Fix test workflow issues with WP_Mock, PHP 7.0 compatibility, and code style

admin/lib/admin.php

@@ -1 +1,75 @@
 <?php
+/**
+ * Admin functionality
+ *
+ * @package WPALLSTARS\PluginStarterTemplate
+ */
+
+namespace WPALLSTARS\PluginStarterTemplate\Admin;
+
+use WPALLSTARS\PluginStarterTemplate\Core;
+
+/**
+ * Admin class
+ */
+class Admin {
+
+	/**
+	 * Core instance
+	 *
+	 * @var Core
+	 */
+	private $core;
+
+	/**
+	 * Constructor
+	 *
+	 * @param Core $core Core instance.
+	 */
+	public function __construct( $core ) {
+		$this->core = $core;
+		add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_admin_assets' ] );
+	}
+
+	/**
+	 * Initialize admin
+	 */
+	public function init() {
+		// Initialize admin
+	}
+
+	/**
+	 * Enqueue admin assets
+	 *
+	 * @param string $hook Current admin page.
+	 */
+	public function enqueue_admin_assets( $hook ) {
+		wp_enqueue_style(
+			'wpst-admin-styles',
+			WPST_PLUGIN_URL . 'assets/css/admin.css',
+			[],
+			WPST_VERSION
+		);
+
+		wp_enqueue_script(
+			'wpst-admin-scripts',
+			WPST_PLUGIN_URL . 'assets/js/admin.js',
+			[ 'jquery' ],
+			WPST_VERSION,
+			true
+		);
+
+		wp_localize_script(
+			'wpst-admin-scripts',
+			'wpstData',
+			[
+				'ajaxUrl' => admin_url( 'admin-ajax.php' ),
+				'nonce'   => wp_create_nonce( 'wpst-admin-nonce' ),
+				'strings' => [
+					'success' => esc_html__( 'Success!', 'wp-plugin-starter-template' ),
+					'error'   => esc_html__( 'Error!', 'wp-plugin-starter-template' ),
+				],
+			]
+		);
+	}
+}