[英]Unit testing Entity Framework with Mock IDbSet
I've never really done unit testing before, and I've stumbled and tripped on my first test. 我以前从来没有真正做过单元测试,而且我在第一次测试时偶然发现并绊倒了。 The problem is that the
_repository.Golfers.Count();
问题是
_repository.Golfers.Count();
always indicates that the DbSet
is empty. 始终表示
DbSet
为空。
My test is simple, I'm just trying to add a new golfer 我的测试很简单,我只想添加一个新的高尔夫球手
[TestClass]
public class GolferUnitTest //: GolferTestBase
{
public MockGolfEntities _repository;
[TestMethod]
public void ShouldAddNewGolferToRepository()
{
_repository = new MockGolfEntities();
_repository.Golfers = new InMemoryDbSet<Golfer>(CreateFakeGolfers());
int count = _repository.Golfers.Count();
_repository.Golfers.Add(_newGolfer);
Assert.IsTrue(_repository.Golfers.Count() == count + 1);
}
private Golfer _newGolfer = new Golfer()
{
Index = 8,
Guid = System.Guid.NewGuid(),
FirstName = "Jonas",
LastName = "Persson"
};
public static IEnumerable<Golfer> CreateFakeGolfers()
{
yield return new Golfer()
{
Index = 1,
FirstName = "Bill",
LastName = "Clinton",
Guid = System.Guid.NewGuid()
};
yield return new Golfer()
{
Index = 2,
FirstName = "Lee",
LastName = "Westwood",
Guid = System.Guid.NewGuid()
};
yield return new Golfer()
{
Index = 3,
FirstName = "Justin",
LastName = "Rose",
Guid = System.Guid.NewGuid()
};
}
I've built a data model using Entity Framework and code-first. 我使用Entity Framework和代码优先构建了一个数据模型。 I've mocked an derived class for IDbSet in order to test my context (curtsy to people online that I can't remember exactly)
我已经为IDbSet嘲笑了一个派生类,以便测试我的上下文(对网上的人来说,我不记得确切)
public class InMemoryDbSet<T> : IDbSet<T> where T : class
{
readonly HashSet<T> _set;
readonly IQueryable<T> _queryableSet;
public InMemoryDbSet() : this(Enumerable.Empty<T>()) { }
public InMemoryDbSet(IEnumerable<T> entities)
{
_set = new HashSet<T>();
foreach (var entity in entities)
{
_set.Add(entity);
}
_queryableSet = _set.AsQueryable();
}
public T Add(T entity)
{
_set.Add(entity);
return entity;
}
public int Count(T entity)
{
return _set.Count();
}
// bunch of other methods that I don't want to burden you with
}
When I debug and step through the code I can see that I instantiate the _repository
and fill it with three faked golfers, but when I step out of the add function, the _respoistory.Golfers
is empty again. 当我调试并逐步执行代码时,我可以看到我实例化
_repository
并用三个伪造的高尔夫球手填充它,但是当我退出添加功能时, _respoistory.Golfers
再次为空。 when I add a new golfer, the _set.Add(entity)
runs and the golfer is added, but again _respoistory.Golfers
is empty. 当我添加一个新的高尔夫球手时,运行
_set.Add(entity)
并添加高尔夫球手,但是再次_respoistory.Golfers
为空。 What am I missing here? 我在这里错过了什么?
Update 更新
I'm sorry for being an idiot, but I hadn't implemented the set
on my MockGolfEntities
context. 我很抱歉是个白痴,但我没有在我的
MockGolfEntities
上下文中实现该set
。 The reason I had not is that I tried before but couldn't figure out how, moved on, and forgot about it. 我没有的原因是我之前尝试过,但无法弄清楚如何,继续前进和忘记它。 So, how do I set an
IDbSet
? 那么,我该如何设置
IDbSet
? This is what I've tried, but it gives me a Stack Overflow error. 这是我尝试过的,但它给了我一个Stack Overflow错误。 I feel like an idiot, but I can't figure out how to write the set function.
我觉得自己像个白痴,但我无法弄清楚如何编写set函数。
public class MockGolfEntities : DbContext, IContext
{
public MockGolfEntities() {}
public IDbSet<Golfer> Golfers {
get {
return new InMemoryDbSet<Golfer>();
}
set {
this.Golfers = this.Set<Golfer>();
}
}
}
You shouldn't need to implement the get/set, the following code should be enough to generate the context for you. 您不需要实现get / set,以下代码应该足以为您生成上下文。
public class MockGolfEntities : DbContext, IContext
{
public MockGolfEntities() {}
public IDbSet<Golfer> Golfers { get; set;}
}
I've implemeted the code you had in your original post and everything seemed to work well for me - where did you get the source for the InMemoryDbSet? 我已经实现了原始帖子中的代码,一切似乎都适合我 - 你在哪里获得了InMemoryDbSet的源代码? I'm using the NuGet package 1.3 , maybe you should try that version?
我正在使用NuGet包1.3 ,也许你应该尝试那个版本?
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