15.3. System Tests
A unit test verifies a particular outcome from a single activity. System tests, on the other hand, verify the proper execution of a use case that may involve multiple system interactions by multiple actors. Figure 15.9 shows all the activities in the Order Merchandise use case.
Figure 15.9. Activity Diagram for the Use Case Order Merchandise
System tests share many of the same characteristics of unit tests: Both begin by establishing the state of the system based on preconditions, both have execution traces started by an initial signal, and both terminate with results that can be verified against postconditions.
The principal ...
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