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What System Testing Should Focus On

publish date: 2026/06/18 05:28:22.378317 UTC

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System testing should focus primarily on which of the following?

Measuring the lines of code covered by all unit tests combined

Testing the interactions between the components and objects that make up a system

Verifying that each component was built using the correct design patterns

Re-running all unit tests to confirm they still pass with the integrated codebase

Correct Answer

Testing the interactions between the components and objects that make up a system

Explanation

System testing should focus on testing the interactions between the components and objects that make up the system. Individual unit tests check component behavior; system testing checks that components interact correctly and that emergent system behavior is as expected. Interaction testing helps discover bugs that are only revealed when a component is used by other components.

Reference

Software Engineering, Ian Sommerville, 10th edition

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System Testing