/**
     * Persists any data needed to resume the build at a later point in time, using a new Maven invocation. This method
     * may also decide it is not needed or meaningful to persist such data, and return <code>false</code> to indicate
     * so.
     *
     * @param rootProject The root project that is being built.
     * @param buildResumptionData Information needed to resume the build.

The .mvn directory is needed to be able to use the ${maven.multiModuleProjectDirectory} property....

     * TODO this should only be needed on the repository metadata {@link org.apache.maven.artifact.metadata.ArtifactMetadata}
     *
     * @param metadata the new metadata
     */
    void merge(ArtifactMetadata metadata);

    /**
     * Store the metadata in the local repository.
     * TODO this should only be needed on the repository metadata {@link org.apache.maven.artifact.metadata.ArtifactMetadata}

     *
     * <p>This map may contain null values if the constructor was invoked with {@code resolve}
     * parameter set to false. This is more efficient when only the module existence needs to
     * be tested, and module descriptors are not needed.</p>
     *
     * @see #getModuleNames()
     */
    private final Map<Path, String> descriptors;

    /**

        projectParent.setCollectedProjects(singletonList(projectModuleD));

        // Set up needed mocks
        when(session.getRequest()).thenReturn(mavenExecutionRequest);
        when(session.getProjects()).thenReturn(null); // needed, otherwise it will be an empty list by default
        when(mavenExecutionRequest.getProjectBuildingRequest()).thenReturn(mock(ProjectBuildingRequest.class));

        this.lifecycleDebugLogger = lifecycleDebugLogger;
        this.lifeCycleExecutionPlanCalculator = lifeCycleExecutionPlanCalculator;
        this.eventCatapult = eventCatapult;
    }

    /**
     * Ctor needed for UT.
     */
    BuilderCommon(
            LifecycleDebugLogger lifecycleDebugLogger,
            LifecycleExecutionPlanCalculator lifeCycleExecutionPlanCalculator,
            ExecutionEventCatapult eventCatapult,

In the next test that same "live implementation" will be used in a stub version instead.

Not all live services have stubs, but can be added as needed.
</body>

 * of the execution plan instead, which seems much nicer.
 * </p>
 * <p>
 * Additionally this class contains a clone of the MavenSession, which is *only* needed
 * because it has as notion of a "current" project.
 * </p>
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 *
 * @since 3.0
 */

    protected final Logger logger; // TODO this class is extended, needs refactoring

    final Map<String, ToolchainFactory> factories;

    @Inject
    public DefaultToolchainManager(Map<String, ToolchainFactory> factories) {
        this.factories = factories;
        this.logger = LoggerFactory.getLogger(DefaultToolchainManager.class);
    }

    /**
     * Ctor needed for UT.
     */

     */
    private final Map<Path, PathModularization> moduleInfo;

    /**
     * Whether JAR files are modular. This map is redundant with {@link #moduleInfo},
     * but cheaper to compute when the module names are not needed.
     *
     * @see #getPathType(Path)
     */
    private final Map<Path, PathType> pathTypes;

    /**
     * Creates an initially empty cache.
     */
    PathModularizationCache() {