fix phpstan, add class

Core/src/Testing/Reflection/ReflectionHandlerV5.php

@@ -115,7 +115,9 @@ protected function createParser()
      */
     protected function getAdditionalStrategies()
     {
-        return [new Factory\Argument(new PrettyPrinter())];
+        return [
+            new Factory\Argument(new PrettyPrinter()) // @phpstan-ignore-line
+        ];
     }
 
     /**

Core/src/Testing/Reflection/ReflectionHandlerV6.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace Google\Cloud\Core\Testing\Reflection;
+
+use PhpParser\ParserFactory;
+use PhpParser\PhpVersion;
+
+/**
+ * Class for running snippets using phpdocumentor/reflection:v6.
+ *
+ * @internal
+ */
+class ReflectionHandlerV6 extends ReflectionHandlerV5
+{
+    /**
+     * @see ReflectionHandlerV5
+     */
+    protected function createParser()
+    {
+        $phpVersion = PhpVersion::fromString('8.1');  // PHP 8.1.0
+        return (new ParserFactory())->createForVersion($phpVersion);
+    }
+
+    /**
+     * @see ReflectionHandlerV5
+     */
+    protected function getAdditionalStrategies()
+    {
+        return [];
+    }
+}