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Deriving Test Cases from Partitions

publish date: 2026/06/17 05:49:39.787878 UTC

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For the specification accepting 4 to 8 inputs of 5-digit integers greater than 10,000, which set of test inputs best represents good partition testing practice, including boundary values?

3 inputs of 9,999 - 6 inputs of 50,000 - 9 inputs of 99,999

3 inputs of 9,999, 4 inputs of 10,000, 7 inputs of 50,000, 8 inputs of 99,999, 9 inputs of 100,000

Exactly 5 inputs of 50,000 repeated 3 times with identical values

Only: 6 inputs of value 50,000 (one test from the middle of both valid partitions)

Correct Answer

3 inputs of 9,999, 4 inputs of 10,000, 7 inputs of 50,000, 8 inputs of 99,999, 9 inputs of 100,000

Explanation

Good partition testing combines boundary values (3 inputs=below minimum, 4 inputs=minimum, 8 inputs=maximum, 9 inputs=above maximum) with mid-partition values (7 inputs in the middle of the valid count range; 9,999 at the boundary of the invalid value range, 10,000 at valid boundary, 50,000 near the midpoint, 99,999 at valid upper boundary, 100,000 at the invalid boundary).

Reference

Software Engineering, Ian Sommerville, 10th edition

Quizzes you can take where this question appears

Choosing Unit Test Cases - Partition Testing