public void GetRulesForDerivedDescriptor()
{
IRuleSet <IValidationRule> ruleSet = this.testee.GetRules(new DerivedTestRuleSetDescriptor());
Assert.IsNotNull(ruleSet);
Assert.AreEqual(2, ruleSet.Count);
Assert.IsInstanceOf(typeof(TestValidationRule), ruleSet.ElementAt(0));
Assert.IsInstanceOf(typeof(AnotherTestValidationRule), ruleSet.ElementAt(1));
}