new PluginParameterExpressionEvaluatorV4(session, null, exec).evaluate("${mojo.plugin.descriptor}");

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

        assertSame(
                exec.getPlugin().getDescriptor(),
                result,
                "${mojo.plugin.descriptor} expression does not return plugin descriptor.");
    }

    @Test

        MojoDescriptor mojoDescriptor = execution.getMojoDescriptor();

        if (mojoDescriptor == null) {
            mojoDescriptor = pluginManager.getMojoDescriptor(
                    execution.getPlugin(),
                    execution.getGoal(),
                    project.getRemotePluginRepositories(),
                    session.getRepositorySession());

            execution.setMojoDescriptor(mojoDescriptor);

        InputSource defaultBindings = new InputSource();
        defaultBindings.setModelId(DefaultLifecycleRegistry.DEFAULT_LIFECYCLE_MODELID);

        final Plugin plugin = mojoDescriptor.getPluginDescriptor().getPlugin();
        plugin.setLocation("version", new InputLocation(12, 34, defaultBindings));
        MojoExecution result = new MojoExecution(plugin, goal, executionId);

        return false;
    }

    private String pluginDeclaration(MavenSession mavenSession, MojoDescriptor mojoDescriptor) {
        InputLocation inputLocation =
                mojoDescriptor.getPluginDescriptor().getPlugin().getLocation("");
        if (inputLocation != null && inputLocation.getSource() != null) {
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append(inputLocation.getSource().getModelId());

                    .collect(Collectors.joining("\n\t"));
            PluginIncompatibleException pie = new PluginIncompatibleException(
                    pluginDescriptor.getPlugin(),
                    "\nThe plugin " + pluginDescriptor.getId() + " has unmet prerequisites: \n\t" + messages);
            prerequisiteExceptions.forEach(pie::addSuppressed);
            throw pie;
        }
    }

        final String defaulModelId = DefaultLifecycleRegistry.DEFAULT_LIFECYCLE_MODELID;

        List<String> unversionedPlugins = executionPlan.getMojoExecutions().stream()
                .map(MojoExecution::getPlugin)
                .filter(p -> p.getLocation("version") != null
                        && p.getLocation("version").getSource() != null
                        && defaulModelId.equals(

    }

    public String getRequiredJavaVersion() {
        return requiredJavaVersion;
    }

    public void setPlugin(Plugin plugin) {
        this.plugin = plugin;
    }

    public Plugin getPlugin() {
        return plugin;
    }

    public Artifact getPluginArtifact() {
        return pluginArtifact;
    }

        // one by one, and try to find a matching prefix.
        if (result == null && build != null) {
            result = resolveFromProject(request, build.getPlugins());
            if (result == null && management != null) {
                result = resolveFromProject(request, management.getPlugins());
            }
        }

        if (result == null) {
            throw new NoPluginFoundForPrefixException(

                PluginContainer target, PluginContainer source, boolean sourceDominant, Map<Object, Object> context) {
            List<Plugin> src = source.getPlugins();
            if (!src.isEmpty()) {
                List<Plugin> tgt = target.getPlugins();
                Map<Object, Plugin> master = new LinkedHashMap<>(src.size() * 2);

                for (Plugin element : src) {

            Build build = request.getPom().getBuild();

            result = resolveFromProject(request, build.getPlugins());

            if (result == null && build.getPluginManagement() != null) {
                result = resolveFromProject(request, build.getPluginManagement().getPlugins());
            }
        }

        return result;
    }