Which of the following are facts about a top-down software testing approach ? I. Top-down testing typically requires the tester to build method stubs. II. Top-down testing typically requires the tester to build test drivers.
only I
Incremental integration testing can proceed top-down (starting from the main control module) or bottom-up (starting from the lowest-level modules). The two approaches need different kinds of scaffolding code.
I. In top-down testing the high-level modules are tested first, while the modules they call are not yet integrated. Those lower modules are replaced by stubs, dummy methods that return fixed values. The statement is true.
II. Test drivers are programs that call a module under test and pass it inputs; they are needed in bottom-up testing, where the low-level modules are tested before the modules that would normally call them exist. In top-down testing the real upper modules already act as the callers, so drivers are not typically required. The statement is false.
Only statement I is a fact about the top-down approach; the choices including II describe bottom-up testing.
only I option is correct.
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