Solution to `It looks like you called `mount()` without a global document being loaded.`

mocha-runner.js

// enzyme requires you to set up jsdom for rendering
var jsdom = require('jsdom').jsdom;

var exposedProperties = ['window', 'navigator', 'document'];

global.document = jsdom('');
global.window = document.defaultView;
Object.keys(document.defaultView).forEach((property) => {
  if (typeof global[property] === 'undefined') {
    exposedProperties.push(property);
    global[property] = document.defaultView[property];
  }
});

global.navigator = {
  userAgent: 'node.js'
};

// any other stuff you may have in your runner file

mocha.opts

//example only
--compilers ts-node/register
--check-leaks
--no-exit
--require babel-polyfill
--require ./mocha-runner
--recursive