White Box Testing

Updated 06 Sep 2026

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def
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  a testing method that focuses on the internal structure, code, and logic of the product being tested
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  also known as: open box, glass box, transparent box, clear box, or code-based testing
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purpose
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  check code and internal structure
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  examine input-output processes with focus on internal workings
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what it looks for
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  broken or unoptimized code
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  security vulnerabilities
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  workflow and scenarios for specific input processes
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  conditional loop issues
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  object malfunction
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  wrong output
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steps
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  step 1 — study the source code; understand the application; check for secure coding practices
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  step 2 — create and execute test cases to spot weaknesses
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techniques
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  path testing
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  loop testing
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  condition testing
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  matrix graph testing
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  testing from the memory perspective
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graph matrices
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  a square matrix whose size equals the number of nodes on the flow graph
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  rows and columns correspond to identified nodes; entries correspond to edges
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  link weight provides additional control flow information (1 = connection exists, 0 = does not)
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who performs it
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  typically performed by developers
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related
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Cards
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  Distinguish white box testing from black box testing.
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    white box: tests internal logic/code structure, tester knows the implementation; black box: tests functionality via inputs/outputs only, tester doesn't need to know the code

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White Box Testing

Cards

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