component.getMainFeature().withApi();

        // Make compileOnlyApi visible to tests.
        JvmTestSuite defaultTestSuite = JavaPluginHelper.getDefaultTestSuite(project);
        project.getConfigurations()
            .getByName(defaultTestSuite.getSources().getCompileOnlyConfigurationName())
            .extendsFrom(component.getMainFeature().getCompileOnlyApiConfiguration());

    /**
     * Gets the default test suite. This method assumes the Java plugin is applied.
     *
     * @throws GradleException If the default test suite does not exist.
     */
    public static JvmTestSuite getDefaultTestSuite(Project project) {
        String message = "The Java plugin must be applied to access the default test suite.";

        TestingExtension testing = project.getExtensions().findByType(TestingExtension.class);

        feature.getApiConfiguration().getDependencies().add(dependencies.create(project));

        // The tests depend on the test fixtures.
        SourceSet testSourceSet = JavaPluginHelper.getDefaultTestSuite(project).getSources();
        Configuration testImplementation = project.getConfigurations().getByName(testSourceSet.getImplementationConfigurationName());

        mainFeature.getRuntimeElementsConfiguration().extendsFrom(providedRuntimeConfiguration);

        JvmTestSuite defaultTestSuite = JavaPluginHelper.getDefaultTestSuite(project);
        configurationContainer.getByName(defaultTestSuite.getSources().getRuntimeClasspathConfigurationName()).extendsFrom(providedRuntimeConfiguration);
    }

        SourceSet defaultPluginSourceSet = JavaPluginHelper.getJavaComponent(project).getMainFeature().getSourceSet();
        SourceSet defaultTestSourceSet = JavaPluginHelper.getDefaultTestSuite(project).getSources();
        return project.getExtensions().create(EXTENSION_NAME, GradlePluginDevelopmentExtension.class, project, defaultPluginSourceSet, defaultTestSourceSet);
    }

    private void configureIdeaModuleForJava(final Project project) {
        JvmFeatureInternal mainFeature = JavaPluginHelper.getJavaComponent(project).getMainFeature();
        JvmTestSuite defaultTestSuite = JavaPluginHelper.getDefaultTestSuite(project);

        project.getTasks().withType(GenerateIdeaModule.class).configureEach(ideaModule -> {
            // Dependencies
            ideaModule.dependsOn((Callable<FileCollection>) () ->