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## PowerPoint Slideshow about 'Software Testing' - studs

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Multiple Condition Coverage

- For each decision
- test case for true and test case for false
- same as C1
- For each complex (involves logical operators) decision
- test case for each combination of T/F for each relational operator
- A || B requires TT, TF, FT, FF
- Lazy evaluation => TX, FT, FF

TTYP Task – MCC

- Generate the test sets to achieve multiple condition coverage for the “if a>=b+c || b>=a+c || c>=a+b” decision in the triangle problem

Data flow coverage

- Def x is a node where x is defined (given a value)
- Use x is a node where the value of x is used in an expression or a decision
- C use is in a computation
- P use is in a decision (predicate)
- A def-free path is a path from a definition to a use that does not include another definition of that variable.

dcu - from every def to a c-use

- c-use (computation)
- if a variable is defined in node A and there are computational uses in node B and D, the dcu coverages requires an def-free path segment of either ABC or ACD

dpu - from every def to a p-use

- p-use (predicate)
- if a variable is defined in node A and it is used in a decision in C, the dpu coverage requires two def-free paths, one with segment of A...CD and one with A...CE

du - from every def to every use

- if a variable is defined in node A and there are computational uses in node B and D, the du coverage requires a def-free path from node A to node B and a def-free path from node A to node D

TTYP task

- Generate test case sets for triangle problem
- dpu
- dcu
- du

Cause-Effect Graphing

- Identify the basic conditions: b1, b2 (aka causes, atomic conditions)
- Identify the effects as boolean expressions of the conditions
- Identify combinations of the boolean expressions

Classic Example - boiler

- Boiler should shut down if
- Water level is below 20,000 lb
- Water level is above 120,000 lb
- Degraded mode and steam meter fails (Degraded mode if water pump has failed or pump monitor has failed)

Conditions for boiler

- B1 – water below 20,000 lbs
- B2 – water above 120,000 lbs
- B3 – water pump has failed
- B4 – pump monitor has failed
- B5 – steam meter has failed
- E1 – shut the boiler
- E1 = (B1 or B2 or (B5 (B3 or B4))

Tuesday, Apr 11

- OO testing
- Pressman 372-375,410-423
- SOS ch 13
- PreLecture quiz
- functional, mcc, data-flow,

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