Question

我在模拟一个名为Query的方法时遇到问题，该方法返回一个IQueryable接口，我不知道为什么。

我尝试用Moq框架模拟的方法：

public class ObjectContextRepository : IObjectContextRepository
    {
        .....
        private ObjectContext _objectContext = null;      
        public IQueryable<TEntity> Query<TEntity>() where TEntity : class
        {
// Moq Setup doesn't work and debugger enters this code:
            return ObjectContext.CreateObjectSet<TEntity>();
        }
...
}

测试示例：

ObjectContextRepositoryFactory = new Mock<IObjectContextRepositoryFactory>();
ObjectContextRepositoryFactory.Setup(x => x.NewInstance(false))
                                          .Returns(new ObjectContextRepository(It.IsAny<string>()));

CurrencyRateManager = new CurrencyRateManager(new ObjectContextRepositoryFactory("connection"));

ObjectContextRepository = new Mock<IObjectContextRepository>();
CurrencyExchangeRate rate1 = new CurrencyExchangeRate {EXCHANGE_DATE = new DateTime(2012, 09, 07)};
CurrencyExchangeRate rate2 = new CurrencyExchangeRate {EXCHANGE_DATE = new DateTime(2012, 09, 06)};

IList<CurrencyExchangeRate> list = new List<CurrencyExchangeRate> { rate1, rate2 };

// I wait that Query() method will return me  a list with rates. 
ObjectContextRepository.Setup(x => x.Query<CurrencyExchangeRate>()).Returns(list.AsQueryable());

using (IObjectContextRepository context = ObjectContextRepositoryFactory.Object.NewInstance())
            {
// Mock doesn't work and debugger enters custom method context.Query<>() and throws an exception
var maxDateQuery = context.Query<CurrencyExchangeRate>()
                    .Where(c => c.EXCHANGE_DATE < new DateTime(2012, 09, 07));
            }

PS。是的，我知道，我必须使用集成测试，但这是我的任务。

Answer 1

您的工厂返回new ObjectContextRepository(It.IsAny<string>())而不是您的模拟（后来甚至定义为您的工厂）。所以你的测试是针对真正的实现而不是模拟的。

顺便说一句，在It.IsAny<string>()内使用Returns没有任何意义，它什么也没做。

Answer 2

有时停止探索问题并发布问题非常有效。答案很快就来了......

原因在于Mocked对象的Object属性。我变了

ObjectContextRepositoryFactory = new Mock<IObjectContextRepositoryFactory>();
ObjectContextRepositoryFactory.Setup(x => x.NewInstance(false))
                                          .Returns(new ObjectContextRepository(It.IsAny<string>()));

CurrencyRateManager = new CurrencyRateManager(new ObjectContextRepositoryFactory("connection"));

要

        ObjectContextRepository = new Mock<IObjectContextRepository>();

        ObjectContextRepositoryFactory = new Mock<IObjectContextRepositoryFactory>();
        ObjectContextRepositoryFactory.Setup(x => x.NewInstance(false))
                                      .Returns(**ObjectContextRepository.Object**);

        CurrencyRateManager = new CurrencyRateManager(**ObjectContextRepositoryFactory.Object**);

它有效。

Moq设置不适用于接口方法，并使用IQueryable结果输入moqed方法

2 个答案: