public static String formatFlows(long flows) {
        if (flows < 1) {
            return EMPTY;
        }
        return String.valueOf(flows) + SPACE + (flows > 1 ? FLOWS : FLOW);
    }
@Test
    public void formatManyFlows() {
        String f = TopoUtils.formatFlows(42);
        assertEquals(AM_WL, "42 flows", f);
    }