} @MapFeature.Require(SUPPORTS_REMOVE) @CollectionSize.Require(ZERO) public void testEmptyMapPollFirst() { assertNull(navigableMap.pollFirstEntry()); } @CollectionSize.Require(ZERO) public void testEmptyMapNearby() { assertNull(navigableMap.lowerEntry(samples.e0.getKey())); assertNull(navigableMap.lowerKey(samples.e0.getKey())); assertNull(navigableMap.floorEntry(samples.e0.getKey())); assertNull(navigableMap.floorKey(samples.e0.getKey())); assertNull(navigableMap.ceilingEntry(samples.e0.getKey())); assertNull(navigableMap.ceilingKey(samples.e0.getKey())); assertNull(navigableMap.higherEntry(samples.e0.getKey())); assertNull(navigableMap.higherKey(samples.e0.getKey())); }