Use Case testing

-

 What is a Use case?

- A use case is a list of steps to achieve a goal in the system.

- These steps define the interaction between Actor and the System.

- The use case outlines the main scenarios and the optional exceptional scenarios.


Example:

Use Case name: Cash Withdrawl

Description: This use case describes how the Customer uses ATM system to withdraw cash from his/her bank account.

Pre-condition: 

1. ATM system is online

2. Sufficient balance is available

Normal Workflow:

1

The Customer will insert the debit card

2

The System will prompt for a PIN

3

The Customer will enter valid PIN

4

The System will display the option to "Withdraw Cash"

5

The Customer will select the option to withdraw

6

The System will prompt for an amount

7

The Customer will enter an amount

8

The System will submit the amount to Bank for approval

9

The Bank will confirm the transaction

10

The System will dispense cash

11

The System will return the card.

12

The use case ends with a success


Alternate workflows:

4a. If PIN is Invalid,

1

System will return the card

2

The use case ends with a failure


8a. If the Amount is invalid,

1

The System will display and error message and prompt for another amount.

2

The use case resumes at Step 7


10a. If the bank declines the transaction,

1

The System returns the card

2

The use case ends with a failure

3a, 5a, 7a If Customer selects the option to "Cancel"

1

The Sytem will return the card

2

The use case ends.

Additional Bussiness rules: The System will dispense only 100$ maximum in a Single transaction.

Post-condition: The Customer will receive their cash amount


Design Test cases for above use case:


TEST CASE(S)

STEPS

EXPECTED RESULTS

Test Case 01: Cash Withdrawl1 – Normal Workflow

1

Insert Debit card

System will prompt to enter PIN

2

Enter valid PIN

The System will display option to "Withdraw Cash"

3

Select the option to "Withdraw Cash"

The System will prompt for an amount.

4

Ènter valid amount as 100$

The System will dispense the cash. The System will return the card

Test Case 02:Cash Withdrawl2 – Invalid PIN

1

Repeat step 1 of Cash Withdrawl1


2

Enter an invalid PIN

The System will return the card.

Test Case 03: Cash Withdrawl3 – Invalid Amount

1

Repeat step 1 through 4 of Cash Withdrawl1 with invalid amount ($101)

The System will display an error message and prompt for another amount.

2

Repeat step 4 of Cash Withdrawl1 with invalid amount ($0)

The System will display an error message and prompt for another amount.

3

Repeat step 4 of Cash Withdrawl1 with valid amount ($1)

The System will dispense cash and return the card.

Test Case 04: Cash Withdrawl 4 - Bank declines transaction

1

Repear steps 1 to 4 of Cashwithdrawl1 with amount > account balance.

The System will return the card.

Test Case 05: Cash Withdrawl 5 – Cancel transaction.

1

Repeat Step 1 of Cash Withdrawl1


2

Select the option to "Cancel"

The System will return the card

3

Repeat steps 1 and 2 of Cash Withdrawl1


4

Select the option to "Cancel"

The System will return the card

5

Repeat steps 1 to 3 of Cash Withdrawl1


6

Select the option to "Cancel"

The System will return the card

This is how we design test cases using use cases.



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