projectBuilds.add(createProjectBuild(A, session, segment));
        projectBuilds.add(createProjectBuild(B, session, segment));
        projectBuilds.add(createProjectBuild(C, session, segment));
        projectBuilds.add(createProjectBuild(X, session, segment));
        projectBuilds.add(createProjectBuild(Y, session, segment));
        projectBuilds.add(createProjectBuild(Z, session, segment));

        }

        artifacts.add(artifact);
    }

    public Set<Artifact> getArtifacts() {
        return artifacts;
    }

    public void addRequestedArtifact(Artifact artifact) {
        if (requestedArtifacts == null) {
            requestedArtifacts = new LinkedHashSet<>();
        }

        requestedArtifacts.add(artifact);
    }

        Collection<ModelProblem> list = new ArrayList<>();
        for (ModelProblem item : problems) {
            list.add(item);
        }
        for (ModelProblem item : result.getProblems()) {
            list.add(item);
        }
        return new Result<>(result.hasErrors() || hasErrors(problems), result.get(), list);
    }

        assertThat(result, is(true));
    }

    @Test
    void getOptionalProjectsBySelectorsReturnsMatches() {
        final HashSet<String> selectors = new HashSet<>();
        selectors.add(":maven-core");
        selectors.add(":optional");

        final MavenProject mavenProject = createMavenProject("maven-core");
        final List<MavenProject> listOfProjects = Collections.singletonList(mavenProject);

    Vertex addVertex(String label) {
        return vertices.computeIfAbsent(label, Vertex::new);
    }

    void addEdge(Vertex from, Vertex to) throws CycleDetectedException {
        from.children.add(to);
        to.parents.add(from);
        List<String> cycle = findCycle(to);
        if (cycle != null) {
            // remove edge which introduced cycle
            removeEdge(from, to);
            throw new CycleDetectedException(

     *
     * @param type the type of path (class-path, module-path, …)
     * @param path the path element to add
     */
    private void addPathElement(PathType type, Path path) {
        dispatchedPaths.computeIfAbsent(type, (t) -> new ArrayList<>()).add(path);
    }

    /**
     * Adds main and test output directories to the result. This method adds the main output directory

        MavenExecutionRequest request = new DefaultMavenExecutionRequest();
        request.setLocalRepository(getLocalRepository());
        List<Server> servers = new ArrayList<>();
        servers.add(server);
        request.setServers(servers);

        DefaultRepositorySystemSessionFactory systemSessionFactory = new DefaultRepositorySystemSessionFactory(
                aetherRepositorySystem,

                    model.getPluginRepositories(), pluginRepositories, projectBuildingRequest);
        } catch (Exception e) {
            event.problems()
                    .add(
                            BuilderProblem.Severity.ERROR,
                            ModelProblem.Version.BASE,
                            "Invalid plugin repository: " + e.getMessage(),
                            e);

    List<MojoExecution> getExecutions(MavenExecutionPlan mavenExecutionPlan) {
        List<MojoExecution> result = new ArrayList<>();
        for (ExecutionPlanItem executionPlanItem : mavenExecutionPlan) {
            result.add(executionPlanItem.getMojoExecution());
        }
        return result;
    }

    // We need to take in multiple lifecycles

 */
class DefaultClassRealmManagerTest {

    private DefaultClassRealmManager newDefaultClassRealmManager(PlexusContainer container) {
        HashSet<String> exportedPackages = new HashSet<String>();
        exportedPackages.add("group1:artifact1");

        return new DefaultClassRealmManager(
                new DefaultCoreRealm(container),
                new ArrayList<ClassRealmManagerDelegate>(),