smarter db connection

tests

config/db.js

@@ -4,4 +4,15 @@ const config = require('./');
 const { host, port, name } = config.db;
 const connectionString = `mongodb://${host}:${port}/${name}`;
 
-mongoose.connect(connectionString);
+async function connect() {
+  await mongoose.connect(connectionString);
+}
+
+async function disconnect() {
+  await mongoose.disconnect();
+}
+
+module.exports = {
+  connect,
+  disconnect,
+};