versionRangeRequest.setTrace(trace);

            final VersionRangeResult versionRangeResult =
                    versionRangeResolver.resolveVersionRange(session, versionRangeRequest);

            if (versionRangeResult.getHighestVersion() == null) {
                throw new UnresolvableModelException(
                        String.format(

            versionRangeRequest.setTrace(trace);

            final VersionRangeResult versionRangeResult = resolver.resolveVersionRange(session, versionRangeRequest);

            if (versionRangeResult.getHighestVersion() == null) {
                throw new UnresolvableModelException(
                        String.format(

import static org.junit.jupiter.api.Assertions.assertTrue;

class RepositorySystemTest extends AbstractRepositoryTestCase {
    @Test
    void testResolveVersionRange() throws Exception {
        // VersionRangeResult resolveVersionRange( RepositorySystemSession session, VersionRangeRequest request )
        //                throws VersionRangeResolutionException;

    }

    @Test
    void testResolveVersion() throws Exception {

        this.versionScheme = Objects.requireNonNull(versionScheme, "versionScheme cannot be null");
    }

    @Override
    public VersionRangeResult resolveVersionRange(RepositorySystemSession session, VersionRangeRequest request)
            throws VersionRangeResolutionException {
        VersionRangeResult result = new VersionRangeResult(request);

     * @see org.apache.maven.api.services.VersionRangeResolver#resolve(Session, ArtifactCoordinates) (String)
     */
    @Nonnull
    List<Version> resolveVersionRange(@Nonnull ArtifactCoordinates artifact) throws VersionResolverException;

    /**
     * Expands a version range to a list of matching versions, in ascending order.