Flaky Tests with Moxios

[cashmann]

I'm using moxios in two files to mock out API requests and getting tests that seem to randomly fail.
For example:

import { expect } from 'chai'
import moxios from 'moxios'
import { SharedState, updateRenewal, mbcRequest, fetchVersions } from '../../../app/javascript/packs/sharedState.js'

const genericResponse = {
  id: 1,
  status: 'approved',
  versions: ['underwriting', 'approved']
}

describe('SharedState', () => {
  SharedState.currentRenewal = { id: 1 }

  beforeAll(() => {
    moxios.install()
    moxios.stubRequest('/commercial_renewals/1', {
      status: 200,
      response: genericResponse
    })
  })

  afterAll(() => {
    moxios.uninstall()
  })

  describe('updateRenewal', () => {
    let basic_params = {
      id: 1,
      status: 'approved'
    }

    it('updates the attributes on the SharedState updatedRenewals field', (done) => {
      let attribute = basic_params['status'];

      moxios.wait(() => {
        updateRenewal(basic_params);
        expect(SharedState.updatedRenewals[basic_params['id']]['status']).to.equal(attribute);
        done();
      })
    });
  });
...

If I run this test file, followed by another test file with a similar moxios setup, I get various errors around afterAll and variables being undefined and I don't quite get why.