checkVersionsOrder(b, a); // classical
        checkVersionsOrder(b, c); // now b < c, but before MNG-5568, we had b > c
        checkVersionsOrder(a, c);
    }

    /**
     * Test <a href="https://jira.apache.org/jira/browse/MNG-6572">MNG-6572</a> optimization.
     */
    @Test
    void testMng6572() {
        String a = "20190126.230843"; // resembles a SNAPSHOT

    private static final Collection<String> TRANSLATED_PATH_EXPRESSIONS;

    static {
        Collection<String> translatedPrefixes = new HashSet<>();

        // MNG-1927, MNG-2124, MNG-3355:
        // If the build section is present and the project directory is non-null, we should make
        // sure interpolation of the directories below uses translated paths.

    private static final List<String> TRANSLATED_PATH_EXPRESSIONS;

    static {
        List<String> translatedPrefixes = new ArrayList<>();

        // MNG-1927, MNG-2124, MNG-3355:
        // If the build section is present and the project directory is non-null, we should make
        // sure interpolation of the directories below uses translated paths.

            projectsMap.put(projectKey, p);
        }

        for (MavenProject project : projects) {
            // MNG-1911 / MNG-5572: Building plugins with extensions cannot be part of reactor
            for (Plugin plugin : project.getBuildPlugins()) {
                if (plugin.isExtensions()) {
                    String pluginKey =

                    && versionRangeResult.getVersionConstraint().getRange().getUpperBound() == null) {
                // Message below is checked for in the MNG-2199 core IT.
                throw new UnresolvableModelException(
                        String.format(
                                "The requested parent version range '%s' does not specify an upper bound",

                            project.setArtifactId(relocation.getArtifactId());
                        }
                        if (relocation.getVersion() != null) {
                            // note: see MNG-3454. This causes a problem, but fixing it may break more.
                            artifact.setVersionRange(VersionRange.createFromVersion(relocation.getVersion()));
                            relocatedArtifact = artifact;

                            for (int j = 0; j < 2; j++) {
                                Artifact resetArtifact = resetNodes[j].getArtifact();

                                // MNG-2123: if the previous node was not a range, then it wouldn't have any available
                                // versions. We just clobbered the selected version above. (why? I have no idea.)

        VersionRange versionRange;
        try {
            versionRange = VersionRange.createFromVersionSpec(d.getVersion());
        } catch (InvalidVersionSpecificationException e) {
            // MNG-5368: Log a message instead of returning 'null' silently.
            this.logger.error(
                    String.format(

        cli.properties(maybeColorRequest);
        assertThrows(
                IllegalArgumentException.class, () -> cli.logging(maybeColorRequest), "maybe is not a valid option");
    }

    /**
     * Verifies MNG-6558
     */
    @Test
    void testToolchainsBuildingEvents() throws Exception {
        final EventSpyDispatcher eventSpyDispatcherMock = mock(EventSpyDispatcher.class);

            /*
             * This logic (using filesystem, against wanted independence from the user environment) exists only for the
             * sake of backward-compat with 2.x (MNG-5000). In general, it is wrong to
             * base URL inheritance on the module directory names as this information is unavailable for POMs in the