Designing the System Under Test (SUT) for testability is important for a good test automation approach and can also benefit manual test execution. Which of the following is NOT a consideration when…

Question

Options

• AObservability: The SUT needs to provide interface that give insight into the system.
• BRe-useability: The code written for the SUT must be re-useable for other similar system.
• CClearly defined architecture: The SUT Architecture needs to provide clear and understandable
• DControl: the SUT needs to provide interfaces that can be used to perform actions on SUT.

• A
  97% (28)
• C
  3% (1)

Explanation

There appears to be an error in the provided answer key. Based on established testing principles (including ISTQB), the correct answer should be B (Re-useability), not A.

Why B is the correct "NOT a consideration": Re-useability is a general software quality attribute - it concerns whether code can be repurposed across systems - but it has no direct bearing on whether a system is testable. Designing for testability does not require that the SUT's code be reusable in other systems.

Why the distractors are actually valid testability considerations:

• A (Observability) is a core testability pillar: testers need visibility into system state, outputs, and behavior to verify correctness. Without it, you cannot determine if the SUT is behaving correctly.
• C (Clearly defined architecture) enables testers and automation tools to isolate components, understand boundaries, and target specific areas - making tests more precise and maintainable.
• D (Control) is equally fundamental: testers need interfaces to set preconditions, trigger actions, and drive the system into specific states during testing.

Memory tip: Use the acronym OCA-C (Observability, Clear architecture, and Control) to recall the real testability trio. Re-useability sounds like good engineering practice - and it is - but it belongs in a design quality checklist, not a testability checklist. If a choice sounds like general code quality rather than test-specific need, it's likely the odd one out.

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