For maintaining and developing the projects Software Development Life Cycle (SDLC) was very useful for all software projects. The image below demonstrate life cycle of SDLC.
In order to test the software project or application developer need to use the some of the test Scripts and test cases or test scenarios for complete testing process. The below image demonstrate about Manual Testing.
JUnit has the ability to integrate with most of the popular build systems for Java including Ant and Maven.
JUnit runner is used to see the running test and figure out what test exist and how it ought to run them and report those outcomes.