assertEquals(createSet(artifacts), res.getArtifacts(), "Check artifact list");
        assertEquals("1.0", getArtifact("d", res.getArtifacts()).getVersion(), "Check version");
        assertEquals("2.0", getArtifact("b", res.getArtifacts()).getVersion(), "Check version");
    }

    @Test
    void testResolveNearestNewestIsNearest() throws ArtifactResolutionException, InvalidVersionSpecificationException {

            if (bound == null) {
                return null;
            }
            return new Boundary() {
                @Override
                public Version getVersion() {
                    return new DefaultVersion(versionScheme, bound.getVersion());
                }

                @Override
                public boolean isInclusive() {
                    return bound.isInclusive();
                }

    }

    @Override
    public String getClassifier() {
        return dependency.getArtifact().getClassifier();
    }

    @Override
    public Version getVersion() {
        return session.parseVersion(dependency.getArtifact().getVersion());
    }

    @Override
    public Version getBaseVersion() {
        return session.parseVersion(dependency.getArtifact().getBaseVersion());
    }

    @Override

                .reduce((a, b) -> {
                    throw new IllegalStateException(
                            "Multiple modules with key " + a.getGroupId() + ':' + a.getArtifactId());
                })
                .orElse(null);
    }

    private String getVersion(Model model) {
        String version = model.getVersion();

            return null;
        }

        String version = getVersion(candidateModel);
        if (version != null && parent.getVersion() != null && !version.equals(parent.getVersion())) {
            try {
                VersionRange parentRange = versionParser.parseVersionRange(parent.getVersion());
                if (!parentRange.contains(versionParser.parseVersion(version))) {

        return metadata.getGroupId();
    }

    @Override
    public String getArtifactId() {
        return metadata.getArtifactId();
    }

    @Override
    public String getVersion() {
        return metadata.getVersion();
    }

    @Override
    public Nature getNature() {
        return Nature.SNAPSHOT;
    }

    }

    @Nonnull
    @Override
    public String getArtifactId() {
        return project.getArtifactId();
    }

    @Nonnull
    @Override
    public String getVersion() {
        return project.getVersion();
    }

    @Nonnull
    @Override
    public List<Artifact> getArtifacts() {
        org.eclipse.aether.artifact.Artifact pomArtifact = RepositoryUtils.toArtifact(new ProjectArtifact(project));

                if (equals(existing.getVersion(), dependency.getVersion())) {
                    msg = "duplicate declaration of version " + Objects.toString(dependency.getVersion(), "(?)");
                } else {
                    msg = "version " + Objects.toString(existing.getVersion(), "(?)") + " vs "
                            + Objects.toString(dependency.getVersion(), "(?)");
                }

                for (Extension ext : extensions) {
                    String version;
                    if (ext.getVersion() == null || ext.getVersion().isEmpty()) {
                        version = "RELEASE";
                    } else {
                        version = ext.getVersion();
                    }

                    Artifact artifact = repositorySystem.createArtifact(

    }

    @Nonnull
    @Override
    public String getArtifactId() {
        return artifact.getArtifactId();
    }

    @Nonnull
    @Override
    public Version getVersion() {
        return session.parseVersion(artifact.getVersion());
    }

    @Override
    public Version getBaseVersion() {
        return session.parseVersion(artifact.getBaseVersion());
    }

    @Nonnull
    @Override