Which testing type examines all interactions between components?

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

Answer: (B)

The concept here is how different parts of a system work together. Integration testing is the type that verifies all interactions between components, ensuring they connect correctly, exchange data as expected, and behave properly when wired together. In a MuleSoft context, this means checking that multiple flows and their processors, endpoints, and data transformations collaborate correctly—that messages flow through the system, are transformed properly, and error handling travels from one component to the next as designed.

Unit testing, by contrast, looks at an individual component in isolation; performance testing focuses on how the system performs under load; and acceptance testing checks that the overall solution meets business requirements.