Enforce rubocop rules for 2.0

.rubocop.yml

@@ -1,7 +1,7 @@
 # Please keep AllCops, Bundler, Style, Metrics groups and then order cops
 # alphabetically
 inherit_from:
-  - https://raw.githubusercontent.com/hanami/devtools/master/.rubocop.yml
+  - https://raw.githubusercontent.com/hanami/devtools/master/.rubocop-unstable.yml
 Style/Documentation:
   Exclude:
     - "examples/*"

Gemfile

@@ -1,14 +1,16 @@
-source 'https://rubygems.org'
+# frozen_string_literal: true
+
+source "https://rubygems.org"
 gemspec
 
-unless ENV['TRAVIS']
-  gem 'byebug',           require: false, platforms: :mri
-  gem 'allocation_stats', require: false
-  gem 'benchmark-ips',    require: false
+unless ENV["TRAVIS"]
+  gem "byebug",           require: false, platforms: :mri
+  gem "allocation_stats", require: false
+  gem "benchmark-ips",    require: false
 end
 
-gem 'hanami-utils', '2.0.0.alpha1', require: false, git: 'https://github.com/hanami/utils.git', branch: 'unstable'
-gem 'haml'
+gem "hanami-utils", "2.0.0.alpha1", require: false, git: "https://github.com/hanami/utils.git", branch: "unstable"
+gem "haml"
 
-gem 'hanami-devtools', require: false, git: 'https://github.com/hanami/devtools.git'
-gem 'coveralls', require: false
+gem "hanami-devtools", require: false, git: "https://github.com/hanami/devtools.git"
+gem "coveralls", require: false

Rakefile

@@ -1,19 +1,21 @@
-require 'rake'
-require 'bundler/gem_tasks'
-require 'rspec/core/rake_task'
+# frozen_string_literal: true
+
+require "rake"
+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
 
 namespace :spec do
   RSpec::Core::RakeTask.new(:unit) do |task|
-    file_list = FileList['spec/**/*_spec.rb']
+    file_list = FileList["spec/**/*_spec.rb"]
     file_list = file_list.exclude("spec/{integration,isolation}/**/*_spec.rb")
 
     task.pattern = file_list
   end
 
   task :coverage do
-    ENV['COVERAGE'] = 'true'
-    Rake::Task['spec:unit'].invoke
+    ENV["COVERAGE"] = "true"
+    Rake::Task["spec:unit"].invoke
   end
 end
 
-task default: 'spec:unit'
+task default: "spec:unit"

benchmark.rb

@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
-require 'bundler/setup'
-require 'hanami/mailer'
-require 'benchmark/ips'
-require 'allocation_stats'
-require_relative './examples/base'
+require "bundler/setup"
+require "hanami/mailer"
+require "benchmark/ips"
+require "allocation_stats"
+require_relative "./examples/base"
 
 configuration = Hanami::Mailer::Configuration.new do |config|
   config.root            = "examples/base"
@@ -44,5 +44,5 @@ detailed_allocations = stats.allocations(alias_paths: true)
                             .sort_by_count
                             .to_text
 
-puts 'allocations by source file and class:'
+puts "allocations by source file and class:"
 puts detailed_allocations

bin/console

@@ -1,7 +1,8 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
-require 'bundler/setup'
-require 'hanami/mailer'
+require "bundler/setup"
+require "hanami/mailer"
 
 # You can add fixtures and/or initialization code here to make experimenting
 # with your gem easier. You can also use a different console, if you like.
@@ -10,5 +11,5 @@ require 'hanami/mailer'
 # require "pry"
 # Pry.start
 
-require 'irb'
+require "irb"
 IRB.start

examples/base.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
-require 'bundler/setup'
-require 'hanami/mailer'
+require "bundler/setup"
+require "hanami/mailer"
 
 configuration = Hanami::Mailer::Configuration.new do |config|
   config.root            = File.expand_path(__dir__, "base")

hanami-mailer.gemspec

@@ -1,29 +1,31 @@
-lib = File.expand_path('../lib', __FILE__)
+# frozen_string_literal: true
+
+lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'hanami/mailer/version'
+require "hanami/mailer/version"
 
 Gem::Specification.new do |spec|
-  spec.name          = 'hanami-mailer'
+  spec.name          = "hanami-mailer"
   spec.version       = Hanami::Mailer::VERSION
-  spec.authors       = ['Luca Guidi']
-  spec.email         = ['me@lucaguidi.com']
+  spec.authors       = ["Luca Guidi"]
+  spec.email         = ["me@lucaguidi.com"]
 
