Somthing wrong with this Unit Test EF

m new in Unit test and EF Code first Im trying to test function to add data into database by using EF. I dont know whats wrong with my code, it should fail but it Passes Here is m Test function

[TestClass]
public class ProspectControllerTest
{
    [TestMethod]
    public void Index()
    {     
     DataContext context = new DataContext();
           Seller c = new Seller
           {
               SellerName = "test20",
               SellerDivision = "test20",
               SellerCity  = "City410",
               Active = true,

           };
        context.sellers.Add(c);

           context.SaveChanges();


           Seller s = (from d in context.sellers
                       where d.SellerId == c.SellerId
                       select d).Single();
           //This shouldent pass because there is no records in the db !
           c.SellerName.Equals(s.SellerName);

       }
    }
}

Here is m class

  public class Seller
{
    [Key]
    public int SellerId { get; set; }
    public string SellerName { get; set; }
    public string SellerDiv { get; set; }
    public string SellerCity { get; set; }

    public Boolean Active { get; set; }

    public Div Div { get; set; }
    public ICollection<Prospect> prospects { get; set; }
}

Another quastion, Does this test store any data into db ?should i be able to se the records in the database ?