Object Interactions
An object interaction is simply a request by one object (the sender) to another (the receiver) to perform one of the receiver's operations and all of the processing performed by the receiver to complete the request.[1] In most object-oriented languages, this covers the vast majority of activity in a program. It includes messages between an object and its components and between an object and other objects with which it is associated. We assume these other objects are instances of classes that have already been tested in isolation to the extent that the class's implementation is complete.
[1] We assume a class interface is defined solely using operations and not data. If data is accessible by collaborators, then approach the ...
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