Check mongoose connection state without creating new connection

Question

I have some tests - namely Supertest - that load my Express app. This app creates a Mongoose connection. I would like to know how to check the status of that connection from within my test.

In app.js

mongoose.connect(...) 

In test.js

console.log(mongoose.connection.readyState); 

How to access the app.js connection? If I connect using the same parameters in test.js will that create a new connection or look for existing one?

Answer 1

Since the mongoose module exports a singleton object, you don't have to connect in your test.js to check the state of the connection:

// test.js require('./app.js'); // which executes 'mongoose.connect()'  var mongoose = require('mongoose'); console.log(mongoose.connection.readyState); 

ready states being:

• 0: disconnected
• 1: connected
• 2: connecting
• 3: disconnecting