You have a vending machine with states: Idle, HasMoney, and Dispensing. Events are InsertCoin, SelectItem, and DispenseItem. Which test case best checks the transition from HasMoney to Dispensing?

hard📝 Application Q15 of 15

Testing Fundamentals - Functional Testing Techniques

You have a vending machine with states: Idle, HasMoney, and Dispensing. Events are InsertCoin, SelectItem, and DispenseItem. Which test case best checks the transition from HasMoney to Dispensing?

AStart in Idle, SelectItem, then InsertCoin

BStart in Dispensing, InsertCoin, then SelectItem

CStart in Idle, InsertCoin, then SelectItem

DStart in HasMoney, DispenseItem, then InsertCoin

Step-by-Step Solution

Solution:

Step 1: Identify the transition from HasMoney to Dispensing
The event that moves the machine from HasMoney to Dispensing is SelectItem.
Step 2: Find the test case that triggers this transition
Start in Idle, InsertCoin, then SelectItem starts Idle, InsertCoin (moves to HasMoney), then SelectItem (moves to Dispensing), correctly testing the transition.
Final Answer:
Start in Idle, InsertCoin, then SelectItem -> Option C
Quick Check:
HasMoney + SelectItem = Dispensing [OK]

Quick Trick: Trace events to reach target transition [OK]

Common Mistakes:

Starting in wrong state
Using events in wrong order
Ignoring correct event for transition

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You have a vending machine with states: Idle, HasMoney, and Dispensing. Events are InsertCoin, SelectItem, and DispenseItem. Which test case best checks the transition from HasMoney to Dispensing?

Step 1: Identify the transition from HasMoney to Dispensing

Step 2: Find the test case that triggers this transition

Final Answer:

Quick Check:

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