1. Structural Testing
Saranya.V
AP/CSE,
Sri Vidya College of Engineering & Technology,
Virudhunagar

2. 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.

3. Categories of Structural Testing
Statement Coverage
Path Coverage
Branch Coverage
Condition Coverage

4. 1. Statement Coverage
 Weakest form of testing.
 Because this kind of
testing requires that Begin
every statement in the
code has been executed
at least once. yes
Ex: Y>=0 Y=0-y
Begin
If(y>= 0) then y=0-y; No
Abc=y; Abc=y
end

5. 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.

7. 3. Condition Coverage Testing
• Check all possible
combinations of IF ("X && Y")
conditions.
• While branch TEST 1: X=TRUE,
coverage is stronger
than statement Y=FALSE
coverage, its not TEST 2: X=FALSE,
suitable for multiple Y=TRUE
conditions checking.

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

9. 4. Path Coverage Testing
 Paths in the program executed
at least once. 1 2
 Independent path can be P1 F
T
defined in terms of CFG.
 White box testing is used here.
P2 F
 Test the each independent path. T
 But this process will be complex
one when the loop occurs.