Factor out collaboration code (#2313)

Co-authored-by: Lipis <lipiridis@gmail.com>
Co-authored-by: dwelle <luzar.david@gmail.com>

src/tests/binding.test.tsx

@@ -1,6 +1,6 @@
 import React from "react";
 import { render } from "./test-utils";
-import App from "../components/App";
+import ExcalidrawApp from "../excalidraw-app";
 import { UI, Pointer, Keyboard } from "./helpers/ui";
 import { getTransformHandles } from "../element/transformHandles";
 import { API } from "./helpers/api";
@@ -11,8 +11,8 @@ const { h } = window;
 const mouse = new Pointer("mouse");
 
 describe("element binding", () => {
-  beforeEach(() => {
-    render(<App />);
+  beforeEach(async () => {
+    await render(<ExcalidrawApp />);
   });
 
   it("rotation of arrow should rebind both ends", () => {