Testing a vue component with cypress, several EventBusses get created

I am testing a vue component with cypress. For my application I am using a global EventBus as described here.

My EventBus.js looks like that:

import Vue from 'vue';
export const EventBus = new Vue();
console.log(EventBus);

The vue component I am testing listens for events on this event bus to show data. In my test I am calling:

EventBus.$on("Event-name", event => {
    //listen on events
});

The data is not getting shown in my component. The problem is probably that there are two EventBusses created instead of one. When logging the EventBus I get:

Vue {_uid: 0, _isVue: true, $options: {…}, _renderProxy: Proxy, _self: Vue, …}

Before my test starts to run. And the following is the EventBus after the tests have started.

Vue {_uid: 2, _isVue: true, $options: {…}, _renderProxy: Proxy, _self: Vue, …}

The console.log is written inside the EventBus.js file, which contains the global EventBus. The uid is different, so I guess Vue created a new EventBus.

How do I get it to work?