Integration tests for graphql subscribers

How can I pass the publish / subscribe testing of my graphql schema without using apollo?

Can I just do this with subscriptions-transport-ws? My SubscriptionServer is configured with default settings, I can see the publishing going by simply calling a mutation request with graphql. I have established a connection to the website using my express server

const WebSocket = require('ws');
const myServer = require('../../bin/www');
const wsServer = new WebSocket.Server({
  server: myServer
});

const client = new SubscriptionClient(`ws://localhost:3000/subscriptions`, {}, WebSocket);

client.subscribe(
  {
    query: `subscription roomSubscription(placeId: "someid") {
        user {
            id,
            name
        }
    }`,
  },
  (error, result) => {
      console.log({error, result});
  }
);


const query = `
    mutation { 
        roomAddOrUpdate(placeId: "some id") {
            user {
                name
            }
        }
    }`;
   const result = await graphql(schema, query, {}, req); 

      

        
        
        
      

    

nothing seems to be comforting about the client.subscribe function, not sure if I will go this correct path. You can see my setup here https://github.com/farzd/firstsight/blob/master/bin/www