public void IndexRecognizesChangeInAChildProperty()
{
var someObservableObject = new ObservableObject {
SomeMutable = 6
};
var someCollection = new ObservableCollection <ObservableObject>(
new List <ObservableObject> {
someObservableObject
});
var indexSpec = IndexSpecification <ObservableObject> .Build()
.With(child => child.SomeMutable);
var someIndex = IndexBuilder.BuildIndicesFor(someCollection, indexSpec);
someObservableObject.SomeMutable = 3;
Assert.AreEqual((from v in someIndex where v.SomeMutable == 3 select v).Count(), 1);
}