Using server host and port in the tests

__tests__/e2e/peer1.test.js

 import { Selector } from "testcafe"
 
-fixture`Peer 1`.page`localhost:3000`
+const host = "0.0.0.0"
+const port = process.env.PORT || 3000
+
+fixture`Peer 1`.page`${host}:${port}`
 
 const idAppearTimeout = 1000
 const selectorOptions = { timeout: 100 }
@@ -8,6 +11,7 @@ const selectorOptions = { timeout: 100 }
 test("Connection id appears", async (t) => {
   const userId = async () =>
     await Selector("#user-id").with(selectorOptions).value
+
   await t
     .wait(idAppearTimeout)
     .expect((await userId()).length)
@@ -16,6 +20,7 @@ test("Connection id appears", async (t) => {
 
 test("Clicking and dragging on whiteboard creates a single child element", async (t) => {
   const whiteboard = Selector("#whiteboard").with(selectorOptions)
+
   await t
     .drag(whiteboard, 10, 10)
     .expect(whiteboard.childElementCount)

__tests__/e2e/peer2.test.js

 import { Selector } from "testcafe"
 
-fixture`Peer 2`.page`localhost:3000`
+const host = "0.0.0.0"
+const port = process.env.PORT || 3000
+
+fixture`Peer 2`.page`${host}:${port}`
 
 const selectorOptions = { timeout: 100 }