How to get store values (VueJS with Vuex) while testing in Nightwatch?

In one of my tests I want to check if the store get updated correctly. To do so I need to access the store itself within Nightwatch. How do I do that ?

Since my store is declared in main.js like so I'm guessing it should be available in the global scope of the browser object but I can't find it ?!

How am I supposed to acheive this ?

global.store = store
global.app = new Vue({
  store,
  vuetify,
  render: h => h(App)
}).$mount('#app')