c# - 使用 Moq 安排单元测试

Question

我创建了一个名为 ListOfPeople 的方法，并尝试为其编写一个单元测试。目前，我在设置单元测试 的Arrange 部分时遇到问题。我现在无法运行它，因为我的 PeopleId 和 PersonGroupJobId 状态为 Cannot resolve symbol。

Question: How can I test this method successfully?

我的方法:

public IEnumerable<Person> ListOfPeople(int personId, int? jobId)
        {
            var people = _unitOfWork.GetRepository<DB.Person>().GetAll()
              .Where(p => p.PeopleGroups.Any(m => m.PeopleId == personId 
                              && m.PersonGroupdJobId == jobId));

            if (!people.Any())
                return new List<Person>();

            var personData = people.Select(p => new Person
            {
                Id = p.PersonId,
                Name = p.PersonName,
                WorkTypeId = p.WorkTypeId,
                PrimaryLanguage = p.PrimaryLanguage,
                PeopleGroups = p.PeopleGroups.ToList()
                  .Select(pp => new PeopleGroup
                  {
                      Id = pp.ProjectPartyId,
                      PeopleId = pp.PeopleId,
                      JobId = pp.PersonGroupJobId ?? 0,
                      AddressId = pp.AddressId
                  })
            }).ToList();

            return personData;
        }

单元测试:

[TestMethod]
    public void ListOfPeople_peopleExist_returnsList()
    {
        // Arrange
        var people = new List<DB.Person>
        {    
            PeopleId = It.IsAny<int>(),
            PersonGroupdJobId = It.IsAny<int>()
        }; 

        _uowMock
            .Setup(mock => mock.GetRepository<DB.Person>().GetAll())
            .Returns(people.AsQueryable());

        // Act
        var result = _repository.ListOfPeople(It.IsAny<int>(), It.IsAny<int>());

        // Assert
        Assert.IsNotNull(result);
        Assert.AreEqual(2, result.Count());

        _unitOfWork.Verify(mock => mock.Commit(), Times.Never());
        _unitOfWork.Verify(mock => mock.GetRepository<DB.Person>().GetAll(), Times.Once());
    }

Answer 1

您没有使用 Moq's It匹配器正确。匹配器旨在用于最小起订量的 Setup和 Verify调用(例如 see here 的用法)

• 在安排中，你不应该使用 It.IsAny在创建虚假数据时。 It.IsAny<> 将会发生的一切是这些值将被分配 default(Type) ，即整数等为零，这不会有用。

var people = new List<DB.Person>
 {
   new DB.Person
   {        
       PeopleId = 1234, // Some traceable value and NOT It.IsAny<int>(),
       PersonGroupdJobId = 987,
       ...

• 在 act 步骤中，您需要使用执行场景的值调用被测方法(同样，不仅仅是 It.IsAny<> ):

var result = _repository.ListOfPeople(1234, 567); // Filters matching your test scenario

此外，由于被测试的方法至少有两个问题，即对存储库应用过滤器，然后将一个 DB 实体映射到另一个 POCO，您需要提供一组完整的输入数据，以便您可以证明所有输入字段都映射到输出字段。

如果将所有这些放在一起，您的单元测试将类似于:

[Test]
public void ListOfPeople_peopleExist_returnsList()
{
    // Arrange : Generate fake data
    var people = new List<DB.Person>
    {    
        new DB.Person
        {
            PersonId = 123,
            PersonName = "Bob",
            PrimaryLanguage = "French",
            WorkTypeId = 987,
            PeopleGroups = new []
            {
                new DB.PeopleGroup
                {
                    AddressId = 123,
                    PersonGroupJobId = 999,
                    PeopleId = 123, // Match the parent ID
                    ProjectPartyId = 3
                }
            }
        }
    };

    // Your _unitOfWork and _repository mocks seem to be class private fields
    var _unitOfWork = new Mock<IUnitOfWork>();

    _unitOfWork
        .Setup(mock => mock.GetRepository<DB.Person>().GetAll())
        .Returns(people.AsQueryable());

    var _repository = new MyRepo(_unitOfWork.Object);

    // Act
    var result = _repository.ListOfPeople(123, 999);

    // Assert
    Assert.IsNotNull(result);
    Assert.AreEqual(1, result.Count(r => r.Name == "Bob" 
                                         && r.Id == 123 
                                         && r.PeopleGroups.First().Id == 3));
  //... etc - ensure all the fields are mapped 

    _unitOfWork.Verify(mock => mock.Commit(), Times.Never());
    _unitOfWork.Verify(mock => mock.GetRepository<DB.Person>().GetAll(), 
                       Times.Once());
}