White-Box
Updated 2026-08-13
INTRODUCTION
English translation pending.
CORE DEFINITION
White-box testing designs test cases with visibility into the implementation, targeting branches, paths, and conditions rather than treating the system as opaque. Its complement is black-box testing, which derives cases from requirements and observable behavior alone. The qualification is that path coverage does not imply correctness: code can be fully exercised and still fail the requirement, so coverage measures testing effort rather than product quality. Its strength is locating the specific logic that produces a failure.
SCAFFOLDING EFFECT
Reduce cognitive load
- Coverage targeting: choose test cases that exercise the branches and paths not yet executed. - Failure localization: use internal visibility to trace exactly which logic produced an observed failure. - Coverage audit: identify the paths no test currently reaches and judge whether that matters.
Anchor fast decisions
Because the tester can see the implementation, test cases can be selected to reach specific decision branches, which makes uncovered logic directly identifiable. That visibility converts testing from sampling behavior into systematic exploration of the code, so defects concentrated in rare branches become reachable rather than remaining hidden behind the paths normal usage happens to take.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/White-box_testingverified
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