require "abstract_unit" # This is testing the decoupling of view renderer and view context # by allowing the controller to be used as view context. This is # similar to the way sinatra renders templates. module RenderContext class BasicController < ActionController::Base self.view_paths = [ActionView::FixtureResolver.new( "render_context/basic/hello_world.html.erb" => "<%= @value %> from <%= self.__controller_method__ %>", "layouts/basic.html.erb" => "?<%= yield %>?" )] # 1) Include ActionView::Context to bring the required dependencies include ActionView::Context # 2) Call _prepare_context that will do the required initialization before_action :_prepare_context def hello_world @value = "Hello" render action: "hello_world", layout: false end def with_layout @value = "Hello" render action: "hello_world", layout: "basic" end protected # 3) Set view_context to self def view_context self end def __controller_method__ "controller context!" end end class RenderContextTest < Rack::TestCase test "rendering using the controller as context" do get "/render_context/basic/hello_world" assert_body "Hello from controller context!" assert_status 200 end test "rendering using the controller as context with layout" do get "/render_context/basic/with_layout" assert_body "?Hello from controller context!?" assert_status 200 end end end