MavenProject project = mock(MavenProject.class);
        when(project.getGroupId()).thenReturn("org.apache.maven.plugins.overflow");
        when(project.getArtifactId()).thenReturn("maven-project-info-reports-plugin");
        when(project.getPackaging()).thenReturn("maven-plugin");
        when(project.getName()).thenReturn("Apache Maven Project Info Reports Plugin");

  session --> build_tree
  
  build1["root build"]
  build_tree --> build1
  
  project1["root project"]
  build1 --> project1
  
  project2["project"]
  build1 --> project2
  
  build2["included build"]
  build_tree --> build2
  
  project3["root project"]
  build2 --> project3
  
  project4["project"]
  build2 --> project4

```

### Build process state

        System.out.println("Location of project-4's POM: " + pom4.getPath());

        // load everything...
        MavenProject project0 = getProject(pom0);
        MavenProject project1 = getProject(pom1);
        MavenProject project2 = getProject(pom2);
        MavenProject project3 = getProject(pom3);
        MavenProject project4 = getProject(pom4);
        MavenProject project5 = getProject(pom5);

    // Before the fix, this would return dProject and eProject twice, once from bProject and once from cProject. As
    // aProject is whitelisted, it should not be returned as a downstream project for itself. bProject and cProject
    // are not whitelisted, so they should return their downstream projects, both have dProject and eProject as

        Map<MavenProject, List<MavenProject>> projects = new HashMap<>();
        projects.put(p1, Collections.emptyList());
        projects.put(p2, Collections.singletonList(p1));

        BuildPlan plan = calculateLifecycleMappings(projects, "verify");
        plan.then(calculateLifecycleMappings(projects, "install"));

        Stream.of(p1, p2).forEach(project -> {

import org.apache.maven.project.CycleDetectedException;
import org.apache.maven.project.DuplicateProjectException;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.ProjectBuildingException;
import org.apache.maven.project.collector.MultiModuleCollectionStrategy;
import org.apache.maven.project.collector.PomlessCollectionStrategy;
import org.apache.maven.project.collector.RequestPomCollectionStrategy;

                plan.steps(project).forEach(step -> {
                    if (step.predecessors.stream().noneMatch(s -> s.project == project)) {
                        step.executeAfter(setup);
                    } else if (step.successors.stream().noneMatch(s -> s.project == project)) {
                        teardown.executeAfter(step);
                    }
                });

        initRepoSession(request, configuration);

        List<MavenProject> projects = new ArrayList<>();

        if (pom != null) {
            MavenProject project = projectBuilder.build(pom, configuration).getProject();

            projects.add(project);
            if (includeModules) {
                for (String module : project.getModules()) {
                    File modulePom = new File(pom.getParentFile(), module);

            if (projects != null) {
                Map<String, Map<String, Map<String, MavenProject>>> map = new HashMap<>();
                projects.forEach(project -> map.computeIfAbsent(project.getGroupId(), k -> new HashMap<>())
                        .computeIfAbsent(project.getArtifactId(), k -> new HashMap<>())
                        .put(project.getVersion(), project));
                this.projects = map;
            } else {

    }

    @Override
    public List<Project> getProjects(List<MavenProject> projects) {
        return projects == null ? null : map(projects, this::getProject);
    }

    @Override
    public Project getProject(MavenProject project) {
        return project != null && project.getBasedir() != null
                ? allProjects.computeIfAbsent(project.getId(), id -> new DefaultProject(this, project))
                : null;
    }