What is the correct order of testing levels?

Question

BlackTom AI · Accepted Answer

Consider the standard progression in testing practices where we verify components from smallest to largest units. 
Option a: Unit → System → Integration places System testing before Integration testing, which contradicts the typical cascade where integrations are validated before they are tested at the system level. This ordering can overlook issues that arise when combining units before validating their collective behavior. 
Option b: Unit → Integration → System follows the conventional layered approach: first validate individual units in isolation, then test their interactions through integrations, and finally assess the complete system. This sequence aligns with how defects are often discovered and isolated earlier. 
Option c: System → Integration → Unit reverses the expected flow by starting with the whole system; problems at the unit level would be hard to pinpoint later, and the early focus on system behavior neglects unit-level correctness. This is not a practical or standard order for incremental verification. 
Option d: Integration → Unit → System starts with integrating components before confirming that each unit behaves correctly in isolation, which risks propagating faults from unnoticed unit-level issues into higher levels and makes debugging more complex. 
Overall, the option that matches the widely taught sequence of testing levels—from smallest to largest—is the one that goes Unit, then Integration, then System.

Systems Analysis and Design (082025-TVM)

What is the correct order of testing levels?

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