require "abstract_unit" module ERBTest class DeprecatedErubisImplementationTest < ActionView::TestCase test "Erubis implementation is deprecated" do assert_deprecated "ActionView::Template::Handlers::Erubis is deprecated and will be removed from Rails 5.2. Switch to ActionView::Template::Handlers::ERB::Erubi instead." do assert_equal "ActionView::Template::Handlers::ERB::Erubis", ActionView::Template::Handlers::Erubis.to_s assert_nothing_raised { Class.new(ActionView::Template::Handlers::Erubis) } end end end end