assertEquals(0, map.size());
    assertTrue(map.isEmpty());
    assertFalse(map.removeIfZero(key));

    assertEquals(1, map.incrementAndGet(key));
    assertFalse(map.removeIfZero(key));
    assertEquals(2, map.incrementAndGet(key));
    assertFalse(map.removeIfZero(key));
    assertEquals(1, map.decrementAndGet(key));
    assertFalse(map.removeIfZero(key));
    assertEquals(0, map.decrementAndGet(key));

    return map.remove(key, value);
  }

  /**
   * Atomically remove {@code key} from the map iff its associated value is 0.
   *
   * @since 20.0
   */
  @CanIgnoreReturnValue
  public boolean removeIfZero(K key) {
    return remove(key, 0);
  }

  /**
   * Removes all mappings from this map whose values are zero.
   *