CISSP Question #433: Real Exam Question with Answer & Explanation

Question

Which of the following is TRUE regarding equivalence class testing?

Options

• AIt is characterized by the stateless behavior of a process implemented In a function.
• BAn entire partition can be covered by considering only one representative value from that
• CTest inputs are obtained from the derived boundaries of the given functional specifications.
• DIt is useful for testing communications protocols and graphical user interfaces.

Explanation

Equivalence class testing (also called equivalence partitioning) divides input data into partitions where all values are expected to behave the same way, allowing a single representative value to stand in for the entire partition.

Common mistakes.

• A. Stateless behavior of a process implemented in a function describes a characteristic relevant to functional or unit testing concepts, not the defining principle of equivalence class testing.
• C. Deriving test inputs from boundaries of functional specifications describes boundary value analysis (BVA), which is a related but distinct black-box testing technique that focuses on edge values rather than representative middle values of partitions.
• D. Testing communications protocols and graphical user interfaces is characteristic of state transition testing (also called finite state machine testing), which models behavior based on states and transitions, not equivalence partitioning.

Concept tested. Equivalence partitioning representative value selection principle

Reference. https://www.istqb.org/downloads/send/51-ctfl2018/208-ctfl-2018-syllabus.html

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