Which testing level specifically checks the interfaces between components?

Which testing level specifically checks the interfaces between components?

• A. Unit testing
• B. Integration testing
• C. System testing
• D. Acceptance testing

Answer: (B)

Integration testing centers on validating the interfaces between components and how they work together. After each component has been tested in isolation, integration testing combines them to make sure data passes correctly, methods are invoked in the right sequence, and API contracts are honored. It looks for issues like mismatched data formats, incorrect parameter handling, or errors that don’t propagate as expected when one module interacts with another. This testing level often uses incremental approaches, such as building up from smaller components or driving higher-level components to exercise their dependencies, to uncover interface problems early. Other testing levels focus on different concerns: unit testing checks the internal correctness of a single component in isolation; system testing evaluates the behavior of the entire system in a realistic environment; acceptance testing verifies that the solution meets user requirements and business goals.

Integration testing centers on validating the interfaces between components and how they work together. After each component has been tested in isolation, integration testing combines them to make sure data passes correctly, methods are invoked in the right sequence, and API contracts are honored. It looks for issues like mismatched data formats, incorrect parameter handling, or errors that don’t propagate as expected when one module interacts with another. This testing level often uses incremental approaches, such as building up from smaller components or driving higher-level components to exercise their dependencies, to uncover interface problems early.

Other testing levels focus on different concerns: unit testing checks the internal correctness of a single component in isolation; system testing evaluates the behavior of the entire system in a realistic environment; acceptance testing verifies that the solution meets user requirements and business goals.