if (!requiredSelectors.isEmpty() || !optionalSelectors.isEmpty()) {
            Set<MavenProject> selectedProjects =
                    projectSelector.getActiveProjects(request, allSortedProjects, projectActivation.getActivations());

            // it can be empty when an optional project is missing from the reactor, fallback to returning all projects
            if (!selectedProjects.isEmpty()) {

public class DefaultProfileSelectorTest {
    private Profile newProfile(String id) {
        Activation activation = new Activation();
        Profile profile = new Profile();
        profile.setId(id);
        profile.setActivation(activation);
        return profile;
    }

    @Test
    void testThrowingActivator() {
        DefaultProfileSelector selector = new DefaultProfileSelector();

    /**
     * List of activated and deactivated projects.
     */
    private final List<ProjectActivationSettings> activations = new ArrayList<>();

    public List<ProjectActivationSettings> getActivations() {
        return Collections.unmodifiableList(activations);
    }

    /**
     * Adds a project activation to the request.
     * @param selector The selector of the project.