Unit testing is a method of testing source code that verifies that individualunits are working properly. A unit of code refers to the smallest testable partof an application. In OCaml, this was a function, and in Java, this is a method.JUnit is a Java package that implements unit testing. Eclipse provides tools toautomate the creation of JUnit tests. It also provides a good interface forrunning the tests. Together these two tools make systematically testing yourprogram very easy.