title: Configuring IntelliJ IDEA for unit testing with JUnit
body: <p>I decided to try out IntelliJ this morning via the trial version and installed the JUnit plugin. I made a new Java project and I want to write a test case for it.</p>
  
  <p>How do I add the junit.jar file to my project? (I actually want to add it to every java project, now and forever more - is there a way of doing that?).</p>