-  spec.summary       = 'Mail for Ruby applications.'
-  spec.description   = 'Mail for Ruby applications and Hanami mailers'
-  spec.homepage      = 'http://hanamirb.org'
-  spec.license       = 'MIT'
+  spec.summary       = "Mail for Ruby applications."
+  spec.description   = "Mail for Ruby applications and Hanami mailers"
+  spec.homepage      = "http://hanamirb.org"
+  spec.license       = "MIT"
 
   spec.files         = `git ls-files -- lib/* CHANGELOG.md LICENSE.md README.md hanami-mailer.gemspec`.split($/) # rubocop:disable Style/SpecialGlobalVars
-  spec.bindir        = 'exe'
+  spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
-  spec.require_paths = ['lib']
-  spec.required_ruby_version = '>= 2.3.0'
+  spec.require_paths = ["lib"]
+  spec.required_ruby_version = ">= 2.3.0"
 
-  spec.add_dependency 'hanami-utils', '2.0.0.alpha1'
-  spec.add_dependency 'tilt',         '~> 2.0', '>= 2.0.1'
-  spec.add_dependency 'mail',         '~> 2.6'
+  spec.add_dependency "hanami-utils", "2.0.0.alpha1"
+  spec.add_dependency "tilt",         "~> 2.0", ">= 2.0.1"
+  spec.add_dependency "mail",         "~> 2.6"
 
-  spec.add_development_dependency 'bundler', '~> 1.15'
-  spec.add_development_dependency 'rake',    '~> 12'
-  spec.add_development_dependency 'rspec',   '~> 3.7'
+  spec.add_development_dependency "bundler", "~> 1.15"
+  spec.add_development_dependency "rake",    "~> 12"
+  spec.add_development_dependency "rspec",   "~> 3.7"
 end

lib/hanami/mailer.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
-require 'mail'
-require 'concurrent'
+require "mail"
+require "concurrent"
 
 # Hanami
 #
@@ -11,19 +11,19 @@ module Hanami
   #
   # @since 0.1.0
   class Mailer
-    require 'hanami/mailer/version'
-    require 'hanami/mailer/template'
-    require 'hanami/mailer/finalizer'
-    require 'hanami/mailer/configuration'
-    require 'hanami/mailer/dsl'
+    require "hanami/mailer/version"
+    require "hanami/mailer/template"
+    require "hanami/mailer/finalizer"
+    require "hanami/mailer/configuration"
+    require "hanami/mailer/dsl"
 
     # Content types mapping
     #
     # @since 0.1.0
     # @api private
     CONTENT_TYPES = {
-      html: 'text/html',
-      txt:  'text/plain'
+      html: "text/html",
+      txt:  "text/plain"
     }.freeze
 
     private_constant(:CONTENT_TYPES)

lib/hanami/mailer/configuration.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
-require 'hanami/utils/kernel'
-require 'hanami/mailer/template_name'
-require 'hanami/mailer/templates_finder'
+require "hanami/utils/kernel"
+require "hanami/mailer/template_name"
+require "hanami/mailer/templates_finder"
 
 module Hanami
   class Mailer
@@ -14,7 +14,7 @@ module Hanami
       #
       # @since 0.1.0
       # @api private
-      DEFAULT_ROOT = '.'
+      DEFAULT_ROOT = "."
 
       # Default delivery method
       #
@@ -26,7 +26,7 @@ module Hanami
       #
       # @since 0.1.0
       # @api private
-      DEFAULT_CHARSET = 'UTF-8'
+      DEFAULT_CHARSET = "UTF-8"
 
       private_constant(*constants(false))
 
@@ -117,7 +117,7 @@ module Hanami
       #
       # @see Hanami::Mailer.configure
       def prepare(&blk)
-        raise ArgumentError.new('Please provide a block') unless block_given?
+        raise ArgumentError.new("Please provide a block") unless block_given?
         @modules.push(blk)
       end
 

lib/hanami/mailer/dsl.rb

@@ -5,7 +5,7 @@ module Hanami
   #
   # @since 0.1.0
   class Mailer
-    require 'hanami/mailer/template_name'
+    require "hanami/mailer/template_name"
 
