channels: added tests for clean.
channels: added tests for clean.

williamroot/opps,YACOWS/opps,jeanmask/opps,opps/opps,williamroot/opps,williamroot/opps,YACOWS/opps,opps/opps,YACOWS/opps,opps/opps,jeanmask/opps,YACOWS/opps,jeanmask/opps,williamroot/opps,jeanmask/opps,opps/opps