def test_iadd(self, evt):
        rval = event.ReturnValue(append_events=[evt])
        rval2 = event.ReturnValue(eat=True, append_events=[evt])
        rset = event.ResultSet()

        rset += rval
        rset += rval2
        rset += None
        assert rset.eat
        assert rset.append_events == [evt, evt]
def dec_r(self, ind):
        r, c = self.row_col(ind)
        r -= 1
        if r < 0:
            r = self.nr - 1
        if r == (self.nr - 1) and c == (self.nc - 1):
            r = self.nr - 2
        return self.indx(r, c)