Software Testing & Maintenance - Midterm

What is a fault?

static defect in code

What is an error?

wrong internal state caused by a fault

What is a failure?

wrong external state, intended output ≠ actual output

How to NOT execute a fault?

make intended output = actual output even though code is not correct

How to execute fault, NOT error?

make intended output = actual output using wrong formulaH

How to execute error, NOT fault?

• incorrect state not used

• fault corrected before being used for output

  • fault sets a wrong value but it’s not used

Program State

• input

• expected output

• actual output

• first error state

  • all variables and their values

  • program counter

Partition

block of members that all behave the same way

Disjointness property

blocks must NOT overlap

Completeness property

blocks must cover the entire domain

Pairwise Testing

come up with every possible combination of those two parameters

Combination formula

values^params

IPO (In Parameter Order) Strategy

generate pairwise test for first 2 parameters, then pairwise test for first 3 parameters, and so on