ITPEC FE Subject A April 2025 Question 38
Which of the following is an appropriate test to ensure that the interfaces and linkages between different parts of software work properly?
Explanation
Integration test — it checks that modules which work on their own also work together through their interfaces.
After unit testing, modules are combined step by step (top-down with stubs, bottom-up with drivers, or all at once) and tested on the interfaces between them: the parameters passed, the data exchanged and the order of calls. Integration testing targets exactly these linkages.
Answer (b)
Why not others:
- •(a) Functional test — checks the system's functions against the requirements from the user's point of view, regardless of internal module boundaries
- •(c) Performance test — measures response time, throughput and behaviour under load, not whether interfaces are correct
- •(d) Unit test — tests one module in isolation, replacing its neighbours with stubs or drivers, so the real interfaces are not exercised
Key rule: Test levels widen in scope: unit (one module), integration (interfaces between modules), system (the whole against the requirements), acceptance (by the user).
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