     # Class level DSL
     #

lib/hanami/mailer/finalizer.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'mail'
+require "mail"
 # require 'ice_nine'
 
 module Hanami

lib/hanami/mailer/template.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'tilt'
+require "tilt"
 
 module Hanami
   class Mailer

lib/hanami/mailer/template_name.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'hanami/utils/string'
+require "hanami/utils/string"
 
 module Hanami
   class Mailer
@@ -12,7 +12,7 @@ module Hanami
       # @since next
       # @api unstable
       def self.call(name, namespace)
-        Utils::String.new(name.gsub(/\A#{namespace}(::)*/, '')).underscore.to_s
+        Utils::String.new(name.gsub(/\A#{namespace}(::)*/, "")).underscore.to_s
       end
 
       class << self

lib/hanami/mailer/templates_finder.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
-require 'hanami/mailer/template'
-require 'hanami/utils/file_list'
-require 'pathname'
+require "hanami/mailer/template"
+require "hanami/utils/file_list"
+require "pathname"
 
 module Hanami
   class Mailer
@@ -17,19 +17,19 @@ module Hanami
       #
       # @api private
       # @since 0.1.0
-      FORMAT    = '*'
+      FORMAT    = "*"
 
       # Default template engines
       #
       # @api private
       # @since 0.1.0
-      ENGINES   = '*'
+      ENGINES   = "*"
 
       # Recursive pattern
       #
       # @api private
       # @since 0.1.0
-      RECURSIVE = '**'
+      RECURSIVE = "**"
 
       # Format separator
       #
@@ -38,7 +38,7 @@ module Hanami
       #
       # @example
       #   welcome.html.erb
-      FORMAT_SEPARATOR = '.'
+      FORMAT_SEPARATOR = "."
 
       private_constant(*constants(true))
 

lib/hanami/mailer/version.rb

@@ -3,6 +3,6 @@
 module Hanami
   class Mailer
     # @since 0.1.0
-    VERSION = '1.1.0'
+    VERSION = "1.1.0"
   end
 end

spec/integration/hanami/mailer/delivery_spec.rb

@@ -1,9 +1,9 @@
 # frozen_string_literal: true
 
 RSpec.describe Hanami::Mailer do
-  describe '.deliver' do
-    it 'can deliver with specified charset' do
-      mail = CharsetMailer.new(configuration: configuration).deliver(charset: charset = 'iso-2022-jp')
+  describe ".deliver" do
+    it "can deliver with specified charset" do
+      mail = CharsetMailer.new(configuration: configuration).deliver(charset: charset = "iso-2022-jp")
 
       expect(mail.charset).to             eq(charset)
       expect(mail.parts.first.charset).to eq(charset)
@@ -17,24 +17,24 @@ RSpec.describe Hanami::Mailer do
       expect { MissingToMailer.new(configuration: configuration).deliver({}) }.to raise_error(Hanami::Mailer::MissingDeliveryDataError)
     end
 
-    describe 'test delivery with hardcoded values' do
+    describe "test delivery with hardcoded values" do
       subject { WelcomeMailer.new(configuration: configuration).deliver({}) }
 
-      it 'sends the correct information' do
-        expect(subject.from).to    eq(['noreply@sender.com'])
-        expect(subject.to).to      eq(['noreply@recipient.com', 'owner@recipient.com'])
-        expect(subject.cc).to      eq(['cc@recipient.com'])
-        expect(subject.bcc).to     eq(['bcc@recipient.com'])
-        expect(subject.subject).to eq('Welcome')
+      it "sends the correct information" do
+        expect(subject.from).to    eq(["noreply@sender.com"])
+        expect(subject.to).to      eq(["noreply@recipient.com", "owner@recipient.com"])
+        expect(subject.cc).to      eq(["cc@recipient.com"])
+        expect(subject.bcc).to     eq(["bcc@recipient.com"])
+        expect(subject.subject).to eq("Welcome")
       end
 
-      it 'has the correct templates' do
+      it "has the correct templates" do
         expect(subject.html_part.to_s).to include(%(template))
         expect(subject.text_part.to_s).to include(%(template))
       end
 
-      it 'interprets the prepare statement' do
-        attachment = subject.attachments['invoice.pdf']
+      it "interprets the prepare statement" do
+        attachment = subject.attachments["invoice.pdf"]
 
         expect(attachment).to be_kind_of(Mail::Part)
 
@@ -42,29 +42,29 @@ RSpec.describe Hanami::Mailer do
         expect(attachment).to_not be_inline
         expect(attachment).to_not be_multipart
 
