CareerCup

Here are a few aspects to test it. You could come up with tons of tests with time.

1. Test with insufficient money
a. You should not be able to buy anything
2. Test with more money that needed
a. Try buying some random items (or all)
b. Use all dollar bills and coins
c. Use only coins
d. Use only dollar bills
3. Test with exact money
a. Do all steps mentioned in 2
4. Enter money and cancel. Verify you get all money back.
5. Order an item that no longer is available

Physical (Stress)
a. Press button hard, soft
b. Press button incessantly after paying/before paying
c. Try pushing the machine down
d. Place heavy/light items inside the machine (if you have access)

any solutions?

niceeeeeeeeeeeeeeee

Some more tests
1. Repeat the purchase tests for all the items. Make sure that all items are purchasable.
2. Try to buy more than one item before the chnage return if this function is supported.
3. Try insert some white paper whose shape is same as a dollar bill with some text written on the paper
4. Try to insert some coin shape objects and see what will happen.

Another case could be, try to enter a paper in the machine (will it accept as a dollar?), same for coins, try to enter a circle shaped metal (will it accept as a cent?)