ISTQB Black-Box Test Design 4

Question 1

A password field requires 8 to 16 characters. Using 3-value BVA, which set of test values is complete?

Accepted Answer

7, 8, 9, 15, 16, 17

Answer

3-value BVA tests the value below, at, and above each boundary: 7, 8, 9 for the lower boundary and 15, 16, 17 for the upper boundary.

Question 2

Which statement about invalid equivalence partitions is CORRECT?

Accepted Answer

Each invalid partition should be covered by a separate test case

Answer

Each invalid partition should have its own test case to avoid masking errors, as multiple invalid inputs in one test may hide failures.

Question 3

In a state machine with 4 states and 6 transitions, what is the minimum number of tests needed for transition coverage (0-switch)?

Accepted Answer

6

Answer

0-switch coverage requires exercising each transition at least once, so the minimum is equal to the number of transitions (6).

Question 4

A use case has 3 alternative flows in addition to the basic flow. How many test scenarios are minimally required to achieve basic use case coverage?

Accepted Answer

4

Answer

Basic use case coverage requires at least one test for the basic flow plus one for each alternative flow, totaling 4 scenarios.

Question 5

Which of the following is NOT a black-box test design technique according to ISTQB?

Accepted Answer

Statement coverage testing

Answer

Statement coverage is a white-box (structural) technique; the others are black-box techniques based on specifications.

ISTQB - International Software Testing Qualifications Board Practice Test