diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..bf43e61
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,22 @@
+name: Linter
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  check-changelog:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.0.0
+          bundler-cache: true
+      - name: Bundle install
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3 --path vendor/bundle
+      - name: Run Linter
+        run: bundle exec standardrb
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 1df7c2b..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,36 +0,0 @@
-language: ruby
-sudo: false
-
-before_install:
-  - gem update --system
-  - gem --version
-  - gem install bundler --no-document
-
-rvm:
-  - 2.4.6
-  - 2.5.5
-  - 2.6.5
-  - 2.7.0
-  - ruby-head
-
-gemfile:
-  - gemfiles/rails_5.gemfile
-  - gemfiles/rails_51.gemfile
-  - gemfiles/rails_52.gemfile
-  - gemfiles/rails_6.gemfile
-  - gemfiles/rails_head.gemfile
-
-matrix:
-  exclude:
-    - rvm: 2.3.8
-      gemfile: gemfiles/rails_6.gemfile
-    - rvm: 2.4.6
-      gemfile: gemfiles/rails_6.gemfile
-    - rvm: 2.3.8
-      gemfile: gemfiles/rails_head.gemfile
-    - rvm: 2.4.6
-      gemfile: gemfiles/rails_head.gemfile
-  allow_failures:
-    - rvm: ruby-head
-    - gemfile: gemfiles/rails_head.gemfile
-  fast_finish: true
diff --git a/Appraisals b/Appraisals
index c32c53f..8e87d6e 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,19 +1,19 @@
 appraise "rails_5_2" do
   gem "rails", "5.2.3"
   gem "sqlite3", "~> 1.4"
-  gem 'net-smtp', require: false
+  gem "net-smtp", require: false
 end
 
 appraise "rails_6_0" do
   gem "rails", "6.0.5"
   gem "sqlite3", "~> 1.4"
-  gem 'net-smtp', require: false
+  gem "net-smtp", require: false
 end
 
 appraise "rails_6_1" do
   gem "rails", "6.1.6"
   gem "sqlite3", "~> 1.4"
-  gem 'net-smtp', require: false
+  gem "net-smtp", require: false
 end
 
 appraise "rails_7_0" do
diff --git a/Rakefile b/Rakefile
index c8e57b9..09b2952 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,35 +1,33 @@
 begin
-  require 'bundler/setup'
+  require "bundler/setup"
 rescue LoadError
-  puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
+  puts "You must `gem install bundler` and `bundle install` to run rake tasks"
 end
 
-require 'rdoc/task'
+require "rdoc/task"
 
 RDoc::Task.new(:rdoc) do |rdoc|
-  rdoc.rdoc_dir = 'rdoc'
-  rdoc.title    = 'Maildown'
-  rdoc.options << '--line-numbers'
-  rdoc.rdoc_files.include('README.md')
-  rdoc.rdoc_files.include('lib/**/*.rb')
+  rdoc.rdoc_dir = "rdoc"
+  rdoc.title = "Maildown"
+  rdoc.options << "--line-numbers"
+  rdoc.rdoc_files.include("README.md")
+  rdoc.rdoc_files.include("lib/**/*.rb")
 end
 
 APP_RAKEFILE = File.expand_path("../test/dummy/Rakefile", __FILE__)
-load 'rails/tasks/engine.rake'
-
+load "rails/tasks/engine.rake"
 
 Bundler::GemHelper.install_tasks
 
-require 'rake/testtask'
+require "rake/testtask"
 
 Rake::TestTask.new(:test) do |t|
-  t.libs << 'lib'
-  t.libs << 'test'
-  t.pattern = 'test/**/*_test.rb'
+  t.libs << "lib"
+  t.libs << "test"
+  t.pattern = "test/**/*_test.rb"
   t.verbose = false
 end
 
-
 task default: :test
 
 require "bundler/gem_tasks"
diff --git a/lib/maildown.rb b/lib/maildown.rb
index e103058..c55fe92 100644
--- a/lib/maildown.rb
+++ b/lib/maildown.rb
@@ -1,7 +1,7 @@
 # Top level module, all module methods are used for configuration
 module Maildown
   @allow_indentations = false
-  @enable_layouts     = false
+  @enable_layouts = false
 
   def self.allow_indentation
     @allow_indentations
@@ -16,11 +16,11 @@ def self.rails_6?
   end
 end
 
