public void ComplexComposition_LinqUsage_FoundMatchingElements()
{
IEnumerable <ComplexType> data = new ComplexContainer();
var fooLengthOf2 = new Foo_LengthOf2();
var q1 = from c in data where fooLengthOf2.IsSatisfiedBy(c) select c.Bar;
Assert.That(q1.First(), Is.EqualTo(2));
Func <ComplexType, bool> notEven = c => new Bar_Even().Not().IsSatisfiedBy(c);
var q2 = data.Where(notEven).Select(c => c.Foo);
Assert.That(q2.First(), Is.EqualTo("12"));
Specification <ComplexType> enabled = new ComplexType_Enabled(), barEven = new Bar_Even();
Func <ComplexType, bool> enabledOrDisabledAndBarEven = c => enabled.IsSatisfiedBy(c) || (!enabled.IsSatisfiedBy(c) && barEven.IsSatisfiedBy(c));
var q3 = from c in data where enabledOrDisabledAndBarEven(c) select c;
Assert.That(q3, Must.Have.Count(Is.EqualTo(6)));
}
public void ComplexComposition_PredicateUsage_FoundMatchingElements()
{
var data = new List <ComplexType>(new ComplexContainer());
Assert.That(data.Find(new Foo_LengthOf2().IsSatisfiedBy).Bar, Is.EqualTo(2));
Assert.That(data.FindIndex(new Bar_Even().Not().IsSatisfiedBy), Is.EqualTo(2));
Specification <ComplexType> enabled = new ComplexType_Enabled(), barEven = new Bar_Even();
Predicate <ComplexType> enabledOrDisabledAndBarEven = c => enabled.IsSatisfiedBy(c) || (!enabled.IsSatisfiedBy(c) && barEven.IsSatisfiedBy(c));
Assert.That(data.FindAll(enabledOrDisabledAndBarEven), Has.Count.EqualTo(6));
}