public void WhenInvalid()
        {
            Inventor context = new Inventor("Nikola Tesla", new DateTime(1856, 7, 9), "Serbian");
            IValidationErrors errors = new ValidationErrors();

            ErrorMessageAction action = new ErrorMessageAction("{0}, {1}", "errors");
            action.Parameters = new IExpression[] {Expression.Parse("Name"), Expression.Parse("Nationality")};
            
            action.Execute(false, context, null, errors);
            Assert.IsFalse(errors.IsEmpty);
            Assert.AreEqual(1, errors.GetErrors("errors").Count);
            Assert.AreEqual(context.Name + ", " + context.Nationality, errors.GetResolvedErrors("errors", new NullMessageSource())[0]);
        }
        public void WhenActionIsNotExecutedBecauseWhenExpressionReturnsFalse()
        {
            Inventor context = new Inventor("Nikola Tesla", new DateTime(1856, 7, 9), "Serbian");
            IValidationErrors errors = new ValidationErrors();

            ErrorMessageAction action = new ErrorMessageAction("{0}, {1}", "errors");
            action.When = Expression.Parse("false");
            action.Execute(false, context, null, errors);
            Assert.IsTrue(errors.IsEmpty);
        }
 public void WhenValid()
 {
     Inventor context = new Inventor("Nikola Tesla", new DateTime(1856, 7, 9), "Serbian");
     IValidationErrors errors = new ValidationErrors();
     ErrorMessageAction action = new ErrorMessageAction("error", "errors");
     
     action.Execute(true, context, null, errors);
     Assert.IsTrue(errors.IsEmpty);
 }