Detox your GraphQL: Functions for starting the server

startServerFunctions.js

const express = require("express");

const PORT = 8089;

let graphQLServerApp;
let httpServer;

function startHttpServer() {
  return new Promise(resolve => {
    httpServer = graphQLServerApp.listen(PORT, () => {
      resolve();
    });
  });
}

async function startGraphQLServer(mock = {}) {
  if (httpServer) {
    console.warn("Tried to start HTTP server, when there's already one.");
    return;
  }

  graphQLServerApp = express();
  const server = createServerWithMockedSchema(mock);

  server.applyMiddleware({
    app: graphQLServerApp
  });

  // we want to wait for the server to start listening
  await startHttpServer();
}