Properties properties = new Properties();
        properties.setProperty("remainingProjects", ":module-a");

        repository.applyResumptionProperties(request, properties);

        assertThat(request.getProjectActivation().getOptionalActiveProjectSelectors(), is(singleton(":module-a")));
    }

    @Test
    void resumeFromPropertyDoesNotOverrideExistingRequestParameters() {

    String getReactorFailureBehavior();

    /**
     * @deprecated Since Maven 4: use {@link #getProjectActivation()}.
     */
    @Deprecated
    MavenExecutionRequest setSelectedProjects(List<String> projects);

    /**
     * @deprecated Since Maven 4: use {@link #getProjectActivation()}.
     */
    @Deprecated
    List<String> getSelectedProjects();

    /**

            MavenExecutionRequest request)
            throws MavenExecutionException {
        List<MavenProject> result = projects;

        ProjectActivation projectActivation = request.getProjectActivation();
        Set<String> requiredSelectors = projectActivation.getRequiredActiveProjectSelectors();
        Set<String> optionalSelectors = projectActivation.getOptionalActiveProjectSelectors();

            throws ProjectBuildingException {
        ProjectBuildingRequest projectBuildingRequest = request.getProjectBuildingRequest();

        boolean hasProjectSelection = !request.getProjectActivation().isEmpty();
        boolean isRecursive = hasProjectSelection || request.isRecursive();
        List<ProjectBuildingResult> results = projectBuilder.build(files, isRecursive, projectBuildingRequest);

            Stream.of(propertyValue.split(PROPERTY_DELIMITER))
                    .filter(str -> str != null && !str.isEmpty())
                    .forEach(request.getProjectActivation()::activateOptionalProject);
            LOGGER.info("Resuming from {} due to the --resume / -r feature.", propertyValue);
        }
    }

        parameterInactiveOptionalProjects.forEach(projectActivation::deactivateOptionalProject);

        when(mavenExecutionRequest.getProjectActivation()).thenReturn(projectActivation);
        when(mavenExecutionRequest.getMakeBehavior()).thenReturn(parameterMakeBehavior);
        when(mavenExecutionRequest.getPom()).thenReturn(parameterRequestedPom);

            this.profileActivation.overwriteInactiveProfiles(inactiveProfiles);
        }

        return this;
    }

    @Override
    public ProjectActivation getProjectActivation() {
        return this.projectActivation;
    }

    @Override
    public ProfileActivation getProfileActivation() {
        return this.profileActivation;
    }

    @Override

     * @param session the {@link MavenSession}.
     */
    private void validateOptionalProjects(MavenExecutionRequest request, MavenSession session) {
        final ProjectActivation projectActivation = request.getProjectActivation();
        final Set<String> allOptionalSelectors = new HashSet<>();
        allOptionalSelectors.addAll(projectActivation.getOptionalActiveProjectSelectors());