-require 'maildown/markdown_engine'
+require "maildown/markdown_engine"
 ActiveSupport.on_load(:action_mailer) do
-  require 'maildown/ext/action_mailer'
+  require "maildown/ext/action_mailer"
 end
 ActiveSupport.on_load(:action_view) do
-  require 'maildown/ext/action_view'
+  require "maildown/ext/action_view"
 end
-require 'maildown/handlers/markdown'
+require "maildown/handlers/markdown"
diff --git a/lib/maildown/ext/action_mailer.rb b/lib/maildown/ext/action_mailer.rb
index cae3132..781b832 100644
--- a/lib/maildown/ext/action_mailer.rb
+++ b/lib/maildown/ext/action_mailer.rb
@@ -34,7 +34,7 @@
 # This monkeypatch detects when a markdown email is being
 # used and generates both a markdown and text template
 class ActionMailer::Base
-  alias :original_each_template :each_template
+  alias_method :original_each_template, :each_template
 
   def each_template(paths, name, &block)
     templates = original_each_template(paths, name, &block)
@@ -44,8 +44,8 @@ def each_template(paths, name, &block)
     html_template = templates.first
 
     # Cached template is already defined
-    if html_template.instance_variable_defined?(:"@maildown_text_template")
-      text_template = html_template.instance_variable_get(:"@maildown_text_template")
+    if html_template.instance_variable_defined?(:@maildown_text_template)
+      text_template = html_template.instance_variable_get(:@maildown_text_template)
       return [html_template, text_template]
     end
 
@@ -66,8 +66,8 @@ def each_template(paths, name, &block)
       text_template.formats = formats
     end
 
-    html_template.instance_variable_set(:"@maildown_text_template", text_template)
+    html_template.instance_variable_set(:@maildown_text_template, text_template)
 
-    return [html_template, text_template]
+    [html_template, text_template]
   end
 end
diff --git a/lib/maildown/ext/action_view.rb b/lib/maildown/ext/action_view.rb
index 375e2ab..5895151 100644
--- a/lib/maildown/ext/action_view.rb
+++ b/lib/maildown/ext/action_view.rb
@@ -19,17 +19,17 @@ def extract_handler_and_format_and_variant(template)
 # in addition to `.md+erb` and `.md`
 module ActionView
   class OptimizedFileSystemResolver
-    alias :original_extract_handler_and_format_and_variant :extract_handler_and_format_and_variant
+    alias_method :original_extract_handler_and_format_and_variant, :extract_handler_and_format_and_variant
 
     # Different versions of rails have different
     # method signatures here, path is always first
     def extract_handler_and_format_and_variant(*args)
-      if args.first.end_with?('md.erb')
+      if args.first.end_with?("md.erb")
         path = args.shift
-        path = path.gsub(/\.md\.erb\z/, '.md+erb')
+        path = path.gsub(/\.md\.erb\z/, ".md+erb")
         args.unshift(path)
       end
-      return original_extract_handler_and_format_and_variant(*args)
+      original_extract_handler_and_format_and_variant(*args)
     end
   end
 end
diff --git a/lib/maildown/handlers/markdown.rb b/lib/maildown/handlers/markdown.rb
index bd5a755..5a43e0e 100644
--- a/lib/maildown/handlers/markdown.rb
+++ b/lib/maildown/handlers/markdown.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
-require 'action_view'
+
+require "action_view"
 
 module Maildown
   module Handlers
@@ -32,7 +33,7 @@ def self.call(template, source = nil)
 
         # Match beginning whitespace but not newline
         # http://rubular.com/r/uCXQ58OOC8
-        source.gsub!(/^[^\S\n]+/, ''.freeze) if Maildown.allow_indentation
+        source.gsub!(/^[^\S\n]+/, "") if Maildown.allow_indentation
 
         if Maildown.rails_6?
           compiled_source = erb_handler.call(template, source)
@@ -55,7 +56,7 @@ def self.call(template, source = nil)
 # Allows for templates like `contact.md` or `contact.md+erb` to be rendered as
 # markdown.
 ActionView::Template.register_template_handler :"md+erb", Maildown::Handlers::Markdown
-ActionView::Template.register_template_handler :"md",     Maildown::Handlers::Markdown
+ActionView::Template.register_template_handler :md, Maildown::Handlers::Markdown
 
