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Consider the following section of pseudo code and associated test Input data:
If withdrawal-amount <= amount-on-deposit then Set authorize-transaction = true
Else
If withdrawal-amount <= S100 AND preferred-customer = true then Set authorize-transaction = true
Else
Set authorize-transaction = false
Endif
Endif
Input data set #1
withdrawal-amount = 160
amount-on-deposit = 100
preferred-customer = true
Input data set #2
withdrawal-amount = 500
amount-on-deposit = 500
preferred-customer = false
Input data set #3
withdrawal-amount = 50
amount-on-deposit = 500
preferred-customer = false
What would be the decision coverage achieved if each of these test input data sets were run once?
To achieve decision coverage, each branch of the decision structure in the code must be executed at least once. The code snippet has three branches:
withdrawal-amount <= amount-on-deposit
withdrawal-amount <= $100 AND preferred-customer = true
Default case where the transaction is not authorized
Data set #1 triggers the second branch because the withdrawal amount is not less than the amount on deposit, but it is less than $100, and the user is a preferred customer.
Data set #2 triggers the first branch where the withdrawal amount is equal to the amount on deposit.
Data set #3 tests the condition where the withdrawal amount is less than the deposit amount, but the user is not a preferred customer, triggering the default case.
All decision branches are covered by these test cases, achieving 100% decision coverage.