public void ShouldGetCustomers()
        {
            //given

            customersContext.AddExampleCustomers();
            //when
            IEnumerable <Customer> cust     = repo.GetCustomers();
            List <Customer>        custList = new List <Customer>(cust);

            //then
            Assert.AreEqual(customersContext.Customers.Local.Count, custList.Count);
        }