}

    @Test
    void testBuildRequestWithUserToolchains() throws Exception {
        Properties props = new Properties();
        props.put("key", "user_value");
        ToolchainModel toolchain = new ToolchainModel();
        toolchain.setType("TYPE");
        toolchain.setProvides(props);
        PersistedToolchains persistedToolchains = new PersistedToolchains();

    @Test
    void testModelAndFactory() {
        MavenSession session = mock(MavenSession.class);
        List<ToolchainModel> toolchainModels = List.of(
                ToolchainModel.newBuilder().type("basic").build(),
                ToolchainModel.newBuilder().type("basic").build(),
                ToolchainModel.newBuilder().type("rare").build());
        Session sessionv4 = mock(Session.class);

                public org.apache.maven.api.Toolchain createToolchain(
                        @Nonnull org.apache.maven.api.toolchain.ToolchainModel model) throws ToolchainFactoryException {
                    try {
                        return getToolchainV4(v3Factory.createToolchain(new ToolchainModel(model)));
                    } catch (MisconfiguredToolchainException e) {
                        throw new RuntimeException(e);

        return builderId;
    }

    @Override
    public Map<String, List<ToolchainModel>> getToolchains() {
        if (toolchains == null) {
            toolchains = new HashMap<>();
        }
        return toolchains;
    }

    @Override
    public MavenExecutionRequest setToolchains(Map<String, List<ToolchainModel>> toolchains) {
        this.toolchains = toolchains;
        return this;
    }

     * @return this request
     * @since 3.3.0
     */
    MavenExecutionRequest setToolchains(Map<String, List<ToolchainModel>> toolchains);

    /**
     *
     * @return all toolchains grouped by type, never {@code null}
     * @since 3.3.0
     */
    Map<String, List<ToolchainModel>> getToolchains();

    /**
     * @since 3.3.0
     * @deprecated use {@link #setRootDirectory(Path)} instead
     */

              <exclude>org.apache.maven.toolchain.DefaultToolchain#DefaultToolchain(org.apache.maven.toolchain.model.ToolchainModel,org.codehaus.plexus.logging.Logger):CONSTRUCTOR_REMOVED</exclude>
              <exclude>org.apache.maven.toolchain.DefaultToolchain#DefaultToolchain(org.apache.maven.toolchain.model.ToolchainModel,java.lang.String,org.codehaus.plexus.logging.Logger):CONSTRUCTOR_REMOVED</exclude>

                Optional.ofNullable(context.effectiveToolchains).map(PersistedToolchains::getToolchains).stream()
                        .flatMap(List::stream)
                        .map(ToolchainModel::new)
                        .collect(Collectors.groupingBy(ToolchainModel::getType)));

        request.setNoSnapshotUpdates(context.options().suppressSnapshotUpdates().orElse(false));
        request.setGoals(context.options().goals().orElse(List.of()));

import org.apache.maven.api.services.DependencyCoordinatesFactory;
import org.apache.maven.api.services.VersionResolverException;
import org.apache.maven.api.settings.Settings;
import org.apache.maven.api.toolchain.ToolchainModel;

/**
 * The session to install / deploy / resolve artifacts and dependencies.
 *
 * @since 4.0.0
 */
@Experimental
@ThreadSafe
public interface Session extends ProtoSession {

    /**