addSnapshotVersion(source.getVersioning(), before, artifact);
        // nothing should be updated, as the target was already updated at a later date than source
        assertFalse(target.merge(source));
        assertEquals(1, target.getVersioning().getSnapshotVersions().size());
        assertEquals(sv1, target.getVersioning().getSnapshotVersions().get(0));

            versioning.setLastUpdatedTimestamp(timestamp);
            lastUpdated = versioning.getLastUpdated();

            metadata.setVersioning(versioning);
        } else {
            snapshot = metadata.getVersioning().getSnapshot();
            lastUpdated = metadata.getVersioning().getLastUpdated();
        }

        for (Artifact artifact : artifacts) {
            String version = artifact.getVersion();

                    if (m.getVersioning() == null) {
                        m.setVersioning(new Versioning());
                    }

                    if (m.getVersioning().getSnapshot() == null) {
                        m.getVersioning().setSnapshot(new Snapshot());
                    }
                } else {
                    if ((m.getVersioning() != null)

            }
            if (versioning.getRelease() == null) {
                versioning.setRelease(recessive.getVersioning().getRelease());
            }

            Collection<String> versions =
                    new LinkedHashSet<>(recessive.getVersioning().getVersions());
            versions.addAll(versioning.getVersions());
            versioning.setVersions(new ArrayList<>(versions));

    }

    @Override
    protected void merge(Metadata recessive) {
        metadata.getVersioning().setLastUpdatedTimestamp(timestamp);

        String lastUpdated = metadata.getVersioning().getLastUpdated();

        Map<String, SnapshotVersion> versions = new LinkedHashMap<>();

        for (Artifact artifact : artifacts) {

        Metadata repoMetadata = metadata.getMetadata();
        if ((repoMetadata != null)
                && (repoMetadata.getVersioning() != null
                        && repoMetadata.getVersioning().getSnapshot() != null)) {
            buildNumber = repoMetadata.getVersioning().getSnapshot().getBuildNumber();
        }
        return buildNumber;
    }

    public static DateFormat getUtcDateFormatter() {

            metadata.setPlugins(new ArrayList<>(mergedPlugins.values()));
        }

        // just carry-on as-is
        if (recessive.getVersioning() != null) {
            metadata.setVersioning(recessive.getVersioning());
        }
    }

    @Deprecated
    @Override
    public MavenMetadata setFile(File file) {
        return new PluginsMetadata(pluginInfo, file.toPath(), timestamp);

        metadata.merge(new Metadata());

        String dateAfter = gregorianDate();

        String ts = metadata.metadata.getVersioning().getSnapshot().getTimestamp();
        String datePart = DATE_FILTER.matcher(ts).replaceAll("");

        /* Allow for this test running across midnight */

        artifact.addMetadata(metadata);

        Metadata repoMetadata = metadata.getMetadata();
        String version = null;
        if (repoMetadata != null && repoMetadata.getVersioning() != null) {
            version = constructVersion(repoMetadata.getVersioning(), artifact.getBaseVersion());
        }

        if (version == null) {
            // use the local copy, or if it doesn't exist - go to the remote repo for it

            Metadata repoMetadata, List<String> availableVersions) {
        Collection<String> versions = new LinkedHashSet<>();

        if ((repoMetadata != null) && (repoMetadata.getVersioning() != null)) {
            versions.addAll(repoMetadata.getVersioning().getVersions());
        }

        versions.addAll(availableVersions);

        List<ArtifactVersion> artifactVersions = new ArrayList<>(versions.size());