Black Box Testing

It is also known as Functional Testing /component testing

Definition:
Testing the functionality of each and every component vigorously
against requirement specification.

Explanation  of Black Box Testing
It involves  testing the application from the front end point of view.
 Developers treat the application as white box because they
will test and modify the source code.Hence the application should
be transparent or white.

Black box testing is done by testers and they are not allowed
to see the code and only front end is viewed and hence is
called Black Box Testing.


Example of Black Box Testing.
 Business requirement document says user name text field  should
 accept 10 characters  so that user name text field should not take
 more than 10 characters

 Business requirement document says special characters should
not allowed in the user name field so that  field   should allow
only alphabets and numbers..