Cleanup integration and unit tests (#3531)

- Make mockWindow a function and call it when needed

- Change timeouts so that better error messages happen more often in
  integration tests

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/renderer/components/render-delay/__tests__/render-delay.test.tsx

@@ -22,6 +22,9 @@ import React from "react";
 import "@testing-library/jest-dom/extend-expect";
 import { render } from "@testing-library/react";
 import { RenderDelay } from "../render-delay";
+import { mockWindow } from "../../../../../__mocks__/windowMock";
+
+mockWindow();
 
 describe("<RenderDelay/>", () => {
   it("renders w/o errors", () => {