assertEquals(-1, problem.getColumnNumber());

        problem = new DefaultProblem(null, null, null, -1, 42, null);
        assertEquals(42, problem.getColumnNumber());

        problem = new DefaultProblem(null, null, null, -1, Integer.MAX_VALUE, null);
        assertEquals(Integer.MAX_VALUE, problem.getColumnNumber());

        // this case is not specified, might also return -1

        Set<Artifact> resolved = new LinkedHashSet<>();

        if (projects == null || projects.isEmpty()) {
            return resolved;
        }

        if ((scopesToCollect == null || scopesToCollect.isEmpty())
                && (scopesToResolve == null || scopesToResolve.isEmpty())) {
            return resolved;
        }

        /*

                return KILOBYTE;
            } else {
                return BYTE;
            }
        }
    }

    public String format(long size) {
        return format(size, null);
    }

    public String format(long size, ScaleUnit unit) {
        return format(size, unit, false);
    }

    public String format(long size, ScaleUnit unit, boolean omitSymbol) {

    // gather artifactIds which are not unique so that the respective thread names can be extended with the groupId
    public Set<String> duplicateIds() {
        if (duplicateIds == null) {
            synchronized (this) {
                if (duplicateIds == null) {
                    duplicateIds = projects()
                            .map(MavenProject::getArtifactId)

    }

    private String emptify(String string) {
        return (string != null) ? string : "";
    }

    @Override
    public File getFile() {
        return null;
    }

    @Override
    public MetadataBridge setFile(File file) {
        return this;
    }

    @Override
    public Path getPath() {
        return null;
    }

    @Override
    public Nature getNature() {

        // and we want artifact resolution to only return the system scoped artifact itself.
        //
        if (artifact.getScope() != null && artifact.getScope().equals(Artifact.SCOPE_SYSTEM)) {
            return new ResolutionGroup(null, null, null);
        }

        ResolutionGroup cached = cache.get(
                artifact,
                request.isResolveManagedVersions(),

    /**
     * The resolved group id for the plugin.
     *
     * @return The resolved group id for the plugin, never {@code null}.
     */
    String getGroupId();

    /**
     * The resolved artifact id for the plugin.
     *
     * @return The resolved artifact id for the plugin, never {@code null}.
     */
    String getArtifactId();

    /**
     * The repository from which the plugin prefix was resolved.
     *

        DefaultLifecycleRegistry lifecycles = new DefaultLifecycleRegistry(Collections.emptyList());
        BuildPlanExecutor builder = new BuildPlanExecutor(null, null, null, null, null, null, null, null, lifecycles);
        BuildPlanExecutor.BuildContext context = builder.new BuildContext();
        return context.calculateLifecycleMappings(projects, phase);
    }

    /*
    @Test

            VersionResult result) {
        Versioning versioning = null;
        try {
            if (metadata != null) {
                try (SyncContext syncContext = syncContextFactory.newInstance(session, true)) {
                    syncContext.acquire(null, Collections.singleton(metadata));

                    if (metadata.getPath() != null && Files.exists(metadata.getPath())) {

        return build(session, artifactCoordinates, null, null);
    }

    /**
     * Creates a version range resolver request.
     *
     * @param session the session to use, must not be {@code null}
     * @param artifactCoordinates the artifact coordinates whose version range should be resolved, must not be {@code null}
     * @param repositories the repositories to use, or {@code null} to use the session's repositories