 # Used in conjunction with ext/action_view.rb monkey patch
 # to allow for using the ".md.erb" file "extension".
diff --git a/lib/maildown/markdown_engine.rb b/lib/maildown/markdown_engine.rb
index 7cc5354..73ede80 100644
--- a/lib/maildown/markdown_engine.rb
+++ b/lib/maildown/markdown_engine.rb
@@ -58,4 +58,4 @@ def self.default_text_block
   end
 end
 
-Maildown::MarkdownEngine.autoload(:"Kramdown", "kramdown")
+Maildown::MarkdownEngine.autoload(:Kramdown, "kramdown")
diff --git a/maildown.gemspec b/maildown.gemspec
index 38c567b..8fa7f9b 100644
--- a/maildown.gemspec
+++ b/maildown.gemspec
@@ -5,17 +5,16 @@ require "maildown/version"
 
 # Describe your gem and declare its dependencies:
 Gem::Specification.new do |s|
-  s.name        = "maildown"
-  s.version     = Maildown::VERSION
-  s.authors     = ["schneems"]
-  s.email       = ["richard.schneeman@gmail.com"]
-  s.homepage    = "https://www.github.com/schneems/maildown"
-  s.summary     = "Markdown in your mailbox"
+  s.name = "maildown"
+  s.version = Maildown::VERSION
+  s.authors = ["schneems"]
+  s.email = ["richard.schneeman@gmail.com"]
+  s.homepage = "https://www.github.com/schneems/maildown"
+  s.summary = "Markdown in your mailbox"
   s.description = "Best practice is to send text/plain && text/html markdown works great for both, so why write your templates twices?"
-  s.license     = "MIT"
+  s.license = "MIT"
 
   s.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.rdoc"]
-  s.test_files = Dir["test/**/*"]
 
   s.add_dependency "actionmailer", ">= 4.0.0"
   s.add_dependency "kramdown-parser-gfm"
@@ -24,4 +23,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency "m"
   s.add_development_dependency "sqlite3"
   s.add_development_dependency "rake"
+  s.add_development_dependency "standard"
 end
diff --git a/test/dummy/Rakefile b/test/dummy/Rakefile
index 4135d7a..292b11d 100644
--- a/test/dummy/Rakefile
+++ b/test/dummy/Rakefile
@@ -1,6 +1,6 @@
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 
-require File.expand_path('../config/application', __FILE__)
+require File.expand_path("../config/application", __FILE__)
 
 Dummy::Application.load_tasks
diff --git a/test/dummy/app/controllers/handlers_controller.rb b/test/dummy/app/controllers/handlers_controller.rb
index 84bc1cd..4cc7da4 100644
--- a/test/dummy/app/controllers/handlers_controller.rb
+++ b/test/dummy/app/controllers/handlers_controller.rb
@@ -1,5 +1,4 @@
 class HandlersController < ApplicationController
-
   def show
     render params[:id]
   end
diff --git a/test/dummy/app/mailers/application_mailer.rb b/test/dummy/app/mailers/application_mailer.rb
index 5af6723..bcf5760 100644
--- a/test/dummy/app/mailers/application_mailer.rb
+++ b/test/dummy/app/mailers/application_mailer.rb
@@ -1,4 +1,3 @@
 class ApplicationMailer < ActionMailer::Base
-  default from: 'from@example.com'
+  default from: "from@example.com"
 end
-
diff --git a/test/dummy/app/mailers/user_no_layout_mailer.rb b/test/dummy/app/mailers/user_no_layout_mailer.rb
index 7e45cfb..7ea8cfb 100644
--- a/test/dummy/app/mailers/user_no_layout_mailer.rb
+++ b/test/dummy/app/mailers/user_no_layout_mailer.rb
@@ -3,33 +3,33 @@ class UserNoLayoutMailer < ApplicationMailer
 
   def welcome
     mail(
-      to:       "foo@example.com",
+      to: "foo@example.com",
       reply_to: "noreply@schneems.com",
-      subject:  "hello world"
+      subject: "hello world"
     )
   end
 
   def leading_whitespace
     mail(
-      to:       "foo@example.com",
+      to: "foo@example.com",
       reply_to: "noreply@schneems.com",
-      subject:  "hello world"
+      subject: "hello world"
     )
   end
 
