white box testing code example

Example 1: white box testing

white box testing 
When the tester knows the code behind
functionality and uses that knowledge for testing
purposes, it is called white box testing.
Unit test is considered as white box testing.

Example 2: what is black box testing

When the tester does not know the code
behind the functionality, it is called black box testing.
 Testers do not need that code in order to
 test the functionality. This is mostly what we as testers do.

Example 3: whitebox testing

Statement Testing = (Number of Statements Exercised / Total Number of Statements) x 100 %

Branch Testing = (Number of decisions outcomes tested / Total Number of decision Outcomes) x 100 %

Path Coverage = (Number paths exercised / Total Number of paths in the program) x 100 %