Doing test to the tested application to check whether 
testing is completely done or not.

nothing but testing to a tested application is mutation 
testing

This comes in White box testing. This is to find the 
effectiveness of a test case after making some changes in 
the code. Here we have some terms like killed mutants, live 
mutants

Here mutation is nothing but alteration  ...
A method to determine test set thoroughness by measuring 
the extent to which a test set can discriminate the program 
from slight variants of the program.

mutation is comes under white box testing. mutation is 
nothing but a complex change in coding.In this we r 
forcebly making some changes in the coding and chacking 
whether it gives the correct (or) wrong results. if it give 
wrong result then our test is passed and if it give correct 
result then the test is failed.


Correct me if i posted wrong answer:)

HI

Mutation : What is Mutation ?
            Change in Order (Can be Software code or 
Genetic Code).

Mutation Testing: Change the Existing Software Code(Normal 
Functionality) Through mutation & Test The Application.

Result: The Application Should show Bugs while Text 
Execution.

S.Ramprasad.   
Any Commnet sun_ramprasad@yahoo.com

Hi 
Mutation testing is forcibily injecting bugs and testing 
the application.
It means makin changes in code and testing how the 
application works

Correct me if i am wrong

Mutation Testing is to Test for Negative Values of Input to
make sure the AUT(Application Under Test) is Passing or
Behaving as per specified.
For Negative Test Data application should give negative
response.

In case of Login window with Negative set of data i.e.,input
data username & Password the Login window should not open
the  Inbox

Mutation means change in a program. In this testing 
programmer will change the code without disturbing 
functionality.

Mute means bug. In this testing programmer intensionally 
introduce the bug into the program and validates 
completeness and correctness of the program.

mutation testing is the white box testing .In which the
operator remains constant the operands only change.

example:
 2+4=7
 john+son=johnson

Mutation testing is a fault-based testing technique that is 
based on the assumption that a program is well tested if 
all simple faults are predicted and removed; complex faults 
are coupled with simple faults and are thus detected by 
tests that detect simple faults.

Mutation Testing means a complex change in coding. It means
make a change in coding and run the test if all tests are
passed in that changing area then the test is failed. If
some of the tests are failed in that changing area then the
test is passing. This type of testing is called Mutation
testing. This testing is done in Unit testing.

Mutations are Change in program,These mutations are 
introduced into the source code of program-in rendering 
pages these  changes will impacts- while testing all the 
impacted areas will be checked.