chruby_reset_test.sh: Added a test for the previous commit.
chruby_reset_test.sh: Added a test for the previous commit.

It sets GEM_HOME and GEM_ROOT to be empty.  It sets PATH to something that is guaranteed to have /bin in it, and it makes sure that chruby_reset does not mess up that path.

ilikepi/chruby,ngpestelos/chruby,JeanMertz/chruby-fish,kbrock/chruby,rstacruz/chruby-fish,rstacruz/chruby-fish,postmodern/chruby,kbrock/chruby,regularfry/chruby,postmodern/chruby,regularfry/chruby,JeanMertz/chruby-fish,ngpestelos/chruby,eunomie/chgo,eunomie/chgo,ilikepi/chruby