final List<MavenProject> listOfProjects = Collections.singletonList(mavenProject);

        final Set<MavenProject> optionalProjectsBySelectors =
                sut.getOptionalProjectsBySelectors(mavenExecutionRequest, listOfProjects, selectors);

        assertEquals(1, optionalProjectsBySelectors.size());
        assertEquals(List.of(mavenProject), List.copyOf(optionalProjectsBySelectors));
    }

    }

    /**
     * @deprecated use {@link #getActiveProjects(MavenExecutionRequest, List, List)}
     */
    @Deprecated(since = "4.0.0")
    public Set<MavenProject> getOptionalProjectsBySelectors(
            MavenExecutionRequest request, List<MavenProject> projects, Set<String> projectSelectors) {
        Set<MavenProject> resolvedOptionalProjects = new LinkedHashSet<>();

            excludedProjects.addAll(
                    projectSelector.getRequiredProjectsBySelectors(request, allProjects, requiredSelectors));
            excludedProjects.addAll(
                    projectSelector.getOptionalProjectsBySelectors(request, allProjects, optionalSelectors));

            result = new ArrayList<>(projects);
            result.removeAll(excludedProjects);

            if (result.isEmpty()) {

        // We intentionally ignore the results of this method.
        // As a side effect it will log the optional projects that could not be resolved.
        projectSelector.getOptionalProjectsBySelectors(request, session.getAllProjects(), allOptionalSelectors);
    }

    /**
     * Check whether any of the requested optional profiles were not activated or deactivated.
     * @param session the Maven session.