Move unit tests data in setUp
Move unit tests data in setUp

When unit testing the various methods of cat2cohort,
we need some example data (input and expected output).
It makes sense to share it among testing methods through
the setUp method mechanism.

Commonists/wm_metrics,danmichaelo/wm_metrics,Commonists/wm_metrics,danmichaelo/wm_metrics,danmichaelo/wm_metrics,Commonists/wm_metrics,danmichaelo/wm_metrics,Commonists/wm_metrics