Some standard fitness tests that are used on the national and international stage include the Beep Test (a 20-meter shuttle test) or a Yo-Yo test (a variation of the Beep Test). I find the summer is a good time to test yourself and get a benchmark score, so that as you continue to increase your fitness you have something for comparison. Here are links to instructions for these tests:
http://www.thebeeptest.com/download.html (International 7s players run Level 14+)
http://www.topendsports.com/testing/tests/yo-yo-intermittent.htm (International 7s players run Level 18+)
If you have these test scores handy, I suggest including it on your Rugby Resume to give coaches a sense of what level of fitness you have. The fitter you are, the better your chances are of being recruited and being successful at the college level.