$status = $this->backend->lockFiles( $paths, LockManager::LOCK_EX );
$this->assertEquals( print_r( [], true ), print_r( $status->getErrors(), true ),
"Locking of files succeeded ($backendName) ($i)." );
$status = $this->backend->lockFiles( $paths, LockManager::LOCK_EX );
$this->assertEquals( print_r( [], true ), print_r( $status->getErrors(), true ),
"Locking of files succeeded ($backendName) ($i)." );