Question

Decision table testing is being performed on a speeding fine system. Two test cases have already been generated for rules R1 and R4, which are shown below:

Rules R1 R4
Conditions Speed > 50 T F
School Zone T F
Actions $250 Fine F F
Driving license withdrawal T F
Given the following additional test cases:
Rules DT1 DT2 DT3 DT4
Input Speed 55 44 66 77
School Zone T T T F
Expected Result $250 Fine F F F T
Driving license withdrawal T F T F
Which two of the additional test cases would achieve full coverage of the complete decision table(when combined with the test cases that have already been generated for rules R1 and R4)?
A. DT1, DT2
B. DT2, DT3
C. DT2, DT4
D. DT3, DT4

Answer 1

To achieve full coverage in decision table testing for a speeding fine system, test cases DT2 and DT4 should be used in conjunction with the existing test cases R1 and R4. Option C is correct.

Step-by-step explanation:

The student's question revolves around decision table testing, which is used for a speeding fine system. The table includes two existing test cases for rules R1 and R4, and the student must identify which two additional test cases (DT1, DT2, DT3, or DT4) would provide full coverage combined with the existing ones.

We must check for all possible combinations of 'Speed' and 'School Zone' conditions. Since R1 handles the case when speed is over 50 in a school zone, and R4 handles the case when speed is not over 50 and not in a school zone, we need additional test cases that cover the remaining combinations for full coverage:

Speed > 50, not in a school zone

Speed <= 50, in a school zone

Looking at the provided additional test cases:

DT1: Speed 55 in a school zone (already covered by R1)

DT2: Speed 44 in a school zone (needed for full coverage)

DT3: Speed 66 in a school zone (already covered by R1)

DT4: Speed 77, not in a school zone (needed for full coverage)

Therefore, test cases DT2 and DT4 should be selected to achieve full coverage when combined with R1 and R4.