Structural Testing

Saranya.VAP/CSE,

Sri Vidya College of Engineering & Technology,Virudhunagar

Test cases based upon the structure of the code under testing.

Stronger than other testing methodologies.Complementary Testing:Testing strategy (A) detects some errors.Testing strategy (B) detects some more errors

which is uncovered by (A). This is known as complementary testing strategy.

Categories of Structural Testing

Statement CoveragePath CoverageBranch CoverageCondition Coverage

Weakest form of testing.Because this kind of

testing requires that every statement in the code has been executed at least once.

Ex:BeginIf(y>= 0) then y=0-y;Abc=y;end

yes

No

Begin

Y>=0

Abc=y

Y=0-y

2. Branch Coverage

Test cases are generated to test each branch condition assume true or false values in turn.

Also known as Edge Testing.Edge of the programs control flow graph is

traversed at least once.These kind of test cases checks Branches of

decision box.

3. Condition Coverage TestingIF ("X && Y")

TEST 1: X=TRUE, Y=FALSETEST 2: X=FALSE, Y=TRUE

• Check all possible combinations of conditions.

• While branch coverage is stronger than statement coverage, its not suitable for multiple conditions checking.

• Example: “if (A or B)” requires 4 test cases:A = True, B = TrueA = True, B = FalseA = False, B = TrueA = False, B = False

4. Path Coverage TestingPaths in the program executed at

least once. Independent path can be defined

in terms of CFG.White box testing is used here.Test the each independent path.But this process will be complex

one when the loop occurs.

1 2

T F

T F

P1

P2