add example failing testcase for #353

Author: stevestmartin

test/react/rails/pages_controller_test.rb

@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class PagesControllerTest < ActionController::TestCase
+  test 'should not raise react_component undefined in ActionController::TestCase' do
+    get :show, id: 1
+    assert_not_raised ActionView::Template::Error
+  end
+end