Software Testing Company: Identification of Object Interactions
The interaction of objects is the process when one object (sender) requests another object (receiver) to perform one of the operations assigned to the receiver, and all kinds of data processing required to complete this request.
In situations where testing of object interaction is based only on public operations specifications, it is much easier to conduct than when the basis is the implementation itself. Let us confine ourselves to testing the public interface. Such an approach is justified, because it is believed that the classes have already successfully passed unit testing. Nevertheless, the choice of such an approach does not mean that we should not go back to class specifications in order to make sure that a particular method has fulfilled all the necessary calculations. This makes it necessary to check the attribute values for the internal state of the receiver, including any aggregated attributes, i.e. attributes that are objects themselves. The focus is made on the selection of tests based on the specifications for each operation performed by the public interface class.
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Object interactions are implicitly assumed in the class specification, in which there are references to other objects. Also, it is required to test primitive object types (primitive classes). These objects are the simplest components of the system and undoubtedly play an important role in the execution of any program. However, in object-oriented program, there is a relatively small number of primitive classes that realistically simulate task objects and all relationships between objects. It is common for well-designed object-oriented programs to use non-primitive classes; as usual, they play the key role in these programs.
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It is possible to identify such classes by using association relationships (including aggregation and composition relationships), presented in the class diagram. Such associations are converted into class interfaces, and one or another class interacts with other classes through one or several certain ways.
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