public void Test_Clear_Identities() { Customer customer1 = new Customer(null) { Number = "001" }; Customer customer2 = new Customer(null) { Number = "002" }; Customer customer3 = new Customer(null) { Number = "003" }; Customer customer4 = new Customer(null) { Number = "004", Name = "John Doe" }; Customer customer5 = new Customer(null) { Number = "005" }; IIdentityMap <Customer> map = new IdentityMap <Customer>(); map.AddEntity(customer1); map.AddEntity(customer2); map.AddEntity(customer3); map.AddEntity(customer4); map.AddEntity(customer5); Assert.AreEqual(5, map.Count); map.ClearEntities(); Assert.AreEqual(0, map.Count); }