Fix test: a class listener should be only run once
Fix test: a class listener should be only run once

AJ-72/testng,cbeust/testng,gjuillot/testng,cbeust/testng,AJ-72/testng,AJ-72/testng,AJ-72/testng,akozlova/testng,AJ-72/testng,emopers/testng,cbeust/testng,emopers/testng,gjuillot/testng,akozlova/testng,gjuillot/testng,akozlova/testng,emopers/testng,akozlova/testng,krmahadevan/testng,krmahadevan/testng,krmahadevan/testng,AJ-72/testng,cbeust/testng,gjuillot/testng,missedone/testng,emopers/testng,emopers/testng,missedone/testng,cbeust/testng,gjuillot/testng,krmahadevan/testng,krmahadevan/testng,missedone/testng,missedone/testng,missedone/testng,akozlova/testng