return xformed != path ? (builder != null ? builder : creator.get()).missing(xformed) : builder;
            }

            @Override
            protected ActivationFile.Builder transformActivationFile_Exists(
                    Supplier<? extends ActivationFile.Builder> creator,
                    ActivationFile.Builder builder,
                    ActivationFile target) {

        @Override
        protected Activation.Builder transformActivation_ActiveByDefault(
                Supplier<? extends Activation.Builder> creator, Activation.Builder builder, Activation target) {
            return builder;
        }

        @Override
        protected Activation.Builder transformActivation_File(
                Supplier<? extends Activation.Builder> creator, Activation.Builder builder, Activation target) {

        }

        //
        // Builder, concurrency and parallelism
        //
        // We preserve the existing methods for builder selection which is to look for various inputs in the threading
        // configuration. We don't have an easy way to allow a pluggable builder to provide its own configuration

                            new DefaultModelBuildingListener(project, projectBuildingHelper, this.request);

                    ModelBuilderRequest.ModelBuilderRequestBuilder builder = getModelBuildingRequest();
                    ModelBuilderRequest request = builder.projectBuild(modelPool != null)
                            .source(modelSource)
                            .projectBuild(true)
                            .locationTracking(true)

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

@PlexusTest
class PomConstructionTest {
    private static String BASE_DIR = "src/test";

    private static String BASE_POM_DIR = BASE_DIR + "/resources-project-builder";

    private static String BASE_MIXIN_DIR = BASE_DIR + "/resources-mixins";

    @Inject
    private DefaultProjectBuilder projectBuilder;

    @Inject
    private MavenRepositorySystem repositorySystem;

        @Override
        protected Activation.Builder transformActivation_ActiveByDefault(
                Supplier<? extends Activation.Builder> creator, Activation.Builder builder, Activation target) {
            return builder;
        }

        @Override
        protected Activation.Builder transformActivation_File(
                Supplier<? extends Activation.Builder> creator, Activation.Builder builder, Activation target) {

                return xformed != path ? (builder != null ? builder : creator.get()).missing(xformed) : builder;
            }

            @Override
            protected ActivationFile.Builder transformActivationFile_Exists(
                    Supplier<? extends ActivationFile.Builder> creator,
                    ActivationFile.Builder builder,
                    ActivationFile target) {