Deutsche Bank AG and Barclays Plc's rebound in fixed-income revenue during the second quarter will test their leaders' pledges to scale back in that business. Europe's largest investment bank posted a 16 percent increase in revenue from trading debt and currencies, surpassing analyst estimates. Barclays said income from its rates and currency businesses jumped 10 percent as the political turmoil in Greece boosted volatility. BNP Paribas SA, France's largest bank, said Friday that fixed-income sales rose 4 percent driven by currencies and commodities.