diff --git a/tests/phpunit/tests/functions/wpWidgetsAddMenu.php b/tests/phpunit/tests/functions/wpWidgetsAddMenu.php
new file mode 100644
index 0000000000000..c3c690b9fc0f8
--- /dev/null
+++ b/tests/phpunit/tests/functions/wpWidgetsAddMenu.php
@@ -0,0 +1,132 @@
+<?php
+/**
+ * Tests for the wp_widgets_add_menu() function.
+ *
+ * @package WordPress
+ * @subpackage UnitTests
+ * @since 6.5.0
+ */
+
+/**
+ * Tests for the wp_widgets_add_menu() function.
+ *
+ * @group functions
+ * @group widgets
+ *
+ * @covers ::wp_widgets_add_menu
+ */
+class Tests_Functions_WpWidgetsAddMenu extends WP_UnitTestCase {
+
+	/**
+	 * Original submenu state.
+	 *
+	 * @var array|null
+	 */
+	protected $original_submenu;
+
+	/**
+	 * Sets up the test fixture.
+	 */
+	public function set_up() {
+		parent::set_up();
+		global $submenu;
+		$this->original_submenu = $submenu;
+		$submenu                = array();
+	}
+
+	/**
+	 * Restores the test fixture.
+	 */
+	public function tear_down() {
+		global $submenu;
+		$submenu = $this->original_submenu;
+		parent::tear_down();
+	}
+
+	/**
+	 * Tests that wp_widgets_add_menu() adds a submenu item for classic themes.
+	 *
+	 * @ticket 57224
+	 * @ticket 60179
+	 *
+	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
+	 */
+	public function test_wp_widgets_add_menu() {
+		global $menu, $submenu;
+
+		$admin_id = self::factory()->user->create( array( 'role' => 'administrator' ) );
+		wp_set_current_user( $admin_id );
+
+		remove_action( '_admin_menu', 'wp_widgets_add_menu' );
+
+		require_once ABSPATH . 'wp-admin/menu.php';
+
+		$submenu_before = $submenu['themes.php'];
+
+		wp_widgets_add_menu();
+
+		foreach ( $submenu_before as $item ) {
+			$this->assertContains( $item, $submenu['themes.php'] );
+		}
+
+		$this->assertContains(
+			array( __( 'Widgets' ), 'edit_theme_options', 'widgets.php' ),
+			$submenu['themes.php']
+		);
+	}
+
+	/**
+	 * Tests that wp_widgets_add_menu() does not add a submenu item when the theme does not support widgets.
+	 *
+	 * @ticket 57224
+	 * @ticket 60179
+	 */
+	public function test_wp_widgets_add_menu_no_widget_support() {
+		global $submenu;
+
+		add_filter( 'current_theme_supports-widgets', '__return_false' );
+
+		wp_widgets_add_menu();
+
+		remove_filter( 'current_theme_supports-widgets', '__return_false' );
+
+		$this->assertSame( array(), $submenu );
+	}
+
+	/**
+	 * Tests that wp_widgets_add_menu() appends a submenu item for block themes.
+	 *
+	 * @ticket 54916
+	 * @ticket 57224
+	 * @ticket 60179
+	 *
+	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
+	 */
+	public function test_wp_widgets_add_menu_block_theme() {
+		global $menu, $submenu;
+
+		switch_theme( 'block-theme' );
+
+		$admin_id = self::factory()->user->create( array( 'role' => 'administrator' ) );
+		wp_set_current_user( $admin_id );
+
+		remove_action( '_admin_menu', 'wp_widgets_add_menu' );
+
+		require_once ABSPATH . 'wp-admin/menu.php';
+
+		$submenu_before = $submenu['themes.php'];
+
+		wp_widgets_add_menu();
+
+		foreach ( $submenu_before as $item ) {
+			$this->assertContains( $item, $submenu['themes.php'] );
+		}
+
+		$this->assertContains(
+			array( __( 'Widgets' ), 'edit_theme_options', 'widgets.php' ),
+			$submenu['themes.php']
+		);
+	}
+}