Jest mocks: added @reach/router and stub for Firebase auth signOut method

__mocks__/@reach/router.js

@@ -0,0 +1,17 @@
+import { delay } from '../../src/utils/index';
+
+const ReachRouter = jest.requireActual('@reach/router');
+
+const defaultDelayInMilliseconds = 100;
+
+// eslint-disable-next-line no-unused-vars
+const navigate = async (to, options) => {
+  await delay(defaultDelayInMilliseconds);
+
+  return Promise.resolve();
+};
+
+module.exports = {
+  ...ReachRouter,
+  navigate: jest.fn(navigate),
+};