Jest did not exit one second after the test run has completed using express

Question

I\'m using JEST for unit testing my express routes.

While running the yarn test all my test case are getting passed, but I\'m getting an error

Answer 1

For me it was a different issue I was using supertest to test routes itself so I had to close the connection to the server itself.

afterAll(done => {
    server.close();
    done();
});

If this is not the case for you this issue might have something for you

Answer 2

I was having the same issue but in my package.json file i added "test": "jest --detectOpenHandles" and ran npm test --detectOpenHandles. I didn't get the error message this time. Maybe you can try doing that.

Answer 3

This worked for me

const mongoose = require('mongoose');
    afterAll(async(done) => {
  // Closing the DB connection allows Jest to exit successfully.
  try {
    await mongoose.connection.close();
    done()
  } catch (error) {
    console.log(error);
    done()
  }
  // done()
})

Answer 4

My problem was solved by this code:

beforeAll(done => {
  done()
})

afterAll(done => {
  // Closing the DB connection allows Jest to exit successfully.
  mongoose.connection.close()
  done()
})

Answer 5

On my side, I just separate app.listen() from my app. So with express, your app finish with an export.

// index.js
module.exports = app;

And just create another file to listen the port.

// server.js
const app = require('./index')
app.listen(...)

And if you import just the index (app index.js) in your tests, it should work with no extra config. Of course your need to adjust the start of your express app. It should use now server.js.