   def leading_whitespace_again
     mail(
-      to:       "foo@example.com",
+      to: "foo@example.com",
       reply_to: "noreply@schneems.com",
-      subject:  "hello world"
+      subject: "hello world"
     )
   end
 
   def contact
     mail(
-      to:       "foo@example.com",
+      to: "foo@example.com",
       reply_to: "noreply@schneems.com",
-      subject:  "hello world"
+      subject: "hello world"
     )
   end
 end
diff --git a/test/dummy/app/mailers/user_with_layout_mailer.rb b/test/dummy/app/mailers/user_with_layout_mailer.rb
index 8ef3499..2ec9c8b 100644
--- a/test/dummy/app/mailers/user_with_layout_mailer.rb
+++ b/test/dummy/app/mailers/user_with_layout_mailer.rb
@@ -3,9 +3,9 @@ class UserWithLayoutMailer < ApplicationMailer
 
   def welcome
     mail(
-      to:       "foo@example.com",
+      to: "foo@example.com",
       reply_to: "noreply@schneems.com",
-      subject:  "hello world"
+      subject: "hello world"
     )
   end
 end
diff --git a/test/dummy/bin/bundle b/test/dummy/bin/bundle
index 66e9889..fe18745 100755
--- a/test/dummy/bin/bundle
+++ b/test/dummy/bin/bundle
@@ -1,3 +1,3 @@
 #!/usr/bin/env ruby
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
-load Gem.bin_path('bundler', 'bundle')
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile", __FILE__)
+load Gem.bin_path("bundler", "bundle")
diff --git a/test/dummy/bin/rails b/test/dummy/bin/rails
index 728cd85..8b24567 100755
--- a/test/dummy/bin/rails
+++ b/test/dummy/bin/rails
@@ -1,4 +1,4 @@
 #!/usr/bin/env ruby
-APP_PATH = File.expand_path('../../config/application',  __FILE__)
-require_relative '../config/boot'
-require 'rails/commands'
+APP_PATH = File.expand_path("../../config/application", __FILE__)
+require_relative "../config/boot"
+require "rails/commands"
diff --git a/test/dummy/bin/rake b/test/dummy/bin/rake
index 1724048..4fbf10b 100755
--- a/test/dummy/bin/rake
+++ b/test/dummy/bin/rake
@@ -1,4 +1,4 @@
 #!/usr/bin/env ruby
-require_relative '../config/boot'
-require 'rake'
+require_relative "../config/boot"
+require "rake"
 Rake.application.run
diff --git a/test/dummy/config.ru b/test/dummy/config.ru
index 5bc2a61..193e5fe 100644
--- a/test/dummy/config.ru
+++ b/test/dummy/config.ru
@@ -1,4 +1,4 @@
 # This file is used by Rack-based servers to start the application.
 
-require ::File.expand_path('../config/environment',  __FILE__)
+require ::File.expand_path("../config/environment", __FILE__)
 run Rails.application
diff --git a/test/dummy/config/application.rb b/test/dummy/config/application.rb
index b558ab0..5efde28 100644
--- a/test/dummy/config/application.rb
+++ b/test/dummy/config/application.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../boot', __FILE__)
+require File.expand_path("../boot", __FILE__)
 
-require 'rails/all'
+require "rails/all"
 
 Bundler.require(*Rails.groups)
 require "maildown"
@@ -20,4 +20,3 @@ class Application < Rails::Application
     # config.i18n.default_locale = :de
   end
 end
-
diff --git a/test/dummy/config/boot.rb b/test/dummy/config/boot.rb
index 6266cfc..a66e6b4 100644
--- a/test/dummy/config/boot.rb
+++ b/test/dummy/config/boot.rb
@@ -1,5 +1,5 @@
 # Set up gems listed in the Gemfile.
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../../../Gemfile', __FILE__)
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../../../Gemfile", __FILE__)
 
-require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
-$LOAD_PATH.unshift File.expand_path('../../../../lib', __FILE__)
+require "bundler/setup" if File.exist?(ENV["BUNDLE_GEMFILE"])
+$LOAD_PATH.unshift File.expand_path("../../../../lib", __FILE__)
diff --git a/test/dummy/config/environment.rb b/test/dummy/config/environment.rb
index 10e0cad..1e9194e 100644
--- a/test/dummy/config/environment.rb
+++ b/test/dummy/config/environment.rb
@@ -1,5 +1,5 @@
 # Load the Rails application.
-require File.expand_path('../application', __FILE__)
+require File.expand_path("../application", __FILE__)
 
