jest and mongoose - jest has detected opened handles

Question

So I\'m using jest to test my node.js application and the tests finish fine but I\'m getting a message from jest about open handles. Any insights?

Answer 1

It seems your mongoose connection remains open after your test, try one of the following:

1. close server instance after test.

   const server = require('./app'); //server instance    
   server.close(); //put in afterAll or afterEach depending on your test
   

2. close your database connection after all your test.

   afterAll(()=>{ mongoose.connection.close();});
   

3. wrap your mongoose connection with async/await.

   async function(){
      await mongoose.connect(mongoDB);
   };
   

try one or a combination. These are my solutions since I can't really see your code.