I am unit testing code written against the ADO .NET Entity Framework. I would like to populate an in-memory database with rows, and make sure that my code retrieves them properly.
I can mock the Entity Framework using Rhino Mocks, but that would not be sufficient. I would be telling the query what entities to return to me. This would neither test the where clause nor the .Include() statements. I want to be sure that my where clause matches only the rows I intend, and no others. I want to be sure that I have asked for the entities that I need, and none that I don't.
For example:
class CustomerService
{
ObjectQuery<Customer> _customerSource;
public CustomerService(ObjectQuery<Customer> customerSource)
{
_customerSource = customerSource;
}
public Customer GetCustomerById(int customerId)
{
var customers = from c in _customerSource.Include("Order")
where c.CustomerID == customerId
select c;
return customers.FirstOrDefault();
}
}
If I mock the ObjectQuery to return a known customer populated with orders, how do I know that CustomerService has the right where clause and Include? I would rather insert some customer rows and some order rows, then assert that the right customer was selected and the orders are populated.
An InMemory provider is included in EF7 (pre-release).
You can use either the NuGet package, or read about it in the EF repo on GitHub (view source).