}

    public ArtifactVersion getSelectedVersion(Artifact artifact) throws OverConstrainedVersionException {
        ArtifactVersion version;
        if (recommendedVersion != null) {
            version = recommendedVersion;
        } else {
            if (restrictions.size() == 0) {
                throw new OverConstrainedVersionException("The artifact has no valid ranges", artifact);
            }

        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");