modules = true;
                } else {
                    unknown = true;
                }
                if (selected == null) {
                    selected = type;
                } else if (unknown) {
                    // More than one filtered value, and we don't know how to handle at least one of them.

                scenario("Project selected with different selector resolves to same project")
                        .activeRequiredProjects(GROUP_ID + ":" + MODULE_A)
                        .inactiveRequiredProjects(MODULE_A)
                        .expectResult(MavenExecutionException.class, "empty reactor"),
                scenario("Selected and excluded same project, but also selected another project")

    private static final String CHECK_VERSION_RECOMMENDATION = "check version recommended";

    private static final String CHECK_SELECTED_VERSION_KNOWN = "check selected version known";

    private static final String CHECK_SELECTED_VERSION = "check selected version";

    @Test
    void testRange() throws InvalidVersionSpecificationException, OverConstrainedVersionException {
        Artifact artifact = null;

     * @param type
     * @param requirements
     * @return the selected {@link Toolchain}s
     * @throws ToolchainManagerException if an exception occurs
     */
    @Nonnull
    List<Toolchain> getToolchains(@Nonnull Session session, String type, Map<String, String> requirements);

    /**
     *
     * @param session
     * @param type
     * @return the selected {@link Toolchain}

                    modules = true;
                } else {
                    unknown = true;
                }
                if (selected == null) {
                    selected = type;
                } else if (unknown) {
                    // More than one filtered value, and we don't know how to handle at least one of them.

        MetadataGraphEdge res;

        res = policy.apply(e1, e2);
        assertEquals("1.1", res.getVersion(), "Wrong depth edge selected");

        res = policy.apply(e1, e3);
        assertEquals("1.2", res.getVersion(), "Wrong version edge selected");
    }
    // ------------------------------------------------------------------------------------------

public class DefaultGraphConflictResolutionPolicy implements GraphConflictResolutionPolicy {
    /**
     * artifact, closer to the entry point, is selected
     */
    @Configuration(name = "closer-first", value = "true")
    private boolean closerFirst = true;

    /**
     * newer artifact is selected
     */
    @Configuration(name = "newer-first", value = "true")
    private boolean newerFirst = true;

        for (String selector : projectSelectors) {
            Optional<MavenProject> optSelectedProject =
                    findOptionalProjectBySelector(projects, baseDirectory, selector);
            if (!optSelectedProject.isPresent()) {
                String message = "Could not find the selected project in the reactor: " + selector;

                    // set the recommended version
                    ArtifactVersion selected = artifact.getSelectedVersion();
                    // MNG-2123: null is a valid response to getSelectedVersion, don't
                    // assume it won't ever be.
                    if (selected != null) {
                        artifact.selectVersion(selected.toString());
                    } else {

            mappings.put(phase, phaseBindings);

            if (phase.equals(lifecyclePhase)) {
                break;
            }
        }

        /*
         * Grab plugin executions that are bound to the selected lifecycle phases from project. The effective model of
         * the project already contains the plugin executions induced by the project's packaging type. Remember, all