ReflectionProperty: PHP < 8.1 needs explicit accessibility permission

Author: Slamdunk

tests/tests/Report/PhpTest.php

@@ -53,6 +53,7 @@ public function testCacheDataNeverGetSaved(): void
         $coverage->getReport();
 
         $refProperty = new ReflectionProperty($coverage, 'cachedReport');
+        $refProperty->setAccessible(true);
 
         $this->assertNotNull($refProperty->getValue($coverage));