Data Flow Criteria

Question 1

Another testing perspective we can take is focusing on the way that _____ moves or flows

Answer 1

data

Question 2

In data flow testing, we test all the ways that a _____ may flow to it’s ______

Answer 2

Def (definition), uses

Question 3

What is a def-use pair?

Answer 3

The definition of some variable (x=…) and the eventual use (f(x))

Question 4

In def-use testing, we may be interested in the ____ used to get to the use case of the def

Answer 4

path

Question 5

When finding def-use pairs, be wary of _________

Answer 5

reassignments

Question 6

What are some possible testing criteria?

Answer 6

All defs coverage
All uses coverage
All def-use pairs coverage
All def-use paths coverage (many many tests)

Question 7

How do the def-use testing criteria compare to edge coverage?

Answer 7

Sometimes dont even have to test as much as edge coverage

Sometimes might cover more if you’re looking a how different definitions flow to different uses

Question 8

Where else might we see graphs when thinking about program design?

Answer 8

Call graphs
Inheritance
FSMs

Question 9

When should you use def-use testing?

Answer 9

If you have a context where this type of flow matters (OO programs with inheritance)