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

        repository.applyResumptionProperties(request, properties);

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

    @Test
    void resumeFromPropertyDoesNotOverrideExistingRequestParameters() {
        MavenExecutionRequest request = new DefaultMavenExecutionRequest();

        return getProjectSelectors(pa -> !pa.optional() && pa.active());
    }

    /**
     * @return Optional active project selectors, never {@code null}.
     */
    public Set<String> getOptionalActiveProjectSelectors() {
        return getProjectSelectors(pa -> pa.optional() && pa.active());
    }

    /**
     * @return Required inactive project selectors, never {@code null}.
     */

        Set<String> requiredSelectors = projectActivation.getRequiredActiveProjectSelectors();
        Set<String> optionalSelectors = projectActivation.getOptionalActiveProjectSelectors();
        if (!requiredSelectors.isEmpty() || !optionalSelectors.isEmpty()) {
            Set<MavenProject> selectedProjects =

        assertContainsExactlyInAnyOrder(activation.getRequiredActiveProjectSelectors(), "test1", "test2");
        assertContainsExactlyInAnyOrder(activation.getOptionalActiveProjectSelectors(), "test3", "test4");

        activation = new ProjectActivation();
        performProjectActivation(
                parser.parse(options, new String[] {"-pl", "!test1,-test2,-?test3,!?test4"}), activation);

        final ProjectActivation projectActivation = request.getProjectActivation();
        final Set<String> allOptionalSelectors = new HashSet<>();
        allOptionalSelectors.addAll(projectActivation.getOptionalActiveProjectSelectors());
        allOptionalSelectors.addAll(projectActivation.getRequiredActiveProjectSelectors());
        // We intentionally ignore the results of this method.