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Module 4: Software Testing

20237m

What are drivers and stub modules in context of integration and unit testing of software product? Why are stubs and driver modules required?

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Drivers and Stub Modules

Context: Integration & Unit Testing

  • Stub: Dummy called module (subordinate). Replaces not-yet-built lower modules in Top-down integration. Simulates return values.

    • Ex: Main → Stub pay() returns dummy "success"

  • Driver: Dummy calling module (superior). Replaces not-yet-built upper modules in Bottom-up integration. Calls unit under test.

    • Ex: Driver test_harness() calls calculateSalary()

Why Required?

  • Modules developed independently / incrementally; not all available at test time
  • Need to isolate unit, simulate interface without building whole system
  • Reduce dependency, enable early testing

Top-down needs stubs, Bottom-up needs drivers, Sandwich needs both.

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