public void when_adding_annotation_then_can_retrieve_it()
{
var annotated = new AnnotatedObject();
annotated.AddAnnotation(new FooAnnotation());
Assert.NotNull(annotated.Annotation<FooAnnotation>());
}
public void when_adding_two_annotations_then_can_retrieve_one()
{
var annotated = new AnnotatedObject();
var annotation = new FooAnnotation();
annotated.AddAnnotation(annotation);
annotated.AddAnnotation(new BarAnnotation());
Assert.Same(annotation, annotated.Annotation<FooAnnotation>());
}