Added tests to check for exceptions.
Added tests to check for exceptions.

lkalinka/concurrent-spider-bundle,keesschepers/concurrent-spider-bundle,Breuls/concurrent-spider-bundle,keesschepers/concurrent-spider-bundle,Breuls/concurrent-spider-bundle,lkalinka/concurrent-spider-bundle,lkalinka/concurrent-spider-bundle,Breuls/concurrent-spider-bundle,keesschepers/concurrent-spider-bundle