allow phpunit 10, fix undefined property

Author: dbu

.gitignore

@@ -1 +1,2 @@
 derby.log
+composer.lock

composer.json

@@ -29,7 +29,7 @@
     "require": {
         "php": "^7.1 || ^8.0",
         "phpcr/phpcr-implementation": "2.1.*",
-        "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+        "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0 || ^10.0"
     },
     "autoload": {
         "psr-4": {

tests/NodeTypeDiscovery/NodeNodeTypeReadMethodsTest.php

@@ -34,6 +34,11 @@ class NodeNodeTypeReadMethodsTest extends BaseCase
      */
     protected $deepnode;
 
+    /**
+     * @var NodeInterface
+     */
+    protected $nodewithmixin;
+
     public function setUp(): void
     {
         parent::setUp();