-        expect(attachment.filename).to eq('invoice.pdf')
+        expect(attachment.filename).to eq("invoice.pdf")
 
-        expect(attachment.content_type).to match('application/pdf')
-        expect(attachment.content_type).to match('filename=invoice.pdf')
+        expect(attachment.content_type).to match("application/pdf")
+        expect(attachment.content_type).to match("filename=invoice.pdf")
       end
     end
 
-    describe 'test delivery with procs' do
+    describe "test delivery with procs" do
       subject { ProcMailer.new(configuration: configuration).deliver(user: user) }
-      let(:user) { User.new('Name', 'student@deigirls.com') }
+      let(:user) { User.new("Name", "student@deigirls.com") }
 
-      it 'sends the correct information' do
+      it "sends the correct information" do
         expect(subject.from).to    eq(["hello-#{user.name.downcase}@example.com"])
         expect(subject.to).to      eq([user.email])
         expect(subject.subject).to eq("[Hanami] Hello, #{user.name}")
       end
     end
 
-    describe 'test delivery with locals' do
+    describe "test delivery with locals" do
       subject     { EventMailer.new(configuration: configuration) }
       let(:count) { 100 }
 
-      it 'delivers the message' do
+      it "delivers the message" do
         threads = []
         mails   = {}
 
@@ -87,8 +87,8 @@ RSpec.describe Hanami::Mailer do
       end
     end
 
-    describe 'multipart' do
-      it 'delivers all the parts by default' do
+    describe "multipart" do
+      it "delivers all the parts by default" do
         mail = WelcomeMailer.new(configuration: configuration).deliver({})
         body = mail.body.encoded
 
@@ -96,7 +96,7 @@ RSpec.describe Hanami::Mailer do
         expect(body).to include(%(This is a txt template))
       end
 
-      it 'can deliver only the text part' do
+      it "can deliver only the text part" do
         mail = WelcomeMailer.new(configuration: configuration).deliver(format: :txt)
         body = mail.body.encoded
 
@@ -104,7 +104,7 @@ RSpec.describe Hanami::Mailer do
         expect(body).to     include(%(This is a txt template))
       end
 
-      it 'can deliver only the html part' do
+      it "can deliver only the html part" do
         mail = WelcomeMailer.new(configuration: configuration).deliver(format: :html)
         body = mail.body.encoded
 
@@ -113,7 +113,7 @@ RSpec.describe Hanami::Mailer do
       end
     end
 
-    describe 'custom delivery' do
+    describe "custom delivery" do
       before do
         mailer.deliver({})
       end
@@ -124,30 +124,30 @@ RSpec.describe Hanami::Mailer do
 
       let(:configuration) do
         configuration = Hanami::Mailer::Configuration.new do |config|
-          config.root            = 'spec/support/fixtures'
+          config.root            = "spec/support/fixtures"
           config.delivery_method = MandrillDeliveryMethod, options
         end
 
         Hanami::Mailer.finalize(configuration)
       end
 
-      it 'delivers the mail' do
+      it "delivers the mail" do
         expect(options.fetch(:deliveries).size).to be(1)
       end
 
-      it 'sends the correct information' do
-        expect(subject.from).to    eq(['noreply@sender.com'])
-        expect(subject.to).to      eq(['noreply@recipient.com', 'owner@recipient.com'])
+      it "sends the correct information" do
+        expect(subject.from).to    eq(["noreply@sender.com"])
+        expect(subject.to).to      eq(["noreply@recipient.com", "owner@recipient.com"])
         expect(subject.subject).to eq("Welcome")
       end
 
-      it 'has the correct templates' do
+      it "has the correct templates" do
         expect(subject.html_part.to_s).to include(%(template))
         expect(subject.text_part.to_s).to include(%(template))
       end
 
-      it 'runs the before callback' do
-        expect(subject.attachments['invoice.pdf']).to_not be(nil)
+      it "runs the before callback" do
+        expect(subject.attachments["invoice.pdf"]).to_not be(nil)
       end
     end
   end

spec/spec_helper.rb

@@ -16,7 +16,7 @@ RSpec.configure do |config|
 
   config.warnings = true
 
-  config.default_formatter = 'doc' if config.files_to_run.one?
+  config.default_formatter = "doc" if config.files_to_run.one?
 
   config.profile_examples = 10
 
@@ -24,9 +24,9 @@ RSpec.configure do |config|
   Kernel.srand config.seed
 end
 
-require 'ostruct'
-require 'hanami/utils'
+require "ostruct"
+require "hanami/utils"
 
