p1.update(p2);

        assertEquals(2, (Object) p1.size());
        Object o23 = p1.getComments("trees");
        assertEquals(List.of("#", "# List of trees", "#"), o23);
        Object o22 = p1.getProperty("trees");
        assertEquals("fir, oak, maple", o22);
        Object o21 = p1.getComments("fruits");
        assertEquals(List.of("#", "# List of good fruits", "#"), o21);

            properties.put("license." + i + ".name", license.getName());
            properties.put("license." + i + ".url", license.getUrl());
            properties.put("license." + i + ".comments", license.getComments());
            properties.put("license." + i + ".distribution", license.getDistribution());
        }

        result.setProperties(properties);

        setArtifactProperties(result, model);
    }

            List<String> comments = properties.getComments(key);
            List<String> value = properties.getRaw(key);
            if (v == null) {
                this.put(key, comments, value);
                modified = true;
            } else if (!v.equals(properties.get(key))) {
                if (comments.isEmpty()) {
                    comments = this.getComments(key);
                }