What is mutation testing

Answer Posted / tushar

A testing methodology in which two or more program mutations
are executed using the same test cases to evaluate the
ability of the test cases to detect differences in the
mutations.

or

A method whereby errors are purposely inserted into a
program under test to verify that the test can detect the
error. Also known as error seeding.

or

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. Non-intrusive Testing:
Testing that is transparent to the software under test; ie,
testing that does not change the timing or processing
characteristics of the software under test from its behavior
in a real environment. ...

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