Click Run (actually the down-arrow next to the the green button), choose 'Run Configurations...'
Select "Java Application" from the left-hand panel, and click the "new" icon (top left).
Fill out the Main tab as below Image Removed
Fill out the Arguments tab as below below
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The harness makes extensive use of the java 'assert' keyword, so you should run the harness with '-ea' in the VM options.