deferDeleteFile(consumer);

            project.addAttachedArtifact(createConsumerPomArtifact(project, consumer, session));
        } else if (project.getModel().getDelegate().isRoot()) {
            throw new IllegalStateException(
                    "The use of the root attribute on the model requires the buildconsumer feature to be active");
        }
    }

        MavenProject p2 = results.get(1).getProject();
        MavenProject parent = p1.getArtifactId().equals("parent") ? p1 : p2;
        assertEquals(List.of("child"), parent.getModel().getDelegate().getSubprojects());
    }

    @Test
    public void testEmptySubprojectsElementPreventsDiscovery() throws Exception {
        File pom = getTestFile("src/test/resources/projects/subprojects-empty/pom.xml");

                plugin.setArtifactId(extension.getArtifactId());
                plugin.setVersion(extension.getVersion());
                XmlNode configuration = extension.getDelegate().getConfiguration();
                if (configuration != null) {
                    plugin.setConfiguration(new Xpp3Dom(configuration));
                }
                extensionPlugins.add(plugin);
            }

            try (OutputStream output = Files.newOutputStream(metadataFile.toPath())) {
                MetadataStaxWriter mappingWriter = new MetadataStaxWriter();
                mappingWriter.write(output, metadata.getDelegate());
            }
        } else {
            metadataFile.setLastModified(System.currentTimeMillis());
        }
    }

    @Override
    public String toString() {

            throws PluginResolutionException {
        InternalSession iSession = InternalSession.from(session);
        RequestTraceHelper.ResolverTrace trace = RequestTraceHelper.enter(iSession, plugin.getDelegate());

        if (pluginArtifact == null) {
            pluginArtifact = toArtifact(plugin, session);
        }

        DependencyFilter collectionFilter = new ScopeDependencyFilter("provided", "test");

         */

        Map<String, Map<PhaseId, List<MojoExecution>>> mappings =
                new TreeMap<>(new PhaseComparator(lifecycle.getPhases()));

        Map<String, String> aliases = lifecycle.getDelegate().aliases().stream()
                .collect(Collectors.toMap(a -> a.v3Phase(), a -> a.v4Phase()));

        if (aliases.containsKey(lifecyclePhase)) {

                        request.getLocalRepository().pathOf(pomArtifact));

                try {
                    Model model = modelReader.read(pomFile, null).getDelegate();

                    dependencies = Dependency.dependencyToApiV3(model.getDependencies());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            orderedMap.forEach(props::setProperty);

            // Get the immutable delegate (v4 API model is already immutable)
            org.apache.maven.api.model.Model immutable = model.getDelegate();

            // Verify order is preserved
            Map<String, String> resultProps = immutable.getProperties();
            assertNotNull(resultProps);

        }

        List<RemoteRepository> newRepositories =
                Collections.singletonList(ArtifactDescriptorUtils.toRemoteRepository(repository.getDelegate()));

        if (ProjectBuildingRequest.RepositoryMerging.REQUEST_DOMINANT.equals(repositoryMerging)) {
            repositories = remoteRepositoryManager.aggregateRepositories(session, repositories, newRepositories, true);

            } else if (data instanceof Plugin pluginData) {
                plugin = pluginData;
            } else if (data instanceof org.apache.maven.model.Plugin pluginData) {
                plugin = pluginData.getDelegate();
            }
            trace = trace.getParent();
        }

        Path trackingDir;
        boolean missing = event.getFile() == null;
        if (missing) {