Use Dependency Injection to register the editor metabox inside the Ad…

…min class

admin/class-admin.php

@@ -16,17 +16,29 @@
 class Admin {
 
 	/**
-	 * Class constructor.
+	 * Meta boxes instance.
+	 *
+	 * @since 1.10.0
+	 *
+	 * @var Meta_Boxes
 	 */
-	public function __construct() {
+	private Meta_Boxes $meta_boxes;
+
+	/**
+	 * Class constructor for injecting dependencies.
+	 *
+	 * @param Meta_Boxes|null $meta_boxes Meta boxes instance.
+	 */
+	public function __construct( Meta_Boxes $meta_boxes = null ) {
+		$this->meta_boxes = $meta_boxes;
 	}
 
 	/**
 	 * Initialize.
 	 *
 	 * @return void
 	 */
-	public function init() {
+	public function init(): void {
 
 		$update_database = new Update_Database();
 		$update_database->init_hooks();
@@ -44,14 +56,16 @@ public function init() {
 		$site_health_info->init_hooks();
 
 		$this->init_ajax();
+
+		$this->meta_boxes->init_hooks();
 	}
 
 	/**
 	 * Initialize ajax.
 	 *
 	 * @return void
 	 */
-	private function init_ajax() {
+	private function init_ajax(): void {
 		if ( ! defined( 'DOING_AJAX' ) || ! DOING_AJAX ) {
 			return;
 		}

includes/classes/class-plugin.php

@@ -8,6 +8,7 @@
 namespace EDAC\Inc;
 
 use EDAC\Admin\Admin;
+use EDAC\Admin\Meta_Boxes;
 
 /**
  * Main plugin functionality class.
@@ -19,7 +20,8 @@ class Plugin {
 	 */
 	public function __construct() {
 		if ( \is_admin() ) {
-			$admin = new Admin();
+			$meta_boxes = new Meta_Boxes();
+			$admin      = new Admin( $meta_boxes );
 			$admin->init();
 		} else {
 			$this->init();
@@ -36,9 +38,9 @@ public function __construct() {
 	 * @return void
 	 */
 	private function init() {
-		
+
 		add_action( 'wp_enqueue_scripts', array( 'EDAC\Inc\Enqueue_Frontend', 'enqueue' ) );
-		
+
 		$accessibility_statement = new Accessibility_Statement();
 		$accessibility_statement->init_hooks();
 

tests/phpunit/Admin/MetaBoxesTest.php

@@ -0,0 +1,77 @@
+<?php
+/**
+ * Test class for the editor metabox.
+ *
+ * @package Accessibility_Checker
+ */
+
+use EDAC\Admin\Admin;
+use EDAC\Admin\Meta_Boxes;
+
+/**
+ * Tests for the editor meta box class.
+ */
+class MetaBoxesTest extends WP_UnitTestCase {
+
+	/**
+	 * Test the hooks are added only in admin.
+	 *
+	 * @return void
+	 */
+	public function test_meta_boxes_are_registered_in_admin(): void {
+
+		$meta_boxes = $this->getMockBuilder( Meta_Boxes::class )
+			->onlyMethods( array( 'register_meta_boxes' ) )
+			->getMock();
+
+		$meta_boxes->expects( $this->once() )
+			->method( 'register_meta_boxes' );
+
+		$this->invoke_admin_init( $meta_boxes );
+		do_action( 'add_meta_boxes' );
+	}
+
+	/**
+	 * Test the init_hooks method.
+	 *
+	 * @return void
+	 */
+	public function test_init_hooks(): void {
+		$meta_boxes = new Meta_Boxes();
+		$meta_boxes->init_hooks();
+
+		$this->assertEquals(
+			10,
+			has_action(
+				'add_meta_boxes',
+				array(
+					$meta_boxes,
+					'register_meta_boxes',
+				)
+			)
+		);
+	}
+
+	/**
+	 * Test the render method.
+	 *
+	 * @return void
+	 */
+	public function test_render(): void {
+		$meta_boxes = new Meta_Boxes();
+		$meta_boxes->render();
+
+		$this->expectOutputRegex( '/^<div id="edac-tabs">/' );
+	}
+
+	/**
+	 * Invoke the admin init method.
+	 *
+	 * @param Meta_Boxes $meta_boxes The metabox class.
+	 * @return void
+	 */
+	private function invoke_admin_init( $meta_boxes ): void {
+		$admin = new Admin( $meta_boxes );
+		$admin->init();
+	}
+}