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/+extensions/__tests__/extensions.test.tsx

@@ -30,6 +30,9 @@ import { ConfirmDialog } from "../../confirm-dialog";
 import { ExtensionInstallationStateStore } from "../extension-install.store";
 import { Extensions } from "../extensions";
 import mockFs from "mock-fs";
+import { mockWindow } from "../../../../../__mocks__/windowMock";
+
+mockWindow();
 
 jest.setTimeout(30000);
 jest.mock("fs-extra");