public void triggerRemoveAll(final String selectorId) {
        synchronized (lock) {
            healthyUpstream.remove(selectorId);
            unhealthyUpstream.remove(selectorId);
        }
    }
@Test
    public void testTriggerRemoveAll() {
        final String selectorId = "s1";
        Upstream upstream = mock(Upstream.class);
        healthCheckTask.triggerAddOne(selectorId, upstream);
        healthCheckTask.triggerRemoveAll(selectorId);
        assertFalse(healthCheckTask.getHealthyUpstream().containsKey(selectorId));

        healthCheckTask.triggerAddOne(selectorId, upstream);
        healthCheckTask.triggerRemoveAll(selectorId);
        assertFalse(healthCheckTask.getHealthyUpstream().containsKey(selectorId));
    }