public void DeletesAllContacts()
        {
            //given some existing contact
            var contact1 = new Contact("Joao das Neves");
            var contact2 = new Contact("Jonny of the Snows");

            subject.SaveContact(contact1);
            subject.SaveContact(contact2);

            // When I delete all contacts
            subject.DeleteAll();

            // Then we're left with an empty table of contacts
            var table = DB.Table <Contact>().ToList();

            Assert.Empty(table);
        }