Add test for inline styles

Gemfile.lock

@@ -116,6 +116,13 @@ GEM
       public_suffix (>= 2.0.2, < 6.0)
     ast (2.4.2)
     base64 (0.2.0)
+    better_html (2.1.1)
+      actionview (>= 6.0)
+      activesupport (>= 6.0)
+      ast (~> 2.0)
+      erubi (~> 1.4)
+      parser (>= 2.4)
+      smart_properties
     bigdecimal (3.1.7)
     builder (3.2.4)
     concurrent-ruby (1.3.3)
@@ -301,6 +308,7 @@ GEM
       rack-protection (= 4.0.0)
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
+    smart_properties (1.17.0)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
@@ -345,6 +353,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
+  better_html
   capybara!
   debug
   mission_control-jobs!

mission_control-jobs.gemspec

@@ -33,6 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rubocop", "~> 1.52.0"
   spec.add_development_dependency "rubocop-performance"
   spec.add_development_dependency "rubocop-rails-omakase"
+  spec.add_development_dependency "better_html"
   spec.add_development_dependency "sprockets-rails"
   spec.add_development_dependency "sqlite3"
   spec.add_development_dependency "puma"

test/mission_control/erb_inline_styles_test.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require "test_helper"
+require "better_html"
+require "better_html/parser"
+require "better_html/tree/tag"
+
+class MissionControl::ErbInlineStylesTest < ActiveSupport::TestCase
+  ERB_GLOB = Rails.root.join(
+    "..", "..", "app", "views", "**", "{*.htm,*.html,*.htm.erb,*.html.erb,*.html+*.erb}"
+  )
+
+  Dir[ERB_GLOB].each do |filename|
+    pathname = Pathname.new(filename).relative_path_from(Rails.root)
+
+    test "No inline styles in /#{pathname.relative_path_from('../..')}" do
+      buffer = Parser::Source::Buffer.new("")
+      buffer.source = File.read(filename)
+      parser = BetterHtml::Parser.new(buffer)
+
+      parser.nodes_with_type(:tag).each do |tag_node|
+        tag = BetterHtml::Tree::Tag.from_node(tag_node)
+        assert_nil tag.attributes["style"]
+      end
+    end
+  end
+end