This figure $($ch$.8)$ illustrates the idea of component interface testing. Assume that components A$,$ B$,$ and C have been integrated to create a larger component or subsystem. The test cases are not applied to the individual components but rather to the interface of the composite component created by combining these components. Interface errors in the composite component may not be detectable by testing the individual objects because these errors result from interactions between the objects in the component.

Develop an example of interface testing. Provide all the necessary components $($see image above$)$ and provide a brief summary of what your interface testing means.