this.classifier = classifier;
            return this;
        }

        public ArtifactFactoryRequestBuilder extension(String extension) {
            this.extension = extension;
            return this;
        }

        public ArtifactFactoryRequestBuilder type(String type) {
            this.type = type;
            return this;
        }

            this.classifier = classifier;
            return this;
        }

        public ArtifactFactoryRequestBuilder extension(String extension) {
            this.extension = extension;
            return this;
        }

        public ArtifactFactoryRequestBuilder type(String type) {
            this.type = type;
            return this;
        }

        GradleDocumentationExtension extension = project.getExtensions().getByType(GradleDocumentationExtension.class);
        generateDslReference(project, layout, tasks, objects, extension);
    }

    private void generateDslReference(Project project, ProjectLayout layout, TaskContainer tasks, ObjectFactory objects, GradleDocumentationExtension extension) {
        DslReference dslReference = extension.getDslReference();

            this.classifier = classifier;
            return this;
        }

        public DependencyCoordinatesFactoryRequestBuilder extension(String extension) {
            this.extension = extension;
            return this;
        }

        public DependencyCoordinatesFactoryRequestBuilder type(String type) {
            this.type = type;
            return this;

        GradleDocumentationExtension extension = project.getExtensions().getByType(GradleDocumentationExtension.class);
        generateDefaultImports(project, tasks, extension);
        generateUserManual(project, tasks, layout, extension);

        checkXrefLinksInUserManualAreValid(layout, tasks, extension);
        checkMultiLangSnippetsAreValid(layout, tasks, extension);

     * @param extension
     *            The extension.
     * @return The resource path.
     */
    public static String getResourcePath(final String path, final String extension) {
        assertArgumentNotNull("path", path);

        if (extension == null) {
            return path;
        }
        final String ext = "." + extension;
        if (path.endsWith(ext)) {

            releaseNotes.getBaseCssFile().convention(extension.getSourceRoot().file("css/base.css"));
            releaseNotes.getReleaseNotesCssFile().convention(extension.getSourceRoot().file("css/release-notes.css"));
            releaseNotes.getReleaseNotesJsFile().convention(extension.getSourceRoot().file("release/content/releaseIssues.js"));
            releaseNotes.getReleaseNotesAssets().convention(extension.getSourceRoot().dir("release/release-notes-assets"));

        private final TestRerunTaskExtension extension;

        InitTaskAction(TestRerunTaskExtension extension) {
            this.extension = extension;
        }

        @Override
        public void execute(Task task) {
            RerunTestExecuter retryTestExecuter = createRetryTestExecuter(task, extension);
            setTestExecuter(task, retryTestExecuter);
        }
    }

        this.artifactId = (artifactId != null && !artifactId.isEmpty()) ? artifactId : null;
        this.classifier = (classifier != null && !classifier.isEmpty()) ? classifier : null;
        this.extension = (extension != null && !extension.isEmpty()) ? extension : null;
        this.version = (version != null && !version.isEmpty()) ? version : null;
        this.message = (message != null && !message.isEmpty()) ? message : null;
    }

    @Override

import static org.junit.jupiter.api.Assertions.assertTrue;

/**
 * Tests {@code Extension}.
 *
 */
class ExtensionTest {

    @Test
    void testHashCodeNullSafe() {
        new Extension().hashCode();
    }

    @Test
    void testEqualsNullSafe() {
        assertFalse(new Extension().equals(null));

        new Extension().equals(new Extension());
    }

    @Test
    void testEqualsIdentity() {