LordCobar/essentials-of-metaheuristics-groovy — pull request #1 by NicMcPhee (2013-02-10 02:28:11+00:00)
Title: Tests that XO operators don't modify parents

I added tests that the various crossover operators don't modify the parents. These currently fail, supporting my concern that you're not creating *new* individuals, but instead modifying existing ones.

You should probably pull these tests into your code, and then work to try to get them to pass.