ISTQB Black-Box Test Design 2

Question 1

Which black-box technique is most appropriate when testing a field that accepts values from 1 to 100, where behavior changes only at the boundaries?

Accepted Answer

Boundary value analysis

Answer

Boundary value analysis targets the values at and just outside the limits (0, 1, 100, 101) where defects are most likely.

Question 2

In equivalence partitioning, what is the minimum number of test cases typically needed to cover a valid partition?

Accepted Answer

One representative test case per partition

Answer

EP assumes all values in a partition behave identically, so one representative value per partition is sufficient.

Question 3

A login system locks an account after 3 failed attempts and unlocks it after a successful admin reset. Which technique BEST models this behavior?

Accepted Answer

State transition testing

Answer

State transition testing models systems where outputs depend on current state and input, such as account locking workflows.

Question 4

A decision table has 3 conditions, each with 2 possible values. How many rule columns does a full decision table have?

Accepted Answer

8

Answer

A full decision table has 2^n columns where n is the number of binary conditions, so 2^3 = 8.

Question 5

Which black-box technique focuses on the interactions between actors and the system to achieve a specific goal?

Accepted Answer

Use case testing

Answer

Use case testing derives tests from use cases that describe goal-oriented interactions between actors and the system.

ISTQB - International Software Testing Qualifications Board Practice Test