public class AbstractBiMapTest extends TestCase {

  // The next two tests verify that map entries are not accessed after they're
  // removed, since IdentityHashMap throws an exception when that occurs.
  @SuppressWarnings("IdentityHashMapBoxing") // explicitly testing IdentityHashMap
  public void testIdentityKeySetIteratorRemove() {
    BiMap<Integer, String> bimap =
        new AbstractBiMap<Integer, String>(