public void NegateSpecificationTestNegateSpecification()
{
// arrange
var specFirstName = new AdHocSpecification <Sample>(x => x.FirstName.StartsWith("J"));
var spec = new NegateSpecification <Sample>(specFirstName);
// act
var resultFirstName = TestData.List.Where(specFirstName.IsSatisfied()).OrderBy(c => c.FirstName);
var result = TestData.List.Where(spec.IsSatisfied()).OrderBy(c => c.FirstName);
// assert
Assert.That(resultFirstName.Count(), Is.EqualTo(2));
Assert.That(resultFirstName.First().FirstName, Is.EqualTo("Jose"));
Assert.That(resultFirstName.Last().FirstName, Is.EqualTo("Julian"));
Assert.That(result.Count(), Is.EqualTo(1));
Assert.That(result.First().FirstName, Is.EqualTo("Manuel"));
Assert.That(result.First().LastName, Is.EqualTo("Rivera"));
}