Juergen Klopp believes Borussia Dortmund passed an important test on Saturday, coming from behind to beat Mainz 2-1 in the Bundesliga.
Klopp's former side took an early lead through Marco Caligiuri, but goals from Marco Reus and Robert Lewandowski ensured the visitors made it four straight wins in all competitions.GOAL.COM - Global football news, transfer rumours and betting editorial
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