text: <?php
  
  class Swift_MessageTest extends \PHPUnit\Framework\TestCase
  {
      public function testCloning()
      {
          $message1 = new Swift_Message('subj', 'body', 'ctype');
          $message2 = new Swift_Message('subj', 'body', 'ctype');
          $message1_clone = clone $message1;
  
          $this->recursiveObjectCloningCheck($message1, $message2, $message1_clone);
          // the test above will fail if the two messages are not identical
          $this->addToAssertionCount(1);
      }
  
      public function testCloningWithSigners()
      {
          $message1 = new Swift_Message('subj', 'body', 'ctype');
          $signer = new Swift_Signers_DKIMSigner(dirname(dirname(__DIR__)).'/_samples/dkim/dkim.test.priv', 'test.example', 'example');
          $message1->attachSigner($signer);
          $message2 = new Swift_Message('subj', 'body', 'ctype');
          $signer = new Swift_Signers_DKIMSigner(dirname(dirname(__DIR__)).'/_samples/dkim/dkim.test.priv', 'test.example', 'example');
          $message2->attachSigner($signer);
          $message1_clone = clone $message1;
  
          $this->recursiveObjectCloningCheck($message1, $message2, $message1_clone);
          // the test above will fail if the two messages are not identical
          $this->addToAssertionCount(1);
      }
  
      public function testBodySwap()
      {
          $message1 = new Swift_Message('Test');
          $html = new Swift_MimePart('<html></html>', 'text/html');
          $html->getHeaders()->addTextHeader('X-Test-Remove', 'Test-Value');
          $html->getHeaders()->addTextHeader('X-Test-Alter', 'Test-Value');
          $message1->attach($html);
          $source = $message1->toString();
          $message2 = clone $message1;
          $message2->setSubject('Message2');
          foreach ($message2->getChildren() as $child) {
              $child->setBody('Test');
              $child->getHeaders()->removeAll('X-Test-Remove');
              $child->getHeaders()->get('X-Test-Alter')->setValue('Altered');
          }
          $final = $message1->toString();
          if ($source != $final) {
              $this->fail("Difference although object cloned \n [".$source."]\n[".$final."]\n");
          }
          $final = $message2->toString();
          if ($final == $source) {
              $this->fail('Two body matches although they should differ'."\n [".$source."]\n[".$final."]\n");
          }
          $id_1 = $message1->getId();
          $id_2 = $message2->getId();
          $this->assertEquals($id_1, $id_2, 'Message Ids differ');
          $id_2 = $message2->generateId();
          $this->assertNotEquals($id_1, $id_2, 'Message Ids are the same');
      }
  
      protected function recursiveObjectCloningCheck($obj1, $obj2, $obj1_clone)
      {
          $obj1_properties = (array) $obj1;
          $obj2_properties = (array) $obj2;
          $obj1_clone_properties = (array) $obj1_clone;
  
          foreach ($obj1_properties as $property => $value) {
              if (is_object($value)) {
                  $obj1_value = $obj1_properties[$property];
                  $obj2_value = $obj2_properties[$property];
                  $obj1_clone_value = $obj1_clone_properties[$property];
  
                  if ($obj1_value !== $obj2_value) {
                      // two separetely instanciated objects property not referencing same object
                      $this->assertFalse(
                          // but object's clone does - not everything copied
                          $obj1_value === $obj1_clone_value,
                          "Property `$property` cloning error: source and cloned objects property is referencing same object"
                      );
                  } else {
                      // two separetely instanciated objects have same reference
                      $this->assertFalse(
                          // but object's clone doesn't - overdone making copies
                          $obj1_value !== $obj1_clone_value,
                          "Property `$property` not properly cloned: it should reference same object as cloning source (overdone copping)"
                      );
                  }
                  // recurse
                  $this->recursiveObjectCloningCheck($obj1_value, $obj2_value, $obj1_clone_value);
              } elseif (is_array($value)) {
                  $obj1_value = $obj1_properties[$property];
                  $obj2_value = $obj2_properties[$property];
                  $obj1_clone_value = $obj1_clone_properties[$property];
  
                  return $this->recursiveArrayCloningCheck($obj1_value, $obj2_value, $obj1_clone_value);
              }
          }
      }
  
      protected function recursiveArrayCloningCheck($array1, $array2, $array1_clone)
      {
          foreach ($array1 as $key => $value) {
              if (is_object($value)) {
                  $arr1_value = $array1[$key];
                  $arr2_value = $array2[$key];
                  $arr1_clone_value = $array1_clone[$key];
                  if ($arr1_value !== $arr2_value) {
                      // two separetely instanciated objects property not referencing same object
                      $this->assertFalse(
                          // but object's clone does - not everything copied
                          $arr1_value === $arr1_clone_value,
                          "Key `$key` cloning error: source and cloned objects property is referencing same object"
                      );
                  } else {
                      // two separetely instanciated objects have same reference
                      $this->assertFalse(
                          // but object's clone doesn't - overdone making copies
                          $arr1_value !== $arr1_clone_value,
                          "Key `$key` not properly cloned: it should reference same object as cloning source (overdone copping)"
                      );
                  }
                  // recurse
                  $this->recursiveObjectCloningCheck($arr1_value, $arr2_value, $arr1_clone_value);
              } elseif (is_array($value)) {
                  $arr1_value = $array1[$key];
                  $arr2_value = $array2[$key];
                  $arr1_clone_value = $array1_clone[$key];
  
                  return $this->recursiveArrayCloningCheck($arr1_value, $arr2_value, $arr1_clone_value);
              }
          }
      }
  }
  