Chapter 6 – Test Tools
Driver – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A software component or test tool that replaces a component that takes care of the control and/or the calling of a component or system.
In simple words
Fake caller code that invokes the module under test when the real caller doesn't exist yet.
Exam tip
Drivers simulate the layer above; stubs simulate the layer below.
Related terms
- StubFake code you drop in for a not-yet-built dependency so your module can be tested.
- Test HarnessThe scaffolding around the code under test — the drivers that call it and the stubs that fake its dependencies.
- Integration TestingAfter units work alone, you plug them together and check the seams — API calls, data hand-offs, contracts.
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