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Black box and White box examples

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Gurbakash Phonsa

The document discusses black-box and white-box testing techniques. For black-box testing, it describes equivalence class partitioning and boundary value analysis. For white-box testing, it covers statement coverage, branch coverage, path coverage, condition coverage, mutation testing, and data flow-based testing. It provides examples of how to apply equivalence class partitioning and test different types of code coverage.

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Black box and White box examples
Black-box Testing 0 Two main approaches to design black box test cases: 0 Equivalence class partitioning 0 Boundary value analysis Gurbakash Phonsa
Example In a computer store, the computer item can have a quantity between -500 to +500. Define equivalence classes for above scenario? Gurbakash Phonsa
Solution Valid class: -500 <= QTY <= +500 Invalid class: QTY > +500 Invalid class: QTY < -500 Gurbakash Phonsa
Example Account code can be 500 to 1000 or 0 to 499 or 2000 (the field type is integer). What are the equivalence classes? Gurbakash Phonsa
Solution Valid class: 0 <= account <= 499 Valid class: 500 <= account <= 1000 Valid class: 2000 <= account <= 2000 Invalid class: account < 0 Invalid class: 1000 < account < 2000 Invalid class: account > 2000 Gurbakash Phonsa
Example Gurbakash Phonsa
Gurbakash Phonsa
Gurbakash Phonsa
Black box and White box examples
White-Box Testing There exist several popular white-box testing methodologies: 0 Statement coverage 0 branch coverage 0 path coverage 0 condition coverage 0 mutation testing 0 data flow-based testing Gurbakash Phonsa
Statement Coverage Objective: 0 All statements should be executed at least once Gurbakash Phonsa
Example 0 int f1(int x, int y){ 0 1 while (x != y){ 0 2 if (x>y) then 0 3 x=x-y; 0 4 else y=y-x; 0 5 } 0 6 return x; } Gurbakash Phonsa
Statement testing:: Test cases 0By choosing the test set {(x=3,y=3),(x=4,y=3), (x=3,y=4)} 0All statements are executed at least once. Gurbakash Phonsa
Branch Coverage 0Test cases are designed such that: 0Different branch conditions 0Given true and false values in turn. Gurbakash Phonsa
Branch Coverage 0Branch testing guarantees statement coverage: 0A stronger testing compared to the statement coverage-based testing. Gurbakash Phonsa
Example int f1(int x,int y){ 1 while (x != y){ 2 if (x>y) then 3 x=x-y; 4 else y=y-x; 5 } 6 return x; } Gurbakash Phonsa
Example 0 Test cases for branch coverage can be: {(x=3,y=3),(x=3,y=2), (x=4,y=3), (x=3,y=4)} Gurbakash Phonsa
Condition Coverage 0 Test cases are designed such that: 0Each component of a composite conditional expression 0Given both true and false values. Gurbakash Phonsa
Example 0 Consider the conditional expression 0((c1.and.c2).or.c3): 0 Each of c1, c2, and c3 are exercised at least once, 0i.e. given true and false values. Gurbakash Phonsa
Gurbakash Phonsa
Gurbakash Phonsa
Gurbakash Phonsa

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Black box and White box examples