Adventures in Unit Testing 2

index.test.js

const someFunction = require('./index');
const rewire = require('rewire');

let app;
beforeEach(() => {
  someFunction();
  app = rewire('./index.js');
});

test('it should increment evtCount', () => {
  const evtCount = app.__get__('evtCount');
  const somePrivateFunc = app.__get__('somePrivateFunction');
  somePrivateFunc();
  expect(evtCount).toEqual(1);
});