What test can be done to see if ones heart is clean from jealousy?

Resprected Mufti i am a goal-setter and i reach 90% of my goals 90% of the time
My goal at the beginning of this Islamic year was to clean my heart of the slightest bit of jelousy and I feel I have done just that, but i require an acid-test to confirm what I feel have achieved. Please provide me with this acid-test and help me confirm so that in my diary I may add another goals has been achieved.
Shukran.