Add support for Rails view components (#644)

Add support for view components

View components are using a block to be able to render slots.

lib/arbre/rails/rendering.rb

@@ -3,8 +3,8 @@ module Arbre
   module Rails
     module Rendering
 
-      def render(*args)
-        rendered = helpers.render(*args)
+      def render(*args, &block)
+        rendered = helpers.render(*args, &block)
         case rendered
         when Arbre::Context
           current_arbre_element.add_child rendered

spec/rails/integration/rendering_spec.rb

@@ -31,6 +31,10 @@ def render_partial_with_instance_variable
     @my_instance_var = "From Instance Var"
     render "arbre/page_with_arb_partial_and_assignment"
   end
+
+  def render_with_block
+    render "arbre/page_with_render_with_block"
+  end
 end
 
 RSpec.describe TestController, "Rendering with Arbre", type: :request do
@@ -45,6 +49,7 @@ def render_partial_with_instance_variable
       get 'test/render_with_instance_variable', controller: "test"
       get 'test/render_partial_with_instance_variable', controller: "test"
       get 'test/render_page_with_helpers', controller: "test"
+      get 'test/render_with_block', controller: "test"
     end
   end
 
@@ -96,4 +101,14 @@ def render_partial_with_instance_variable
     expect(body).to have_css("p", text: "Partial: From Instance Var")
   end
 
+  it "renders with a block" do
+    get "/test/render_with_block"
+    expect(response).to be_successful
+    expect(body).to eq <<~HTML
+      <h1>Before Render</h1>
+      Hello from a render block
+      <h2>After Render</h2>
+    HTML
+  end
+
 end

spec/rails/templates/arbre/page_with_render_with_block.arb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+render_in_object = Class.new do
+  def render_in(_, &block)
+    block.call
+  end
+end.new
+
+h1 "Before Render"
+render render_in_object do
+  "Hello from a render block\n"
+end
+h2 "After Render"