fixed #5614

Author: ptomulik

src/Framework/TestCase.php

@@ -1836,16 +1836,17 @@ private function registerMockObjectsFromTestArguments(array $testArguments, Cont
                 }
             }
         } else {
-            foreach ($testArguments as $testArgument) {
+            foreach ($testArguments as &$testArgument) {
                 if ($testArgument instanceof MockObject) {
                     $testArgument = Cloner::clone($testArgument);
 
                     $this->registerMockObject($testArgument);
                 } elseif (is_array($testArgument) && !$context->contains($testArgument)) {
+                    $testArgumentCopy = $testArgument;
                     $context->add($testArgument);
 
                     $this->registerMockObjectsFromTestArguments(
-                        $testArgument,
+                        $testArgumentCopy,
                         $context,
                     );
                 }