require "abstract_unit" class ControllerHelperTest < ActionView::TestCase tests ActionView::Helpers::ControllerHelper class SpecializedFormBuilder < ActionView::Helpers::FormBuilder ; end def test_assign_controller_sets_default_form_builder @controller = OpenStruct.new(default_form_builder: SpecializedFormBuilder) assign_controller(@controller) assert_equal SpecializedFormBuilder, default_form_builder end def test_assign_controller_skips_default_form_builder @controller = OpenStruct.new assign_controller(@controller) assert_nil default_form_builder end end