White box testing

Objective What is White box testing Techniques of white box testing What is Grey Box testing

What is White box testing

Techniques of white box testing

What is Grey Box testing

Testing the internal structure of the software Understand the code and the code will set you free! White-box testing is testing that takes into account the internal mechanism of a system or component It’s also known as Structural testing, clear box testing and glass box testing What is it?

Testing the internal structure of the software

Understand the code and the code will set you free!

White-box testing is testing that takes into account the internal mechanism of a system or component

It’s also known as Structural testing, clear box testing and glass box testing

Techniques Statement coverage Loop testing Path testing Branch testing

Statement coverage

Loop testing

Path testing

Branch testing

Statement Coverage 100% method coverage: All methods in all classes are called. 100% statement coverage: All statements in a method are executed. void foo (int a, b, c, d, e) { if (a == 0) { return; } int x = 0; if ((a==b) OR ((c==d) AND bug(a) )) { x =1; } e = 1/x; }

100% method coverage: All methods in all classes are called.

100% statement coverage: All statements in a method are executed.

void foo (int a, b, c, d, e) {

if (a == 0) {

return; }

int x = 0;

if ((a==b) OR ((c==d) AND bug(a) )) {

x =1; }

e = 1/x; }

Loop testing Test the ‘ for’ and ‘ while’ loops in the code. Look for exceptions of infinite loop. Cause execution of loop to be skipped. Loop to be executed exactly once. Loop to be executed more than once

Test the ‘ for’ and ‘ while’ loops in the code.

Look for exceptions of infinite loop.

Cause execution of loop to be skipped.

Loop to be executed exactly once.

Loop to be executed more than once

Path testing Make sure all the paths are covered. Determine the paths Construct a logic flow chart

Make sure all the paths are covered.

Determine the paths

Construct a logic flow chart

Path testing: Determine Paths FindMean (FILE ScoreFile) { float SumOfScores = 0.0; int NumberOfScores = 0; float Mean=0.0; float Score; Read(ScoreFile, Score); while (! EOF(ScoreFile) { if (Score > 0.0 ) { SumOfScores = SumOfScores + Score; NumberOfScores++; } Read(ScoreFile, Score); } /* Compute the mean and print the result */ if (NumberOfScores > 0) { Mean = SumOfScores / NumberOfScores; printf(“ The mean score is %f
”, Mean); } else printf (“No scores found in file
”); } 1 2 3 4 5 7 6 8 9

FindMean (FILE ScoreFile)

{ float SumOfScores = 0.0;

int NumberOfScores = 0;

float Mean=0.0; float Score;

Read(ScoreFile, Score);

while (! EOF(ScoreFile) {

if (Score > 0.0 ) {

SumOfScores = SumOfScores + Score;

NumberOfScores++;

}

Read(ScoreFile, Score);

}

/* Compute the mean and print the result */

if (NumberOfScores > 0) {

Mean = SumOfScores / NumberOfScores;

printf(“ The mean score is %f
”, Mean);

} else

printf (“No scores found in file
”);

}

Path testing: Logic flow diagram

Branch testing Also known as Conditional Testing Make sure that each possible outcome from a condition is tested at least once. if (i=true) printf (“I am true”) else printf (“I am false”) Possible Testcases are 1. i=true; 2. i=false

Also known as Conditional Testing

Make sure that each possible outcome from a condition is tested at least once.

if (i=true)

printf (“I am true”)

else

printf (“I am false”)

Possible Testcases are

1. i=true; 2. i=false

Grey box testing What is it? Mixture of both black box and white box. Test the system with a basic outlook of internals. When you do? Once the functionality is developed Example Database testing Using SQL

What is it?

Mixture of both black box and white box.

Test the system with a basic outlook of internals.

When you do?

Once the functionality is developed

Example

Database testing

Using SQL

Grey box testing: SQL Some times testers may have to use SQL to help in the black box testing. Types of Grey box using SQL Data Validation Data security Query for system updates

Some times testers may have to use SQL to help in the black box testing.

Types of Grey box using SQL

Data Validation

Data security

Query for system updates

Grey box testing: My examples Testing I did! Test the inventory by using the inventory table Reservation retrieval Data encryption: Credit Card number

Testing I did!

Test the inventory by using the inventory table

Reservation retrieval

Data encryption: Credit Card number

Questions?