Delete Account unit tests: added tests related to Google reauthentication

__mocks__/gatsby-plugin-firebase/auth/googleAuthProvider.js

@@ -0,0 +1,10 @@
+import AuthProvider from './authProvider';
+import Constants from '../constants/auth';
+
+class GoogleAuthProvider extends AuthProvider {
+  constructor() {
+    super(Constants.googleAuthProviderId);
+  }
+}
+
+export default GoogleAuthProvider;