connect ECONNREFUSED 127.0.0.1:80 only on one test

I read #484 and my case is a bit different

I have 12 passing tests, but the one below keeps throwing `connect ECONNREFUSED 127.0.0.1:80`

It's the only one that uses `del` so maybe that's the problem?

```js
describe('deleteOne', () => {
it('should delete task', async done => {
const { token } = await createUser() // this works
const { _id } = await createTask(token) // this works
const res = await request(app)
.del(`api/tasks/${_id}`)
.set('authorization', 'Bearer ' + token)
expect(res.statusCode).toEqual(204)
done()
})
})
```