The problem described involves a software implementation error in a decision statement for calculating a bonus based on the Total Amount of Sales (TAS). The requirement states that if TAS is 300,000 or more, a bonus should be paid. However, the software incorrectly implements this with "IF (TAS = 300000)" instead of "IF (TAS >= 300000)".
Applying Boundary Value Analysis (BVA) to this situation involves selecting test cases at the boundaries of the input domain, including just below, at, and just above the boundary conditions.
* Test Case TC1 = 299999:
* This value is just below the boundary (300,000).
* Expected Result: No bonus should be paid.
* Actual Result: No bonus paid.
* TC1does not highlight the fault because the implemented condition "IF (TAS = 300000)" and the correct condition "IF (TAS >= 300000)" both yield the same result (no bonus).
* Test Case TC2 = 300000:
* This value is exactly at the boundary.
* Expected Result: Bonus should be paid.
* Actual Result: Bonus paid.
* TC2does not highlight the fault because the implemented condition "IF (TAS = 300000)" and the correct condition "IF (TAS >= 300000)" both yield the same result (bonus paid).
* Test Case TC3 = 300001:
* This value is just above the boundary.
* Expected Result: Bonus should be paid.
* Actual Result: No bonus paid due to the incorrect implementation.
* TC3highlights the fault because the implemented condition "IF (TAS = 300000)" fails to pay the bonus, whereas the correct condition "IF (TAS >= 300000)" would pay the bonus.
* BVA focuses on the edges of input ranges where errors are more likely.
* The critical values are just below, at, and just above the boundary.
Boundary Value Analysis (BVA):Verification:According to the ISTQB CTFL syllabus, BVA is an essential technique for identifying potential errors at the boundaries of input ranges. This is because developers are more likely to make mistakes at these extremes.
Therefore,TC3 (300001)is the test case that would highlight the fault in the software's implementation of the decision condition.