单元测试实体框架与模拟IDbSet [英] Unit testing Entity Framework with Mock IDbSet
问题描述
我从来没有真正做过单元测试之前,我已经迷迷糊糊地绊倒在我的第一次测试。问题是,在 _repository.Golfers.Count();
总是指示 DbSet
是空的。
我的测试很简单,我只是想添加一个新的高尔夫球手
[识别TestClass]
公共类GolferUnitTest //:GolferTestBase
{
公共MockGolfEntities _repository; [测试方法]
公共无效ShouldAddNewGolferToRepository()
{
_repository =新MockGolfEntities(); _repository.Golfers =新InMemoryDbSet&所述;高尔夫球>(CreateFakeGolfers()); 诠释计数= _repository.Golfers.Count();
_repository.Golfers.Add(_newGolfer); Assert.IsTrue(_repository.Golfers.Count()==计数+ 1);
} 私人高尔夫球_newGolfer =新高尔夫()
{
索引= 8,
GUID = System.Guid.NewGuid(),
名字=乔纳斯
姓氏=佩尔松
};
公共静态的IEnumerable<高尔夫球员GT; CreateFakeGolfers()
{
产量返回新高尔夫()
{
索引= 1,
名字=条例,
姓氏=克林顿,
GUID = System.Guid.NewGuid()
};
产量返回新高尔夫()
{
索引= 2,
名字=李,
姓氏=维斯特伍德
GUID = System.Guid.NewGuid()
};
产量返回新高尔夫()
{
索引= 3,
名字=贾斯汀,
姓氏=玫瑰,
GUID = System.Guid.NewGuid()
};
}
我已经建立了使用实体框架和code-第一个数据模型。我嘲笑IDbSet一个派生类中,以(网上行屈膝礼的人,我记不太清了)测试我的上下文
公共类InMemoryDbSet< T> :IDbSet< T>其中T:类
{
只读的HashSet< T> _组;
只读的IQueryable< T> _queryableSet; 公共InMemoryDbSet():这个(Enumerable.Empty< T>()){} 公共InMemoryDbSet(IEnumerable的< T>实体)
{
_set =新的HashSet< T>(); 的foreach(在实体VAR实体)
{
_set.Add(实体);
} _queryableSet = _set.AsQueryable();
} 市民不要再增加(T实体)
{
_set.Add(实体);
返回实体; } 公众诠释计数(T实体)
{
返回_set.Count();
} //其他方法一堆,我不想给你添麻烦
}
当我调试,并逐步完成了code我可以看到我实例化 _repository
并用三个填充伪造的球手,但是当我走出的添加功能, _respoistory.Golfers
又是空的。当我添加一个新的球员,在 _set.Add(实体)
运行和高尔夫球手被添加,但同样 _respoistory.Golfers
是空的。我缺少的是在这里吗?
更新
我是一个傻瓜抱歉,但我没有执行设置
我的 MockGolfEntities
背景。我没有的原因是,我尝试过,但无法弄清楚如何,感动,并忘了。所以,我怎么设置 IDbSet
?这是我尝试过,但它给了我一个堆栈溢出错误。我觉得自己像个白痴,但我无法弄清楚如何写设置功能。</ P>
公共类MockGolfEntities:的DbContext,IContext
{
公共MockGolfEntities(){} 公共IDbSet&LT;高尔夫球员GT;高尔夫球手{
获得{
返回新InMemoryDbSet&LT;高尔夫球员GT;();
}
集合{
this.Golfers = this.Set&LT;高尔夫球员GT;();
}
}
}
您不应该需要实现的get / set,下面code应该足以产生的背景为您服务。
公共类MockGolfEntities:的DbContext,IContext
{
公共MockGolfEntities(){} 公共IDbSet&LT;高尔夫球员GT;高尔夫球手{搞定;组;}}
我Implemeted一个在code你在原来的职位了,一切都似乎很适合我的工作 - 从哪里弄来的InMemoryDbSet源?我使用的是的NuGet包1.3 ,也许你应该尝试的版本?
I've never really done unit testing before, and I've stumbled and tripped on my first test. The problem is that the _repository.Golfers.Count();
always indicates that the DbSet
is empty.
My test is simple, I'm just trying to add a new golfer
[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. I've mocked an derived class for IDbSet in order to test my context (curtsy to people online that I can't remember exactly)
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. when I add a new golfer, the _set.Add(entity)
runs and the golfer is added, but again _respoistory.Golfers
is empty. What am I missing here?
Update
I'm sorry for being an idiot, but I hadn't implemented the set
on my MockGolfEntities
context. The reason I had not is that I tried before but couldn't figure out how, moved on, and forgot about it. So, how do I set an IDbSet
? This is what I've tried, but it gives me a Stack Overflow error. I feel like an idiot, but I can't figure out how to write the set function.
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.
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? I'm using the NuGet package 1.3, maybe you should try that version?
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