asp.net mvc - How to use Moq with Entity Framework IDbSet Count() etc. methods -

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i'm trying use moq make tests entity framework code first classes. i'm new moq , mocking techniques , wonder if it's possible test describe below. searched through web solutions, based on repository pattern, want avoid.

i have itestentities interface context

public interface itestentities {     idbset<order> orders { get; }     idbset<product> products { get; }     idbset<user> users { get; } }

then context

public class testentities : dbcontext, itestentities {     public testentities() : base("name=testentities")     {      }      public virtual idbset<order> orders { get; set; }     public virtual idbset<product> products { get; set; }     public virtual idbset<user> users { get; set; } }

a controller , action test

public class homecontroller : controller {     private itestentities db;      public homecontroller()     {         db = new testentities();     }      public homecontroller(itestentities db)     {         this.db = db;     }      public actionresult index()     {         var count = db.users.count();         viewbag.count = count;          return view(count);     }         }

and nunit test using moq 

[test] public void modelvalueshouldbetwo() {     var mockusers = new mock<idbset<user>>();     mockusers.setup(m => m.count()).returns(2);      var mockdb = new mock<itestentities>();     mockdb.setup(db => db.users).returns((idbset<user>)mockusers);      var controller = new homecontroller((itestentities)mockdb);      var view = controller.index();      assert.isinstanceof<viewresult>(view);     assert.areequal(((viewresult)view).model, 2); }

the problem line: mockusers.setup(m => m.count()).returns(2);. when running test following error:

system.notsupportedexception : expression references method not belong mocked object: m => m.count<user>()

i think due .count() being static method cannot mocked moq. there way test simple action using moq , not using full-fledged repository pattern, understand should anyway have .count() part hardcoded method testable... maybe use mocks in wrong way? because have impression should quite simple , possible ef code first.

if mocking test entities don't need mock further down chain

something should (although, 'm not @ ide may need tweaking)

update include new inmemorydbset

[test] public void modelvalueshouldbetwo() {     //build test users     var mockusers = new inmemorydbset<user>(){ new user(), new user()};     var mockdb = new mock<itestentities>();     //set mock entities returntest users.     mockdb.setup(db => db.users).returns(mockusers);      var controller = new homecontroller((itestentities)mockdb);      var view = controller.index();      assert.isinstanceof<viewresult>(view);     assert.areequal(((viewresult)view).model, 2); }

this mean extension methods work off of test data have supplied.

see below article on mocking dbset http://geekswithblogs.net/aligned/archive/2012/12/12/mocking-or-faking-dbset.aspx


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