### Question:
ImmutableEntrySet extends AbstractEntrySet<K, V> { @Override @SuppressWarnings("checkstyle:parameterName") public boolean removeAll(final Collection<?> c) { throw unsupported(); } ImmutableEntrySet(final TrieMap<K, V> map); @Override void clear(); @Override Iterator<Entry<K, V>> iterator(); @Override @SuppressWarnings("checkstyle:parameterName") boolean remove(final Object o); @Override @SuppressWarnings("checkstyle:parameterName") boolean removeAll(final Collection<?> c); @Override @SuppressWarnings("checkstyle:parameterName") boolean retainAll(final Collection<?> c);  }### Answer:
@Test public void testRemoveAll() { assertThrows(UnsupportedOperationException.class, () -> set.removeAll(Collections.emptyList())); }