Nearly one-third of Florida-based banks failed a “stress test” for an economic downturn by Trepp LLC, the South Florida Business Journal reports. The New York-based firm analyzed banks based on whether they could maintain the minimum capital ratios amid economic trouble. The federal Dodd-Frank financial reform requires many banks to plan for such downturns. Trepp’s test ran through 12 macroeconomic variables that would severely impact the economy. It tested 6,000 banks nationwide, including…