@Test
  public void testWriteConcernResolver() {

    PersonWithIdPropertyOfTypeObjectId person = new PersonWithIdPropertyOfTypeObjectId();
    person.setId(new ObjectId());
    person.setFirstName("Dave");

    template.setWriteConcern(WriteConcern.NONE);
    template.save(person);
    WriteResult result =
        template.updateFirst(
            query(where("id").is(person.getId())),
            update("firstName", "Carter"),
            PersonWithIdPropertyOfTypeObjectId.class);
    WriteConcern lastWriteConcern = result.getLastConcern();
    assertThat(lastWriteConcern, equalTo(WriteConcern.NONE));

    FsyncSafeWriteConcernResolver resolver = new FsyncSafeWriteConcernResolver();
    template.setWriteConcernResolver(resolver);
    Query q = query(where("_id").is(person.getId()));
    Update u = update("firstName", "Carter");
    result = template.updateFirst(q, u, PersonWithIdPropertyOfTypeObjectId.class);
    lastWriteConcern = result.getLastConcern();
    assertThat(lastWriteConcern, equalTo(WriteConcern.FSYNC_SAFE));

    MongoAction lastMongoAction = resolver.getMongoAction();
    assertThat(lastMongoAction.getCollectionName(), is("personWithIdPropertyOfTypeObjectId"));
    assertThat(lastMongoAction.getDefaultWriteConcern(), equalTo(WriteConcern.NONE));
    assertThat(lastMongoAction.getDocument(), notNullValue());
    assertThat(
        lastMongoAction.getEntityClass().toString(),
        is(PersonWithIdPropertyOfTypeObjectId.class.toString()));
    assertThat(lastMongoAction.getMongoActionOperation(), is(MongoActionOperation.UPDATE));
    assertThat(lastMongoAction.getQuery(), equalTo(q.getQueryObject()));
    assertThat(lastMongoAction.getDocument(), equalTo(u.getUpdateObject()));
  }