def METHOD_NAME(self):
    self.ktest(self.t1,'right','right',9,"right at right edge")
    self.t2.set_edit_pos(8)
    self.ktest(self.t2,'right',None,9,"right at right edge-1")
    self.t3.set_edit_pos(0)
    self.t3.keypress((12,),'right')
    assert self.t3.get_pref_col((12,)) == 1