Add link to settings page on plugin page

ad-code-manager.php

@@ -27,6 +27,7 @@
 namespace Automattic\AdCodeManager;
 
 use Ad_Code_Manager;
+use Automattic\AdCodeManager\UI\Plugin_Actions;
 
 const AD_CODE_MANAGER_VERSION = '0.5';
 const AD_CODE_MANAGER_FILE    = __FILE__;
@@ -36,11 +37,20 @@
 require_once __DIR__ . '/src/class-acm-widget.php';
 require_once __DIR__ . '/src/markdown.php';
 require_once __DIR__ . '/src/class-ad-code-manager.php';
+require_once __DIR__ . '/src/UI/class-plugin-actions.php';
 
 add_action(
 	'plugins_loaded',
 	function () {
 		$GLOBALS['ad_code_manager'] = new Ad_Code_Manager();
 		$GLOBALS['ad_code_manager']->run();
-	} 
+	}
+);
+
+add_action(
+	'admin_init',
+	function () {
+		$plugin_actions = new Plugin_Actions();
+		$plugin_actions->run();
+	}
 );

src/UI/class-plugin-actions.php

@@ -0,0 +1,48 @@
+<?php
+/**
+ * Ad Code Manager plugins actions class
+ *
+ * @package Automattic\AdCodeManager
+ * @since 0.6.0
+ */
+
+declare(strict_types=1);
+
+namespace Automattic\AdCodeManager\UI;
+
+use const Automattic\AdCodeManager\AD_CODE_MANAGER_FILE;
+
+/**
+ * User Interface changes for the plugins actions.
+ *
+ * @since 0.6.0
+ */
+final class Plugin_Actions {
+
+	/**
+	 * Register action and filter hook callbacks.
+	 *
+	 * @return void
+	 */
+	public function run(): void {
+		add_filter( 'plugin_action_links_' . plugin_basename( AD_CODE_MANAGER_FILE ), array( $this, 'add_plugin_meta_links' ) );
+	}
+
+	/**
+	 * Adds a 'Settings' action link to the Plugins screen in WP admin.
+	 *
+	 * @param array $actions An array of plugin action links. By default, this can include 'activate',
+	 *                       'deactivate', and 'delete'. With Multisite active this can also include
+	 *                       'network_active' and 'network_only' items.
+	 * @return array
+	 */
+	public function add_plugin_meta_links( array $actions ): array {
+		$actions['settings'] = sprintf(
+			'<a href="%s">%s</a>',
+			esc_url( get_admin_url( null, 'options-general.php?page=ad-code-manager' ) ),
+			esc_html__( 'Settings', 'ad-code-manager' )
+		);
+
+		return $actions;
+	}
+}

tests/Integration/UI/PluginActionsTest.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * UI Tests for the plugin actions
+ *
+ * @package Automattic\AdCodeManager\Tests\UI
+ */
+
+declare(strict_types=1);
+
+namespace Automattic\AdCodeManager\Tests\Integration\UI;
+
+use Automattic\AdCodeManager\Tests\Integration\TestCase;
+use Automattic\AdCodeManager\UI\Plugin_Actions;
+
+use const Automattic\AdCodeManager\AD_CODE_MANAGER_FILE;
+
+/**
+ * UI Tests for the plugin screen.
+ */
+final class PluginActionsTest extends TestCase {
+	/**
+	 * Check that plugins screen will add a hook to change the plugin action links.
+	 *
+	 * @covers \Automattic\AdCodeManager\UI\Plugin_Actions::run
+	 * @group ui
+	 */
+	public function test_plugins_screen_has_filter_to_add_a_settings_action_link(): void {
+		$plugins_screen = new Plugin_Actions();
+		$plugins_screen->run();
+
+		self::assertNotFalse( has_filter( 'plugin_action_links_' . plugin_basename( AD_CODE_MANAGER_FILE ), array( $plugins_screen, 'add_plugin_meta_links' ) ) );
+	}
+
+	/**
+	 * Check that plugins screen will add a hook to change the plugin action links.
+	 *
+	 * @covers Automattic\AdCodeManager\UI\Plugin_Actions::run
+	 * @covers Automattic\AdCodeManager\UI\Plugin_Actions::add_plugin_meta_links
+	 * @group ui
+	 */
+	public function test_plugins_screen_adds_a_settings_action_link(): void {
+		$actions = array();
+		$actions = ( new Plugin_Actions() )->add_plugin_meta_links( $actions );
+
+		self::assertCount( 1, $actions );
+	}
+}