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

includes/updater.php

@@ -1 +1,58 @@
 <?php
+/**
+ * Updater functionality for the plugin
+ *
+ * @package WPALLSTARS\PluginStarterTemplate
+ */
+
+namespace WPALLSTARS\PluginStarterTemplate;
+
+/**
+ * Updater class
+ */
+class Updater {
+
+	/**
+	 * Plugin file
+	 *
+	 * @var string
+	 */
+	private $plugin_file;
+
+	/**
+	 * Constructor
+	 *
+	 * @param string $plugin_file Main plugin file path.
+	 */
+	public function __construct($plugin_file) {
+		$this->plugin_file = $plugin_file;
+		$this->init();
+	}
+
+	/**
+	 * Initialize the updater
+	 */
+	public function init() {
+		add_filter('plugin_action_links_' . plugin_basename($this->plugin_file), array($this, 'add_update_source_link'));
+		add_action('admin_post_wpst_update_source', array($this, 'handle_update_source'));
+	}
+
+	/**
+	 * Add update source link to plugin actions
+	 *
+	 * @param array $links Plugin action links.
+	 * @return array Modified plugin action links.
+	 */
+	public function add_update_source_link($links) {
+		$update_source_link = '<a href="' . admin_url('admin-post.php?action=wpst_update_source&plugin=' . plugin_basename($this->plugin_file)) . '">' . esc_html__('Update Source', 'wp-plugin-starter-template') . '</a>';
+		array_unshift($links, $update_source_link);
+		return $links;
+	}
+
+	/**
+	 * Handle update source selection
+	 */
+	public function handle_update_source() {
+		// Handle update source selection.
+	}
+}