 # Initialize the Rails application.
 Dummy::Application.initialize!
diff --git a/test/dummy/config/environments/development.rb b/test/dummy/config/environments/development.rb
index 7201ec4..581fe39 100644
--- a/test/dummy/config/environments/development.rb
+++ b/test/dummy/config/environments/development.rb
@@ -10,7 +10,7 @@
   config.eager_load = false
 
   # Show full error reports and disable caching.
-  config.consider_all_requests_local       = true
+  config.consider_all_requests_local = true
   config.action_controller.perform_caching = false
 
   # Don't care if the mailer can't send.
diff --git a/test/dummy/config/environments/production.rb b/test/dummy/config/environments/production.rb
index b690b1c..9edbc79 100644
--- a/test/dummy/config/environments/production.rb
+++ b/test/dummy/config/environments/production.rb
@@ -11,7 +11,7 @@
   config.eager_load = true
 
   # Full error reports are disabled and caching is turned on.
-  config.consider_all_requests_local       = false
+  config.consider_all_requests_local = false
   config.action_controller.perform_caching = true
 
   # Enable Rack::Cache to put a simple HTTP cache in front of your application
@@ -33,7 +33,7 @@
   config.assets.digest = true
 
   # Version of your assets, change this if you want to expire all your assets.
-  config.assets.version = '1.0'
+  config.assets.version = "1.0"
 
   # Specifies the header that your server uses for sending files.
   # config.action_dispatch.x_sendfile_header = "X-Sendfile" # for apache
diff --git a/test/dummy/config/environments/test.rb b/test/dummy/config/environments/test.rb
index f907604..103c530 100644
--- a/test/dummy/config/environments/test.rb
+++ b/test/dummy/config/environments/test.rb
@@ -13,11 +13,11 @@
   config.eager_load = false
 
   # Configure static asset server for tests with Cache-Control for performance.
-  config.serve_static_assets  = true
-  config.public_file_server.headers = { 'Cache-Control' => 'public, max-age=3600' }
+  config.serve_static_assets = true
+  config.public_file_server.headers = {"Cache-Control" => "public, max-age=3600"}
 
   # Show full error reports and disable caching.
-  config.consider_all_requests_local       = true
+  config.consider_all_requests_local = true
   config.action_controller.perform_caching = false
 
   # Raise exceptions instead of rendering exception templates.
diff --git a/test/dummy/config/initializers/secret_token.rb b/test/dummy/config/initializers/secret_token.rb
index e68ab45..32202ce 100644
--- a/test/dummy/config/initializers/secret_token.rb
+++ b/test/dummy/config/initializers/secret_token.rb
@@ -9,4 +9,4 @@
 
 # Make sure your secret_key_base is kept private
 # if you're sharing your code publicly.
-Dummy::Application.config.secret_key_base = '302e49aee155f203d3391d98cae5401e28a931af85774ac884df3531396afb1eef9c35111a1e290a3b7a7ee274594c3dfc5c1cf21ab2557d1c870b2c447e968f'
+Dummy::Application.config.secret_key_base = "302e49aee155f203d3391d98cae5401e28a931af85774ac884df3531396afb1eef9c35111a1e290a3b7a7ee274594c3dfc5c1cf21ab2557d1c870b2c447e968f"
diff --git a/test/dummy/config/initializers/session_store.rb b/test/dummy/config/initializers/session_store.rb
index 155f7b0..e4995ac 100644
--- a/test/dummy/config/initializers/session_store.rb
+++ b/test/dummy/config/initializers/session_store.rb
@@ -1,3 +1,3 @@
 # Be sure to restart your server when you modify this file.
 
