Depends. Is it a lab test or a home kit? If its a home kit or an on-the-spot tester than eat salty dinner the night before and salty breakfast the day of. Drink TONS of water, literally as much as you can stomach, T-minus 5 hours prior to the test, take a caffeine pill 2 hours before test, and you will pass. I've done this COUNTLESS times and always, always it works. Always.
Why, might you ask? Salt retains water so it will keep the THC locked in your kidneys, then the caffeine will increase your metabolism making you pass liquids faster, and the hyper-water intake will make it, combined so literally you are pissing nearly drinkable water. Don't drink coffee or orange juice the morning of, it will only burn lipids into your urine. Only if its a lab test are you screwed, but since you smoked SATURDAY and the test is TUESDAY if you arent a daily smoker than you are fine without even having to worry. If its a 1-time smoke it stays in your system for, at the very longest, 1-2 days tops.
Don't worry my friend you will pass. Happy trails.