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")); }