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Last modified on May 21, 2026
intermediate
Integration testing is a phase in software testing where individual software modules are combined and tested as a group. The purpose of integration testing is to identify interface defects among integrated components or systems. This testing can be performed using various approaches, including top-down, bottom-up, and sandwich (hybrid) methodologies. It focuses on the interactions between modules, ensuring that they work together as intended and that data is correctly passed between them.
Integration testing addresses issues such as mismatched interfaces, data format discrepancies, and communication failures between modules. For example, if a user authentication module does not properly communicate with a user profile module, integration testing can reveal this failure before the software is deployed.
Integration testing is used in software engineering to ensure that combined components function correctly together. It is typically conducted after unit testing and before system testing, allowing developers to catch issues early in the development cycle. This testing can be automated or performed manually, depending on the complexity of the integration and the tools available.
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