Check response body instead of assigns in settings 2fa recovery codes controller spec

spec/controllers/settings/two_factor_authentication/recovery_codes_controller_spec.rb

@@ -15,10 +15,11 @@ describe Settings::TwoFactorAuthentication::RecoveryCodesController do
       sign_in user, scope: :user
       post :create, session: { challenge_passed_at: Time.now.utc }
 
-      expect(assigns(:recovery_codes)).to eq otp_backup_codes
       expect(flash[:notice]).to eq 'Recovery codes successfully regenerated'
       expect(response).to have_http_status(200)
       expect(response).to render_template(:index)
+      expect(response.body)
+        .to include(*otp_backup_codes)
     end
 
     it 'redirects when not signed in' do