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Test cases for a vending machine

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Hi,
I need assistance in the following problem please.

Derive test cases from the following informal specifications for a simple vending machine:

Program CoinBox accepts quarters and distributes coffee.

Users may:
- insert a quarter
- ask for a cup of coffee
- ask for quarters to be returned
Coffee costs 2 quarters.

The test cases should cover each transition of the finite state machine at least once.

Best Regards,

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