList<Subject> GetSubjects(int studentId)
{
   // code here
}
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