add better html and validation specs for erb

Gemfile

@@ -22,6 +22,7 @@ group :development do
   gem "web-console", "~> 4.2"
 end
 
+gem "better_html", "~> 1.0"
 gem "bootsnap", "~> 1.9", require: false
 gem "griddler-postmark", "~> 1.0", github: "r38y/griddler-postmark"
 gem "honeybadger", "~> 4.9"

Gemfile.lock

@@ -76,6 +76,14 @@ GEM
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     ast (2.4.2)
+    better_html (1.0.16)
+      actionview (>= 4.0)
+      activesupport (>= 4.0)
+      ast (~> 2.0)
+      erubi (~> 1.4)
+      html_tokenizer (~> 0.0.6)
+      parser (>= 2.4)
+      smart_properties
     bindex (0.8.1)
     bootsnap (1.9.4)
       msgpack (~> 1.0)
@@ -123,6 +131,7 @@ GEM
     hotwire-livereload (1.0.0)
       listen (>= 3.0.0)
       rails (>= 6.0.0)
+    html_tokenizer (0.0.7)
     htmlentities (4.3.4)
     i18n (1.8.11)
       concurrent-ruby (~> 1.0)
@@ -282,6 +291,7 @@ GEM
       rubocop (~> 1.19)
     ruby-progressbar (1.11.0)
     shellany (0.0.1)
+    smart_properties (1.17.0)
     sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -324,6 +334,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
+  better_html (~> 1.0)
   bootsnap (~> 1.9)
   bundler-audit (~> 0.9.0)
   debug (~> 1.4)

spec/views/view_validation_spec.rb

@@ -0,0 +1,24 @@
+require "rails_helper"
+require "better_html/test_helper/safe_erb_tester"
+
+RSpec.describe "view validation" do
+  include BetterHtml::TestHelper::SafeErbTester
+
+  erb_files = Rails.root.join("app", "views")
+    .glob("**/{*.htm,*.html,*.htm.erb,*.html.erb,*.html+*.erb}")
+
+  erb_files.each do |filename|
+    pathname = filename.relative_path_from(Rails.root)
+
+    describe pathname do
+      it "has no missing javascript escapes" do
+        assert_erb_safety File.read(filename)
+      end
+
+      it "has no html errors" do
+        data = File.read(filename)
+        BetterHtml::BetterErb::ErubiImplementation.new(data).validate!
+      end
+    end
+  end
+end