Artifact: Testability Class   A specialized Class in the design model that represents test-specific behavior that the software will support. Other Relationships:  Part Of Design Model Role:  Designer  Optionality/Occurrence:  This artifact is only used if you are designing and implementing test-specific functionality.  Templates and Reports:    Examples:    UML Representation:  Class, stereotyped as <<testability class>>  More Information:  Guideline: Design Class   Purpose Properties Timing Responsibility Tailoring Input to Activities:  Design Testability Elements Implement Testability Elements   Output from Activities:  Design Testability Elements     Purpose The purpose of the Testability Class is to capture the design for the test-specific functionality required to facilitate testing. This test-specific functionality should be incorporated in the software design model so that it can be factored into the complete software design. There are various types of test-specific behavior, two of which are: "Stubs" for design classes that you need to simulate or that you have decided not to include completed versions of in software that will be used as a test target. Specialized interfaces or output, that provide the visibility or control necessary to conduct testing.   Properties See Properties in Artifact: Design Class.   Timing Testability Class artifacts are created and modified in parallel with creating and modifying the corresponding design classes.   Responsibility The Designer is responsible for this artifact. For additional details, see Responsibility in Artifact: Design Class. The Implementer role uses the testability classes to guide the implementation of the test-specific behavior.   Tailoring See Tailoring in Artifact: Design Class. © Copyright IBM Corp. 1987, 2004. All Rights Reserved.

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