Add PHPUnit tests for wp_maybe_load_widgets function

tests/phpunit/tests/functions/wpMaybeLoadWidgets.php

@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * Tests for the wp_maybe_load_widgets function.
+ *
+ * @group Functions
+ *
+ * @covers ::wp_maybe_load_widgets
+ */
+class Tests_Functions_wpMaybeLoadWidgets extends WP_UnitTestCase {
+
+	public $submenu;
+
+	public function set_up() {
+		global $submenu;
+		$this->submenu = $submenu;
+		$submenu       = null;
+	}
+
+	public function tear_down() {
+		global $submenu;
+		$submenu = $this->submenu;
+	}
+
+	/**
+	 * @ticket 60180
+	 */
+	public function test_wp_maybe_load_widgets() {
+
+		wp_maybe_load_widgets();
+
+		$this->assertSame( 10, has_action( '_admin_menu', 'wp_widgets_add_menu' ) );
+	}
+
+	public function test_wp_maybe_load_widgets_no_default_widgets() {
+		global $submenu;
+
+		add_filter( 'load_default_widgets', '__return_false' );
+
+		wp_maybe_load_widgets();
+
+		remove_filter( 'load_default_widgets', '__return_false' );
+
+		$this->assertSame( 10, has_action( '_admin_menu', 'wp_widgets_add_menu' ) );
+	}
+
+}