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>();
}
}
}
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