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Different types of coverage in

White Box testing

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Coverage types

1) Statement coverage

2) Branch coverage

3) Path coverage4) LCSAJ coverage

5) Condition coverage

(i) Basic conditions coverage(ii) Modified condition / Decision coverage

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Statement coverage

Every statement of the program should be exercised atleast once

Eg 1.

Main(){

Int a,b;

Scanf(%d%d,&a,&b)

Printf(a is big);

Ptintf(b is big);

}

How many test case required to cover the statement?

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Statement coverage Eg. Con

Main()

{

Int a,b;

Scanf(%d%d,&a,&b)

If(a>0)

{

Printf(a is big);

Ptintf(b is big);

}}

How many number of test cases required to cover thestatement?

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Statement coverage Eg. Con

Main()

{

Int a,b;

Scanf(%d%d,&a,&b)If(a>b)

Printf(a is big);

Else

Ptintf(b is big);}

How many number of test cases required to cover thestatement?

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Branch Coverage

or

Decision Coverage

Every possible alternative in a branch (or,decision) of the program should be

exercised at least once.

For if statements this means that the

branch must be made to take on the

values true and false.

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Branch Coverage (or) Decision

Coerage Eg.Main(){

Int a,b;

Scanf(%d%d,&a,&b)

If(a>100)Printf( statement 1);

Else if ((a>=50) || (b==10))

Printf( statement 2);

Else

Printf( statement 3);

}How many number of test cases required to cover the Branch?

So branch coverage implies both 100% decision coverage and100% statement coverage

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Path coverageEvery execution path of theprogram should be exercised at

least once.

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LCSAJ coverage:

A LinearCode Sequence And Jump,

consisting of the following three items

(conventionally identified by line numbers

in a source code listing): the start of the

linear sequence of executable statements,

the end of the linear sequence, and the

target line to which control flow istransferred at the end of the linear

sequence.

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Example forCondition coverage

Main()

{

Int a,b;

Scanf(%d%d,&a,&b)

If(a>100)

Printf( statement 1);

Else if ((a>=50) || (b==10))

Printf( statement 2);

Else

Printf( statement 3);

}How many number of test cases required for basic condition and

MC/DC?

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How many number of test cases required for

statement , Branch, Basic condition and

MC/DC coverage?void main(void)

{

int a, b, c;

scanf("%d %d %d", a, b, c);

if ((a > 1) && (b == 0))

b = c / a;

if ((a == 2) || (c > 1))

c = c + 1;

while (a >= 2)a = a - 2;

printf("%d %d %d", a, b, c);

}

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Conclusion

branch coverage implies both 100%

decision coverage and 100% statement

coverage

100% LCSAJ coverage implies 100%

decision coverage.

100% decision coverage implies both 100%

branch coverage and 100% statement

coverage.

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Few more example

Read p

Read q

IF p+q > 100 THENPrint "Large"

ENDIF

IF p > 50 THEN

Print "p Large"

ENDIF

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Few more example

If x=3 then

Display_messageX;

If y=2 thenDisplay_messageY;

Else

Display_messageZ;

Else

Display_messageZ;

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Few more example

IF A > B THEN

C = A B

ELSE

C = A + B

ENDIF

ReadD

IF C = D Then

PrintError

ENDIF

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Any more clarification Required?

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Thank you