sinon-tut-db-conn.js

const mongoose = require("mongoose");
const username = "root";
const password = "example";
const dbname = "mongo-sinon";

mongoose.connect(
  `mongodb://${username}:${password}@localhost:27017/${dbname}?authSource=admin&readPreference=primary`,
  {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  }
);

const db = mongoose.connection;
db.on("error", console.error.bind(console, "connection error: "));
db.once("open", async function () {
  console.log("Connected successfully");
});