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Software Testing

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# Software Testing - PowerPoint PPT Presentation

Software Testing. Functional, MCC, Dataflow Testing, Cause-Effect Graphing. Solution. 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

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### Software Testing

Functional, MCC, Dataflow Testing,

Cause-Effect Graphing

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,