I'm wondering how to mock a custom event in VUE which is called from a JavaScript function. I've only found examples of mounting a component and using the wrapper to trigger an event, but in my case, I have no component as I am unit testing the JS file.

JS function:

    export default Vue => {
       EventContainer.$emit('add', ...);
       Vue.prototype.$myVar = myVar;
       Vue.$myVar = myVar;
    }

EventContainer.js:

    export default new Vue()

the function is used as: 

myFunction.js

    Vue.myVar