In a scenario where a system's components are tightly coupled, how would the approach to testing differ between API and unit testing?

In a scenario with tightly coupled components, API testing would specifically focus on the interaction between these components, ensuring that the communication and data flow between them are correct. Unit testing, on the other hand, would still focus on individual functions or units, but it may not cover the intricacies of tightly coupled components' interactions. Tight coupling can lead to unexpected issues, and API testing becomes crucial in such situations to validate the behavior of the integrated components.