-Dummy::Application.config.session_store :cookie_store, key: '_dummy_session'
+Dummy::Application.config.session_store :cookie_store, key: "_dummy_session"
diff --git a/test/dummy/test/mailers/previews/user_no_layout_mailer_preview.rb b/test/dummy/test/mailers/previews/user_no_layout_mailer_preview.rb
index 31eafb9..05285ca 100644
--- a/test/dummy/test/mailers/previews/user_no_layout_mailer_preview.rb
+++ b/test/dummy/test/mailers/previews/user_no_layout_mailer_preview.rb
@@ -1,4 +1,3 @@
 # Preview all emails at http://localhost:3000/rails/mailers/user_no_layout_mailer
 class UserNoLayoutMailerPreview < ActionMailer::Preview
-
 end
diff --git a/test/dummy/test/mailers/previews/user_with_layout_mailer_preview.rb b/test/dummy/test/mailers/previews/user_with_layout_mailer_preview.rb
index f8054dc..06da897 100644
--- a/test/dummy/test/mailers/previews/user_with_layout_mailer_preview.rb
+++ b/test/dummy/test/mailers/previews/user_with_layout_mailer_preview.rb
@@ -1,4 +1,3 @@
 # Preview all emails at http://localhost:3000/rails/mailers/user_with_layout_mailer
 class UserWithLayoutMailerPreview < ActionMailer::Preview
-
 end
diff --git a/test/dummy/test/mailers/user_no_layout_mailer_test.rb b/test/dummy/test/mailers/user_no_layout_mailer_test.rb
index 5e51d48..d61360b 100644
--- a/test/dummy/test/mailers/user_no_layout_mailer_test.rb
+++ b/test/dummy/test/mailers/user_no_layout_mailer_test.rb
@@ -1,4 +1,4 @@
-require 'test_helper'
+require "test_helper"
 
 class UserNoLayoutMailerTest < ActionMailer::TestCase
   # test "the truth" do
diff --git a/test/dummy/test/mailers/user_with_layout_mailer_test.rb b/test/dummy/test/mailers/user_with_layout_mailer_test.rb
index 57fd46b..bd6708e 100644
--- a/test/dummy/test/mailers/user_with_layout_mailer_test.rb
+++ b/test/dummy/test/mailers/user_with_layout_mailer_test.rb
@@ -1,4 +1,4 @@
-require 'test_helper'
+require "test_helper"
 
 class UserWithLayoutMailerTest < ActionMailer::TestCase
   # test "the truth" do
diff --git a/test/integration/double_compile_test.rb b/test/integration/double_compile_test.rb
index 4c4bf02..3fc2821 100644
--- a/test/integration/double_compile_test.rb
+++ b/test/integration/double_compile_test.rb
@@ -1,26 +1,25 @@
-require 'test_helper'
+require "test_helper"
 
 class DoubleCompileTest < ActionMailer::TestCase
-
   def test_rendering_the_same_layout_twice_works
     email = UserNoLayoutMailer.welcome.deliver_now
     assert !ActionMailer::Base.deliveries.empty?
     # Test the body of the sent email contains what we expect it to
 
     body_contents = /<h2 id="welcome">Welcome!<\/h2>/
-    assert_match body_contents,       email.html_part.body.to_s
+    assert_match body_contents, email.html_part.body.to_s
 
     body_contents = /## Welcome!/
-    assert_match body_contents,       email.text_part.body.to_s
+    assert_match body_contents, email.text_part.body.to_s
 
     email = UserNoLayoutMailer.welcome.deliver_now
     assert !ActionMailer::Base.deliveries.empty?
     # Test the body of the sent email contains what we expect it to
 
     body_contents = /<h2 id="welcome">Welcome!<\/h2>/
-    assert_match body_contents,       email.html_part.body.to_s
+    assert_match body_contents, email.html_part.body.to_s
 
     body_contents = /## Welcome!/
-    assert_match body_contents,       email.text_part.body.to_s
+    assert_match body_contents, email.text_part.body.to_s
   end
-end
\ No newline at end of file
+end
diff --git a/test/integration/layouts_test.rb b/test/integration/layouts_test.rb
index 07458c2..4038d67 100644
--- a/test/integration/layouts_test.rb
+++ b/test/integration/layouts_test.rb
@@ -1,19 +1,18 @@
-require 'test_helper'
+require "test_helper"
 
 class LayoutsTest < ActionMailer::TestCase
-
   def test_no_layout
     email = UserNoLayoutMailer.welcome.deliver_now
     assert !ActionMailer::Base.deliveries.empty?
     # Test the body of the sent email contains what we expect it to
     assert_equal ["foo@example.com"], email.to
-    assert_equal "hello world",       email.subject
+    assert_equal "hello world", email.subject
 
