public void Can_add_and_remove_annotation()
{
var annotatable = new Annotatable();
Assert.Null(annotatable.FindAnnotation("Foo"));
Assert.Null(annotatable.RemoveAnnotation("Foo"));
var annotation = annotatable.AddAnnotation("Foo", "Bar");
Assert.NotNull(annotation);
Assert.Equal("Bar", annotation.Value);
Assert.Equal("Bar", annotatable["Foo"]);
Assert.Same(annotation, annotatable.FindAnnotation("Foo"));
Assert.Same(annotation, annotatable.GetOrAddAnnotation("Foo", "Baz"));
Assert.Equal(new[] { annotation }, annotatable.GetAnnotations().ToArray());
Assert.Same(annotation, annotatable.RemoveAnnotation(annotation.Name));
Assert.Empty(annotatable.GetAnnotations());
Assert.Null(annotatable.RemoveAnnotation(annotation.Name));
Assert.Null(annotatable["Foo"]);
Assert.Null(annotatable.FindAnnotation("Foo"));
}
