使用Moq:mock对象抛出'TargetParameterCountException'

Question

我是Moq的新手,所以希望我在这里错过了一些东西.出于某种原因,我得到一个TargetParameterCountException.

你能看出我做错了什么吗？任何问题？请问.:)

这是我的代码:

[Test]
  public void HasStudentTest_SaveToRepository_Then_HasStudentReturnsTrue()
  {
     var fakeStudents = new List<Student>();
     fakeStudents.Add(new Student("Jim"));

     mockRepository.Setup(r => r.FindAll<Student>(It.IsAny<Predicate<Student>>()))
                                .Returns(fakeStudents.AsQueryable<Student>)
                                .Verifiable();

     // in persistence.HasStudent(), repo.FindAll(predicate) is throwing 
     // 'TargetParameterCountException' ; not sure why
     persistence.HasStudent("Jim");
     mockRepository.VerifyAll();
  }

这是Persistence的HasStudent方法:

public bool HasStudent(string name)
  {
     // throwing the TargetParameterCountException
     var query = Repository.FindAll<Student>(s => s.Name == name); 

     if (query.Count() > 1)
        throw new InvalidOperationException("There should not be multiple Students with the same name.");

     return query.Count() == 1;
  }

Answer 1

这是问题的迟到但是为了Google员工......

我有一个非常类似的情况,我无法解释原因,但问题似乎是在.Returns()内的泛型List上调用AsQueryable.通过在模拟设置之前将List设置为IQueryable来解决问题.就像是...

var fakeList = new List<foo>.AsQueryable();
...
mockRepository.Setup(r => r.FindAll<foo>(It.IsAny<foo>()))
                            .Returns(fakeList)
                            .Verifiable();