public void RuleFreeShippingIfOverOneHundredDollars_CustomerHas75DollarsTotal_NotValid() { //Arrange var order = new Order { CustomerId = 2, OrderDateTime = DateTime.Today, FreeShipping = true }; //Act var res = _orderValidation.RuleCustomersGetFreeShippingIfOverOneHundredDollarsAMonth().Validate(order); //Assert Assert.IsFalse(res.IsValid); }