map.entrySet()
        .removeIf(
            entry -> {
              if (entry.getValue().equals(1)) {
                map.put(entry.getKey(), 2);
                return true;
              } else {
                return false;
              }
            });
    assertEquals(3, map.size());
    assertFalse(map.containsValue(1));
  }

  public void testRemoveIfWithConcurrentRemoval() {