[OptionsResolver] Assert that the error type is valid in deprecations test

Author: fancyweb

Tests/OptionsResolverTest.php

@@ -518,7 +518,9 @@ public function testDeprecationMessages(\Closure $configureOptions, array $optio
     {
         $count = 0;
         error_clear_last();
-        set_error_handler(function () use (&$count) {
+        set_error_handler(function (int $type) use (&$count) {
+            $this->assertSame(\E_USER_DEPRECATED, $type);
+
             ++$count;
 
             return false;