public function testGetSetNormalization()
 {
     $data_collection = new HeaderDataCollection();
     $this->assertInternalType('int', $data_collection->getNormalization());
     $data_collection->setNormalization(HeaderDataCollection::NORMALIZE_TRIM & HeaderDataCollection::NORMALIZE_CASE);
     $this->assertSame(HeaderDataCollection::NORMALIZE_TRIM & HeaderDataCollection::NORMALIZE_CASE, $data_collection->getNormalization());
 }