Question

What is the difference between All-DU-Paths coverage and All-Uses coverage in dataflow analysis?

a.

All-DU-Paths coverage requires definition-clear paths to be cycle-free or a simple cycle, while All-Uses coverage does not

b.

All-Uses coverage requires definition-clear paths to be cycle-free or a simple cycle, while All-DU-Paths coverage does not

c.

All-Uses coverage requires each use of a definition to be tested, while All-DU-Paths coverage requires each definition-clear path to be exercised

d.

All-DU-Paths coverage requires each use of a definition to be tested, while All-Uses coverage requires each definition-clear path to be exercised

Posted under Software Testing Software Engineering

Answer: (a).All-DU-Paths coverage requires definition-clear paths to be cycle-free or a simple cycle, while All-Uses coverage does not Explanation:A possible test strategy is to construct tests which traverse a definition-clear path between each definition of a variable to each (P- or C-) use of that definition and each successor of that use. This strategy is known as All-Uses coverage. A slightly stronger criterion requires that each definition-clear path is either cycle-free or a simple cycle. This is known as All-DU-Paths coverage. This means that All-Uses coverage requires each definition of a variable to be tested, while All-DU-Paths coverage requires each definition-clear path to be either cycle-free or a simple cycle.

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