I installed Nose on a Mac OSX 10.10.5 with Python2.7.9 using easy_install. The installation appeared to be successful:
Collecting nose
Downlo
I found that going to
Library/usr/bin
and running
sudo easy_install nose
it seems that sometimes it doesn't automatically install nose (and therefore nosetests functionality). Do the above lines, and you should be a-ok.
I wish i had a better explanation for why this happened, but i'm still pretty new, myself.