decorator

lib/product.rb

@@ -1,3 +1,5 @@
+require 'forwardable'
+
 class Product
   attr_reader :name, :category, :tags
 
@@ -6,6 +8,16 @@ def initialize(name, category, tags = [])
     @category = category
     @tags = tags
   end
+end
+
+class ProductDecorator
+  extend Forwardable
+
+  def_delegators :@context, :name, :category, :tags
+
+  def initialize(context)
+    @context = context
+  end
 
   def as_html_row
     <<~EOF

spec/anything_spec.rb

@@ -27,6 +27,6 @@
   end
 
   it 'can be printed as HTML table row' do
-    expect(tomato.as_html_row).to eq(expected_result)
+    expect(ProductDecorator.new(tomato).as_html_row).to eq(expected_result)
   end
 end