public function testGetArchiveReturnsExistingArchive()
 {
     $a = new ArchivableTest10();
     $a->setTitle('foo');
     $a->setAge(12);
     $a->save();
     $archive = new ArchivableTest10Archive();
     $archive->setId($a->getId());
     $archive->setTitle('bar');
     $archive->save();
     $this->assertSame($archive, $a->getArchive());
 }