public function findIdentifiersByTagFindsCacheEntriesWithSpecifiedTag()
{
$backend = $this->setUpBackend();
$data = 'Some data';
$identifier = 'MyIdentifier' . md5(uniqid(mt_rand(), true));
$backend->set($identifier, $data, ['UnitTestTag%tag1', 'UnitTestTag%tag2']);
$retrieved = $backend->findIdentifiersByTag('UnitTestTag%tag1');
$this->assertEquals($identifier, $retrieved[0], 'Could not retrieve expected entry by tag.');
$retrieved = $backend->findIdentifiersByTag('UnitTestTag%tag2');
$this->assertEquals($identifier, $retrieved[0], 'Could not retrieve expected entry by tag.');
}