public void TestGetDocumentId()
{
#pragma warning disable 618
var expectedId = new BsonObjectId(ObjectId.GenerateNewId());
var wrapper = new BsonDocumentWrapper(new BsonDocument("_id", expectedId));
Assert.AreEqual(false, wrapper.IsMaterialized);
object id;
Type idNominalType;
IIdGenerator idGenerator;
wrapper.GetDocumentId(out id, out idNominalType, out idGenerator);
Assert.AreEqual(true, wrapper.IsMaterialized);
Assert.IsInstanceOf <BsonObjectId>(id);
Assert.AreEqual(expectedId, id);
Assert.AreSame(typeof(BsonValue), idNominalType);
Assert.IsInstanceOf <BsonObjectIdGenerator>(idGenerator);
#pragma warning restore
}