Add spec helper to README.md

README.md

@@ -245,6 +245,28 @@ class ErbImplementationTest < ActiveSupport::TestCase
   end
 end
 
+```
+If you're using RSpec you can add the following code to `spec/better_html_spec.rb`
+
+```ruby
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe "BetterHtml" do
+  it "does assert that all .html.erb templates are parseable" do
+    erb_glob = Rails.root.join(
+      "app", "views", "**", "{*.htm,*.html,*.htm.erb,*.html.erb,*.html+*.erb}"
+    )
+
+    Dir[erb_glob].each do |filename|
+      data = File.read(filename)
+      expect { BetterHtml::BetterErb::ErubiImplementation.new(data).validate! }.not_to raise_exception
+    end
+  end
+end
+
+
 ```
 
 ## Working with the ERB parser