White box Testing

What is White Box Testing?

White box testing is a testing technique, that examines the program structure and derives test data from the program logic/code. The other names of glass box testing are clear box testing, open box testing, logic driven testing or path driven testing or structural testing.

White Box Testing Techniques:

  • Statement Coverage – This technique is aimed at exercising all programming statements with minimal tests.
  • Branch Coverage – This technique is running a series of tests to ensure that all branches are tested at least once.
  • Path Coverage – This technique corresponds to testing all possible paths which means that each statement and branch is covered.

Calculating Structural Testing Effectiveness:

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 %

Advantages of White Box Testing:

  • Forces test developer to reason carefully about implementation.
  • Reveals errors in “hidden” code.
  • Spots the Dead Code or other issues with respect to best programming practices.

Disadvantages of White Box Testing:

  • Expensive as one has to spend both time and money to perform white box testing.
  • Every possibility that few lines of code are missed accidentally.
  • In-depth knowledge about the programming language is necessary to perform white box testing.

One comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s