问题描述
我正在创建一个公开IQueryable的存储库.在我的单元测试中最好的模拟方法是什么?
I am creating a repository that exposes IQueryable. What is the best way to mock this out for my unit testing?
由于我将RhinoMocks用于其余的模拟对象,因此我尝试执行以下操作:
Since I am using RhinoMocks for the rest of my mock objects, I tried to do the following:
IQueryable<MyObject> QueryObject =
MockRepository.GenerateStub<IQueryable<MyObject>>();
虽然这不起作用,所以我尝试这样做:
This doesn't work though so I tried doing this:
IQueryable<MyObject> QueryObject =
(new List<MyObject> { new MyObject() }).AsQueryable();
是否有更好的方法可以做到这一点,或者是否有任何其他模拟框架内置了对IQueryable的支持?
Is there a better way to do this, or have any other mocking frameworks built support for IQueryable in?
我的存储库界面如下:
public interface IRepository<T> where T : TableServiceEntity
{
IQueryable<T> Table { get; }
void Attach(T existingItem);
void Delete(T itemToDelete);
void Insert(T newItem);
T Load(string partitionKey, string rowKey);
IEnumerable<T> Load(string partitionKey);
IEnumerable<T> Query(IQueryable<T> query);
IEnumerable<T> Last(int count);
T Last();
void Update(T item);
}
这是我要测试的方法:
public Post LoadPost(int year, int month, int day, string slug)
{
var query = from p in _blogRepository.Table
where
p.PartitionKey == Key.Partition(year, month, day)
&& p.Slug == slug
select p;
var posts = _blogRepository.Query(query.Take(1));
return posts.First();
}
这是我现在要进行的测试,它将测试LoadPost.
Then here is the test as I have it right now that will test LoadPost.
[Fact]
public void LoadWillRetrieveByPartitionKeyAndRowKeyWhenUsingUriFormat()
{
Repository
.Stub(x => x.Query(Arg<IQueryable<Post>>.Is.Anything))
.Return(new List<Post> {_post});
var result = Service.LoadPost(
_post.Year(),
_post.Month(),
_post.Day(),
_post.Slug);
Assert.NotNull(result);
}
该代码来自我的 AzureBlog 项目.
推荐答案
我通常会完全按照您最终在测试中所做的来做.在编写测试时,我假设.Net库类可以正常工作,并且不包含错误,因此可以在测试中使用它们.当我需要测试列表,集合,可查询的字典等时,我只需创建真实的东西并填充测试数据即可.它使测试的可读性和编写速度更快,并且老实说,这种风险不存在.
I usually do exactly what you ended up doing in your test. When writing my tests I assume that the .Net library classes work correctly and don't contain bugs, so I can use them in the tests. When I need a test list, collection, queryable, dictionary, etc. I just create the real thing and populate with test data. It makes the tests much more readable and quicker to write, and to be honest the risk is non-existent.
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