ISTQB Certified Tester Foundation Level v4.0 — Question 24

A functional requirement states that pressure values must always be positive and stay within a range of 100 to 200 pounds for a particular tank (100 and 200 are valid within the range).
Which of the following is the minimum set of values that would achieve coverage using the equivalence partitioning technique?

Answer options

• A. A series of tests where pressure is set to 98, 110, and 201 pounds
• B. A series of tests where pressure is set to 98, 100, and 200 pounds
• C. A series of tests where pressure is set to 100, 110, and 200 pounds
• D. A series of tests where pressure is set to -1, 0, 175, and 297 pounds

Correct answer: A

Explanation

Option A is correct as it includes values that are outside the valid range (98 and 201), which allows for testing of both invalid and valid scenarios. Options B and C do not test values outside the specified range effectively, while option D includes negative and excessively high values that do not achieve the required range coverage.