Writing tests for applications is probably one of the most important aspects of modern software development. NetBeans provides the facility to write and run both JUnit and TestNG tests and test suites. In this section, we'll provide details on how NetBeans allows us to write and run these types of tests, but we'll assume that you have some knowledge of either JUnit or TestNG.
Tip
For more information on JUnit, check out http://junit.org. You can read more about TestNG at http://testng.org.
TestNG support is provided by default with NetBeans, however, due to license concerns, JUnit may not have been installed when you installed NetBeans. If JUnit support is not installed, it can easily be added through the NetBeans Plugins system.
In a project, NetBeans creates two separate source roots: one for application sources and the other for test sources. This allows us to keep tests separate from application source code so that when we ship applications, we do not need to ship tests...