Testing Levels

Updated 06 Sep 2026

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def
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  the stages of testing within the Software Development Life Cycle (SDLC) that find missing areas and avoid overlapping or repetition between development phases
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levels (from small to large)
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  Unit Testing — tests individual components in isolation
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  Integration Testing — tests how components work together
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  System Testing — tests the system as a whole
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  Acceptance Testing — tests that the system meets customer requirements
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relationship to the V-model (plan-driven testing)
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  unit testing <-> component design
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  integration testing <-> system design
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  system testing <-> requirements specification
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  acceptance testing <-> user requirements
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related
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Cards
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  What is the typical order of testing levels?
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    Unit -> Integration -> System -> Acceptance

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