@Inject
    private MavenRepositorySystem factory;

    private Path rootDirectory;

    @Test
    void testPluginDescriptorExpressionReference() throws Exception {
        MojoExecution exec = newMojoExecution();

        MavenSession session = newMavenSession();

        Object result = new PluginParameterExpressionEvaluator(session, exec).evaluate("${plugin}");

        System.out.println("Result: " + result);

        MojoExecution mojoExecution = newMojoExecution(session);

        return new PluginParameterExpressionEvaluatorV4(
                session, project != null ? new DefaultProject(session, project) : null, mojoExecution);
    }

    private MojoExecution newMojoExecution(Session session) {
        PluginDescriptor pd = new PluginDescriptor();