public void IsValid_InvalidCoordinate_ReturnsFalse()
        {
            var customer = new CustomerContract {
                Name = "Bob", UserId = 1, Latitude = 91, Longitude = 6
            };

            Assert.IsFalse(customer.IsValid());
        }
        public void IsValid_NullName_ReturnsFalse()
        {
            var customer = new CustomerContract {
                Name = null, UserId = 1, Latitude = 58, Longitude = 6
            };

            Assert.IsFalse(customer.IsValid());
        }
        public void IsValid_EmptyName_ReturnsFalse()
        {
            var customer = new CustomerContract {
                Name = string.Empty, UserId = 1, Latitude = 58, Longitude = 6
            };

            Assert.IsFalse(customer.IsValid());
        }
        public void IsValid_ValidCustomer_ReturnsTrue()
        {
            var customer = new CustomerContract {
                Name = "Bob", UserId = 1, Latitude = 58, Longitude = 6
            };

            Assert.IsTrue(customer.IsValid());
        }