mongocxx::uri uri("XXX");
  mongocxx::client client(uri);
  bsoncxx::oid id;
  std::string name = id.to_string();
  mongocxx::database db = client[name];
  mongocxx::options::create_collection opt;
  opt.capped(true).size(10000).max(3);
  mongocxx::collection col = db.create_collection(name,opt);
  bsoncxx::builder::stream::document insert { };
  int n = 13;
  for (int i = 0; i < n; i++) {
    insert << "CollectionTest::CreateCappedCollection" << "ok"
        << "capped_id" << id;
    col.insert_one(insert.view());
    insert.clear();
  }
  bsoncxx::builder::stream::document docFind { };
  mongocxx::options::find optFind;
  optFind.cursor_type(mongocxx::cursor::type::k_tailable);
  mongocxx::cursor cursor = col.find(docFind.view(),optFind);
  ASSERT_TRUE(cursor.begin() != cursor.end());
  int m = 0;
  for (auto doc : cursor){
    m++;
  }
  ASSERT_EQ(3,m);
  insert << "CollectionTest::CreateCappedCollection" << "ok"
      << "capped_id" << id;
  col.insert_one(insert.view());
  ASSERT_TRUE(cursor.begin() != cursor.end());
  for (auto doc : cursor){
    m++;
  }
  ASSERT_EQ(4,m);

	mongocxx::stdx::optional<mongocxx::cursor::type> expected_cursor_type{};
	mongocxx::stdx::optional<bsoncxx::types::value> expected_hint{};
	mongocxx::stdx::optional<bool> expected_no_cursor_timeout;
	mongocxx::stdx::optional<bsoncxx::document::view> expected_sort{};

	collection_find_with_opts->interpose([&](mongoc_collection_t*, const bson_t* filter,
                                                 const bson_t* opts,
                                                 const mongoc_read_prefs_t* read_prefs) {
            collection_find_called = true;

            bsoncxx::document::view filter_view{bson_get_data(filter), filter->len};
            bsoncxx::document::view opts_view{bson_get_data(opts), opts->len};

            REQUIRE(filter_view == doc);

            if (expected_allow_partial_results) {
		REQUIRE(opts_view["allowPartialResults"].get_bool().value ==
			*expected_allow_partial_results);
            }
            if (expected_comment) {
		REQUIRE(opts_view["comment"].get_utf8().value == *expected_comment);
            }
            if (expected_cursor_type) {
		bsoncxx::document::element tailable = opts_view["tailable"];
		bsoncxx::document::element awaitData = opts_view["awaitData"];
...