return optional;
    }

    @Override
    public ArtifactVersion getSelectedVersion() throws OverConstrainedVersionException {
        return versionRange.getSelectedVersion(this);
    }

    @Override
    public boolean isSelectedVersionKnown() throws OverConstrainedVersionException {
        return versionRange.isSelectedVersionKnown(this);
    }

    @Override

        b.addDependency("c", "3.3.0-v3346");

        ArtifactSpec c = createArtifactSpec("c", "3.2.1-v3235e");

        OverConstrainedVersionException e = assertThrows(
                OverConstrainedVersionException.class, () -> collect(createSet(new Object[] {a.artifact})));
        assertTrue(e.getMessage().contains("[3.2.1-v3235e, 3.3.0-v3346]"), "Versions unordered");

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

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

        VersionRange range = VersionRange.createFromVersionSpec("(,1.0]");
        List<Restriction> restrictions = range.getRestrictions();