c# - Mocking UserManager -

i used post (http://www.asp.net/web-api/overview/testing-and-debugging/mocking-entity-framework-when-unit-testing-aspnet-web-api-2) mocking db , able test. of classes has applicationuser foreign key. having trouble test them. can do?

this interface:

using system; using system.data.entity;  namespace prac.models {    public interface ipraccontext : idisposable    {        idbset<graduando> graduando { get; set; }        idbset<funcionario> funcionario { get; set; }        idbset<applicationuser> users { get; set; }         int savechanges();        void markasmodified<t>(t i) t : class;     } } 

identitymodels.cs (with applicatiouser class)

using system.data.entity; using system.security.claims; using system.threading.tasks; using microsoft.aspnet.identity; using microsoft.aspnet.identity.entityframework;  namespace prac.models {     // can add profile data user adding more properties applicationuser class, please visit http://go.microsoft.com/fwlink/?linkid=317594 learn more.     public class applicationuser : identityuser     {         public async task<claimsidentity> generateuseridentityasync(usermanager<applicationuser> manager, string authenticationtype)         {             // note authenticationtype must match 1 defined in cookieauthenticationoptions.authenticationtype             var useridentity = await manager.createidentityasync(this, authenticationtype);             // add custom user claims here             return useridentity;         }     }      public class applicationdbcontext : identitydbcontext<applicationuser>, ipraccontext     {         public applicationdbcontext()             : base("defaultconnection", throwifv1schema: false)         {             //solve problem of json serialization             //db getting data foreign key             base.configuration.proxycreationenabled = false;         }          public static applicationdbcontext create()         {             return new applicationdbcontext();         }          public void markasmodified<t>(t i) t : class         {             entry(i).state = entitystate.modified;         }          public idbset<beneficio> beneficio { get; set; }          public idbset<familiar> familiar { get; set; }          public idbset<cadastrograduando> cadastrograduando { get; set; }          public idbset<graduando> graduando { get; set; }          public idbset<doencacronica> doencacronica { get; set; }          public idbset<edital> edital { get; set; }          public idbset<editalgraduando> editalgraduandoe { get; set; }          public idbset<funcionario> funcionario { get; set; }          public idbset<noticia> noticia { get; set; }     } }