How do I close web3 such that mocha tests exit properly?

Question

I'm writing a simple NodeJS (Node 9.4.0) server that's using web3 (1 beta) to interact with Ethereum.

I've created a simple utility web3 as follows:

const Web3 = require('web3')

const url = process.env.WEB3_PROVIDER_URL || 'ws://localhost:8546'
const web3 = new Web3(Web3.givenProvider || url)

module.exports = web3

I've written a trivial mocha (4.0) test as follows

const { expect } = require('chai')
const web3 = require('../../../src/utils/web3')

describe('web3', () => {
  it('exists', () => {
    expect(web3).to.exist
  })
})

The test passes fine but mocha never exists unless I add the --exit flag.

How can I close or otherwise cleanup web3 after my test so mocha exists correctly without the use of the --exit flag?

Answer 1

Does it work like this?

describe('web3', () => {
  it('exists', (done) => {
    if(web3.currentProvider) {
      web3.currentProvider.reset() // or something...
    }
    done();
  })
})

The code above is untested, but you may get the idea.