Setting up JUnit in your Eclipse Project

The following is the first steps to adding JUnit test cases to your Eclipse project. It's the first step in working your processes towards Test Driven Development, which is the bread and butter of Agile and XP Programming methodologies and techniques.

Step 1: Download JUnit

The first step is to download the most recent version of JUnit (look for the 'Releases' link off the homepage). At the time of this article, the latest version was 4.6.

Step 2: Add JUnit to your Eclipse project's build path.

Right click on your project and select 'Properties'.
Click 'Java Build Path'.
Click the 'Libraries' tab.
Click 'Add JARs' (if you've added the JAR into your workspace)
or
Click 'Add External JARs' (if you are linking the JAR from outside your workspace)
In the GUI, select the JUnit jar (junit-4.6.jar).

Step 3: Organize your source folders

One recommended practice is to organize your source folders into the following structure:

[project]
-- src    
-- main   (module code)
-- test   (test code only)

Create the above directory structure under your project in Eclipse.
Right click on your project and select 'Properties'.
Click 'Java Build Path'.
Click the 'Source' tab.
Add the 'main' and 'test' folders as source folders in your project and deselect 'src' as a source folder.

Ready to go

You now have effectively integrated JUnit into your project, provided a clean way to separate your code base with your testing code.

Any questions, feel free to comment and I'll get back to you as soon as I can.