Mocking a DbSet don't work for find method

[Iman]

Hi Telerik,
In JustMock documents (Entity Framework Mocking) you use :

IList<Dinner> FakeDinners()

And then :

Mock.Arrange(() => nerdDinners.Dinners).ReturnsCollection(FakeDinners());
to mock a DbSet. The problem is where I use " DbContext.DbSet<Dinner>.Find(2) " which gets from context or database the entity with primary key equal to 2.
But in my test where I pass the FakeDinners() ,it doesn't work and return null. Looks like it doesn't know primary key in 
FakeDinners() as it is list. So what is solution?

[Kaloyan]

Hi Iman,

In this case, you can directly arrange the behavior of the Find() method, like this:

[TestMethod]
public void ShouldReturnFakeCollectionWhenExpected()
{
    NerdDinners nerdDinners = new NerdDinners();

    // Arrange
    Mock.Arrange(() => nerdDinners.Dinners.Find(2)).Returns(FakeDinners().FirstOrDefault());

    // Act
    var query = nerdDinners.Dinners.Find(2);

    // Assert
    Assert.AreEqual(1, query.DinnerID);
}

I hope this helps. Let me know if I can assist you further.

Regards,
Kaloyan
Telerik

[Iman]

OK, I was thinking there is a better (smarter/automated) way to do this. anyway thanks for your replay.