     body_contents = /<h2 id="welcome">Welcome!<\/h2>/
-    assert_match body_contents,       email.html_part.body.to_s
+    assert_match body_contents, email.html_part.body.to_s
 
     body_contents = /## Welcome!/
-    assert_match body_contents,       email.text_part.body.to_s
+    assert_match body_contents, email.text_part.body.to_s
   end
 
   def test_layout_renders_fine
@@ -21,12 +20,12 @@ def test_layout_renders_fine
     assert !ActionMailer::Base.deliveries.empty?
     # Test the body of the sent email contains what we expect it to
     assert_equal ["foo@example.com"], email.to
-    assert_equal "hello world",       email.subject
+    assert_equal "hello world", email.subject
 
     body_contents = /HTML<h2 id="welcome">Welcome!<\/h2>/
-    assert_match body_contents,       email.html_part.body.to_s
+    assert_match body_contents, email.html_part.body.to_s
 
     body_contents = /TEXT## Welcome!/
-    assert_match body_contents,       email.text_part.body.to_s
+    assert_match body_contents, email.text_part.body.to_s
   end
 end
diff --git a/test/integration/strip_leading_whitespace_test.rb b/test/integration/strip_leading_whitespace_test.rb
index f5c8791..9f3f878 100644
--- a/test/integration/strip_leading_whitespace_test.rb
+++ b/test/integration/strip_leading_whitespace_test.rb
@@ -1,4 +1,4 @@
-require 'test_helper'
+require "test_helper"
 
 class TemplateHandlerTest < ActionDispatch::IntegrationTest
   def test_strip_whitespace_templates
@@ -12,7 +12,7 @@ def test_strip_whitespace_templates
     assert_equal "## Leading\n", email.text_part.body.to_s
 
     assert_equal "text/html", email.html_part.mime_type
-    assert_equal %Q{<h2 id="leading">Leading</h2>\n}, email.html_part.body.to_s
+    assert_equal %(<h2 id="leading">Leading</h2>\n), email.html_part.body.to_s
   ensure
     Maildown.allow_indentation = false
   end
diff --git a/test/integration/template_handler_test.rb b/test/integration/template_handler_test.rb
index 62b6c4d..7f48064 100644
--- a/test/integration/template_handler_test.rb
+++ b/test/integration/template_handler_test.rb
@@ -1,4 +1,4 @@
-require 'test_helper'
+require "test_helper"
 
 class TemplateHandlerTest < ActionDispatch::IntegrationTest
   test ".md template handler" do
diff --git a/test/test_helper.rb b/test/test_helper.rb
index fdcad47..9cff5c3 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,7 +1,7 @@
 # Configure Rails Environment
 ENV["RAILS_ENV"] = "test"
 
-require File.expand_path("../dummy/config/environment.rb",  __FILE__)
+require File.expand_path("../dummy/config/environment.rb", __FILE__)
 require "rails/test_help"
 require "kramdown-parser-gfm"
 
diff --git a/test/unit/ext_action_mailer_test.rb b/test/unit/ext_action_mailer_test.rb
index 4dc1402..2e146d8 100644
--- a/test/unit/ext_action_mailer_test.rb
+++ b/test/unit/ext_action_mailer_test.rb
@@ -1,10 +1,9 @@
-require 'test_helper'
+require "test_helper"
 
 class ExtActionMailerTest < ActiveSupport::TestCase
-
   test "monkeypatch location" do
     monkeypatch = ActionMailer::Base.instance_method(:each_template)
-    path        = monkeypatch.source_location.first
+    path = monkeypatch.source_location.first
     assert_match "maildown/ext/action_mailer.rb", path
   end
 end
diff --git a/test/unit/markdown_engine_test.rb b/test/unit/markdown_engine_test.rb
index 6f52d11..3db4e27 100644
--- a/test/unit/markdown_engine_test.rb
+++ b/test/unit/markdown_engine_test.rb
@@ -1,7 +1,6 @@
-require 'test_helper'
+require "test_helper"
 
 class MarkdownEngineTest < ActiveSupport::TestCase
-
   def setup
     @default_setup = Maildown::MarkdownEngine.html_block
   end