System testing represents an integration test of:

Question

BlackTom AI · Accepted Answer

System testing is performed on the complete, integrated software system to verify that it meets its functional and non‑functional requirements.

1) Relevant knowledge points and concepts
- Test levels: unit testing (methods/classes), integration testing (components/modules), system testing (entire integrated system), acceptance testing (system validated against user needs).
- Purpose of system testing: validate end‑to‑end behavior, interfaces between subsystems, overall performance, reliability, security and compliance with requirements.
- “Integration test of” here means which scope is being integrated and tested as a whole.

2) Step‑by‑step reasoning
- Unit tests exercise a single method or class in isolation. So “an entire method” and “an entire class” correspond to unit testing scope.
- Integration testing typically combines a few modules or components to check their interactions; testing “multiple unrelated classes” would be a component or integration test at a smaller scope than system testing.
- System testing takes all modules, components, and external interfaces that make up the application, integrates them into a complete product, and tests that complete product in an environment that simulates production.
- Therefore, when the question asks which scope system testing represents an integration test of, the correct interpretation is the integration of all parts into a single software system.

3) Calculations / intermediate steps
- Not applicable (conceptual reasoning only).

4) Why the correct answer is correct
- System testing validates the entire integrated software system as one entity, exercising end‑to‑end scenarios and verifying that the system as a whole satisfies the specified requirements. This aligns exactly with “an entire software system.”

5) Why other options are incorrect
- “Multiple unrelated classes”: describes low‑level component/integration testing, not the full system.
- “An entire class”: unit testing scope.
- “An entire method”: unit testing at the smallest scope.
All three are narrower than system testing.

6) Conclusion
System testing corresponds to an integration test of an entire software system. This confirms the provided answer: an entire software system.

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