如何模拟IFindFluent接口 [英] How to mock IFindFluent interface
问题描述
我正在用mongo db编写单元测试,我需要测试以某种方式处理从mongo返回的数据的方法.例如方法
I am writing unit tests with mongo db and I need to test somehow methods that works with data returned from mongo. For example method
IFindFluent<Transcript, Transcript> GetTranscriptByUserId(int userId);
应返回一些成绩单.但是,它返回的接口具有几个道具-Filter
,Options
,Sort
等.
Should return some transcript. But instead it returns interface that has couple of props - Filter
, Options
, Sort
, and other.
我要测试Paginator<T>
类的方法Paginane
public PaginatedObject<T> Paginate(IFindFluent<T,T> items, int limit, int page)
{
if (limit == 0)
{
limit = 10;
}
int count = (int)items.Count();
var lastPage = (count / limit) + 1;
if (page <= 0)
{
page = 1;
}
if (page > lastPage)
{
page = lastPage;
}
var request = items.Skip((page - 1) * limit).Limit(limit);
var itemsToReturn = request.ToList();
var pages = new PaginatedObject<T>
{
Entries = itemsToReturn,
Limit = limit,
Total = count,
Page = page
};
return pages;
}
第一个参数是接口IFindFluent<T,T>
项.因此,当我调用Count
,Skip
和Limit
时,我应该模拟它以返回项目.但是这些方法很容易被嘲笑.
First param is interface IFindFluent<T,T>
items. So, I should mock it to return items when I call Count
, Skip
and Limit
. But these methods could be easily mocked.
mockIfindFluent = new Mock<IFindFluent<Transcript, Transcript>>();
mockIfindFluent.Setup(s => s.Limit(It.IsAny<int>())).Returns(mockIfindFluent.Object);
mockIfindFluent.Setup(i => i.Skip(It.IsAny<int>())).Returns(mockIfindFluent.Object);
mockIfindFluent.Setup(i => i.Count(CancellationToken.None)).Returns(3);
我打电话给ToList()
时遇到的真正问题.
Real problem I have when I call ToList()
.
我有一个例外,我无法模拟不属于模型的属性,依此类推.
I got exception that I can not mock property that does not belong to model and so on.
推荐答案
从以下 https:中汲取灵感: //gist.github.com/mizrael/a061331ff5849bf03bf2 和对我有用的扩展实现.我创建了IFindFluent接口的虚假实现,并且它依赖于IAsyncCursor接口,因此我也对该接口进行了虚假实现,并使用该虚假实现作为我想设置的模拟方法的回报.在该伪造的实现中,我已经初始化了一个可枚举的对象,并以我正在使用的方法将其返回.您仍然可以更有创造力,可以随心所欲地返回.到目前为止,这对我有用.
Took some inspiration from this https://gist.github.com/mizrael/a061331ff5849bf03bf2 and extended implementation which worked for me. I have created a fake implementation of the IFindFluent interface and it had a dependency on the IAsyncCursor interface, so I did a fake implementation of that also and using that in return of mock method I wanted to set up. In that fake implementation, I have initialized an enumerable and returned that in a method I am using. You can still be more creative and play around whatever you want to return. So far this worked for me.
这是一个伪造的实现.
public class FakeFindFluent<TEntity, TProjection> : IFindFluent<TEntity, TEntity>
{
private readonly IEnumerable<TEntity> _items;
public FakeFindFluent(IEnumerable<TEntity> items)
{
_items = items ?? Enumerable.Empty<TEntity>();
}
public FilterDefinition<TEntity> Filter { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
public FindOptions<TEntity, TEntity> Options => throw new NotImplementedException();
public IFindFluent<TEntity, TResult> As<TResult>(MongoDB.Bson.Serialization.IBsonSerializer<TResult> resultSerializer = null)
{
throw new NotImplementedException();
}
public long Count(CancellationToken cancellationToken = default)
{
throw new NotImplementedException();
}
public Task<long> CountAsync(CancellationToken cancellationToken = default)
{
throw new NotImplementedException();
}
public long CountDocuments(CancellationToken cancellationToken = default)
{
throw new NotImplementedException();
}
public Task<long> CountDocumentsAsync(CancellationToken cancellationToken = default)
{
throw new NotImplementedException();
}
public IFindFluent<TEntity, TEntity> Limit(int? limit)
{
throw new NotImplementedException();
}
public IFindFluent<TEntity, TNewProjection> Project<TNewProjection>(ProjectionDefinition<TEntity, TNewProjection> projection)
{
throw new NotImplementedException();
}
public IFindFluent<TEntity, TEntity> Skip(int? skip)
{
throw new NotImplementedException();
}
public IFindFluent<TEntity, TEntity> Sort(SortDefinition<TEntity> sort)
{
throw new NotImplementedException();
}
public IAsyncCursor<TEntity> ToCursor(CancellationToken cancellationToken = default)
{
throw new NotImplementedException();
}
public Task<IAsyncCursor<TEntity>> ToCursorAsync(CancellationToken cancellationToken = default)
{
IAsyncCursor<TEntity> cursor = new FakeAsyncCursor<TEntity>(_items);
var task = Task.FromResult(cursor);
return task;
}
}
public class FakeAsyncCursor<TEntity> : IAsyncCursor<TEntity>
{
private IEnumerable<TEntity> items;
public FakeAsyncCursor(IEnumerable<TEntity> items)
{
this.items = items;
}
public IEnumerable<TEntity> Current => items;
public void Dispose()
{
//throw new NotImplementedException();
}
public bool MoveNext(CancellationToken cancellationToken = default)
{
throw new NotImplementedException();
}
public Task<bool> MoveNextAsync(CancellationToken cancellationToken = default)
{
return Task.FromResult(false);
}
}
这是我设置模拟方法以返回单元测试所需内容的方法.
Here is how I set up my mock method to return what I wanted for my unit testing.
mockParticipantRepository
.Setup(x => x.FindByFilter(It.IsAny<FilterDefinition<Participant>>()))
.Returns(new FakeFindFluent<Participant, Participant>(participantsByRelation));
我希望这会有所帮助.
I hope this is helpful.
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