TEST_CASE("insertMany-equality", "[collection]") {
    auto client = mongocxx::client(uri{}, test_util::add_test_server_api());
    auto coll1 = client["db"]["coll1"];
    auto coll2 = client["db"]["coll2"];

    // Two results with the same ObjectIDs compares equal:
    {
        coll1.drop();
        coll2.drop();

        std::vector<bsoncxx::document::value> docs;
        docs.push_back(make_document(kvp("_id", bsoncxx::oid{})));
        docs.push_back(make_document(kvp("_id", bsoncxx::oid{})));

        auto res1 = coll1.insert_many(docs);
        auto res2 = coll2.insert_many(docs);

        REQUIRE(res1 == res2);
    }

    // Two results with the same ints fails to compare!:
    {
        coll1.drop();
        coll2.drop();

        std::vector<bsoncxx::document::value> docs;
        docs.push_back(make_document(kvp("_id", 1)));
        docs.push_back(make_document(kvp("_id", 2)));

        auto res1 = coll1.insert_many(docs);
        auto res2 = coll2.insert_many(docs);

        REQUIRE(res1 == res2); // exception: expected element type k_oid
    }
}