You are using boundary value analysis to determine your test data. What values should you use to test a routine that requires an integer input (x) to be greater than zero and less than 100 to…

Question

Options

• A0, 100
• B-1, 1, 99, 101
• C0, 1, 99, 100
• D-1, 0, 1, 99, 100, 101

• A
  4% (1)
• B
  73% (19)
• C
  8% (2)
• D
  15% (4)

Explanation

Option B (-1, 1, 99, 101) is correct because two-point boundary value analysis tests one value just outside (invalid) and one value just inside (valid) each boundary. Since the condition is x > 0 and x < 100, the lower boundary sits at 0 and the upper at 100 - making 1 the first valid value and -1 invalid on the low side, and 99 the last valid value and 101 invalid on the high side.

Why the distractors fail:

• A (0, 100) tests the exact boundary points themselves, not values on either side - this misunderstands what BVA is probing.
• C (0, 1, 99, 100) includes the actual boundaries (0 and 100) alongside the nearest valid values, which blends approaches but doesn't correctly apply two-point BVA.
• D (-1, 0, 1, 99, 100, 101) is the correct answer for three-point BVA (below, at, and above each boundary) - a common trap answer on this topic.

Memory tip: Think of two-point BVA as "fail then pass" at each fence - you test the value that just misses the condition and the value that just meets it, so you have exactly two points per boundary.

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