XML_Serializer::getSerializedData PHP Method

    function getSerializedData()
    {
        if ($this->_serializedData == null) {
            return $this->raiseError('No serialized data available. ' . 'Use XML_Serializer::serialize() first.', XML_SERIALIZER_ERROR_NO_SERIALIZATION);
        }
        return $this->_serializedData;
    }

 /**
  * Test serializing an object, that supports __sleep
  */
 public function testSleep()
 {
     $obj = new MyClass('foo', 'bar');
     $s = new XML_Serializer($this->options);
     $s->serialize($obj);
     $this->assertEquals('<MyClass><foo>foo</foo></MyClass>', $s->getSerializedData());
 }