<P> Test data is data which has been specifically identified for use in tests, typically of a computer program . </P> <P> Some data may be used in a confirmatory way, typically to verify that a given set of input to a given function produces some expected result . Other data may be used in order to challenge the ability of the program to respond to unusual, extreme, exceptional, or unexpected input . </P> <P> Test data may be produced in a focused or systematic way (as is typically the case in domain testing), or by using other, less - focused approaches (as is typically the case in high - volume randomized automated tests). Test data may be produced by the tester, or by a program or function that aids the tester . Test data may be recorded for re-use, or used once and then forgotten . </P>

What is the purpose of testing a program with sample data