Functional and Funtionality Testing

Functional  and Functionality Testing

Functional Testing:
After completing the user interface testing test engineers
concentrateon Functional testing  to validate the customer 
requirements.

 Note : User interface testing:Testing three factors on every screen
of the build.
                           1) Ease to use 
                            2)Look and feel(GUI)
                            3)Speed in interface

 Functional testing involves  testing each component is working
fine or not.
For example:1) For Email field if testers enter invalid data whether
it showing warning or not.(Validation)
              2)For Fax field testers enter  invalid data like alphabets
showing warning or not..

A procedure to drive and /or select test cases based on analysis
of the specification of the functionality of a component or system
without reference to its internal structure or internal logic.

• Testing the product features at early phase of  the Life cycle

Functionality Testing
  Functionality testing is nothing but to test whether product or application
 is build as per customer requirement specified in system requirement
specification.

For Example:
1) SRS  specifies application should work in multiple
  Browser. 
2)customer specifies in a email, user should have
  privilege to  specify the number of mails at once.
3)In Gmail application by clicking logout button it should
return back to home page.

In above examples there is certain logic that  customer specified
in srs.Testing this kind of scenarios is called Functionality Testing .

Functionality testing is nothing but to test whether product or
applicationis build as per customer requirement specified in system
requirement specification.

Testing the product features at every phase of the life cycle that is
Adhoc Testing,Integration Testing and System Testing.