static List<String> diff(ToNode actual, ToNode expected) {
        return new NodeDiff().findDifferences(actual.toNode(), expected.toNode(), "")
                .sorted()
                .collect(Collectors.toList());
    }
Creates a line-by-line diff of two Node values.
smithy-model/src/main/java/software/amazon/smithy/model/node/NodeDiff.java