-$LOAD_PATH.unshift 'lib'
-require 'hanami/mailer'
+$LOAD_PATH.unshift "lib"
+require "hanami/mailer"
 Hanami::Utils.require!("spec/support")

spec/support/context.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RSpec
   module Support
     module Context
@@ -5,7 +7,7 @@ module RSpec
         base.class_eval do
           let(:configuration) do
             configuration = Hanami::Mailer::Configuration.new do |config|
-              config.root            = 'spec/support/fixtures'
+              config.root            = "spec/support/fixtures"
               config.delivery_method = :test
             end
 

spec/support/fixtures.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class InvoiceMailer < Hanami::Mailer
-  template 'invoice'
+  template "invoice"
 end
 
 class RenderMailer < Hanami::Mailer
@@ -11,39 +11,39 @@ class TemplateEngineMailer < Hanami::Mailer
 end
 
 class CharsetMailer < Hanami::Mailer
-  from    'noreply@example.com'
-  to      'user@example.com'
-  subject 'こんにちは'
+  from    "noreply@example.com"
+  to      "user@example.com"
+  subject "こんにちは"
 end
 
 class MissingFromMailer < Hanami::Mailer
-  template 'missing'
+  template "missing"
 
-  to      'recipient@example.com'
-  subject 'Hello'
+  to      "recipient@example.com"
+  subject "Hello"
 end
 
 class MissingToMailer < Hanami::Mailer
-  template 'missing'
+  template "missing"
 
-  from    'sender@example.com'
-  subject 'Hello'
+  from    "sender@example.com"
+  subject "Hello"
 end
 
 class CcOnlyMailer < Hanami::Mailer
-  template 'missing'
+  template "missing"
 
-  cc      'recipient@example.com'
-  from    'sender@example.com'
-  subject 'Hello'
+  cc      "recipient@example.com"
+  from    "sender@example.com"
+  subject "Hello"
 end
 
 class BccOnlyMailer < Hanami::Mailer
-  template 'missing'
+  template "missing"
 
-  bcc      'recipient@example.com'
-  from    'sender@example.com'
-  subject 'Hello'
+  bcc      "recipient@example.com"
+  from    "sender@example.com"
+  subject "Hello"
 end
 
 User = Struct.new(:name, :email)
@@ -62,19 +62,19 @@ class ProcMailer < Hanami::Mailer
 end
 
 class WelcomeMailer < Hanami::Mailer
-  from 'noreply@sender.com'
-  to   ['noreply@recipient.com', 'owner@recipient.com']
-  cc   'cc@recipient.com'
-  bcc  'bcc@recipient.com'
+  from "noreply@sender.com"
+  to   ["noreply@recipient.com", "owner@recipient.com"]
+  cc   "cc@recipient.com"
+  bcc  "bcc@recipient.com"
 
-  subject 'Welcome'
+  subject "Welcome"
 
   before do |mail|
-    mail.attachments['invoice.pdf'] = "/path/to/invoice-#{invoice_code}.pdf"
+    mail.attachments["invoice.pdf"] = "/path/to/invoice-#{invoice_code}.pdf"
   end
 
   def greeting
-    'Ahoy'
+    "Ahoy"
   end
 
   def invoice_code
@@ -83,7 +83,7 @@ class WelcomeMailer < Hanami::Mailer
 end
 
 class EventMailer < Hanami::Mailer
-  from    'events@domain.test'
+  from    "events@domain.test"
   to      ->(locals) { locals.fetch(:user).email }
   subject ->(locals) { "Invitation: #{locals.fetch(:event).title}" }
 
@@ -124,6 +124,6 @@ end
 
 module DefaultSubject
   def self.included(mailer)
-    mailer.subject 'default subject'
+    mailer.subject "default subject"
   end
 end

spec/unit/hanami/mailer/configuration_spec.rb

@@ -3,23 +3,23 @@
 RSpec.describe Hanami::Mailer::Configuration do
   subject { described_class.new }
 
-  describe '#root=' do
-    describe 'when a value is given' do
-      describe 'and it is a string' do
-        it 'sets it as a Pathname' do
-          subject.root = 'spec'
-          expect(subject.root).to eq(Pathname.new('spec').realpath)
+  describe "#root=" do
+    describe "when a value is given" do
+      describe "and it is a string" do
+        it "sets it as a Pathname" do
+          subject.root = "spec"
+          expect(subject.root).to eq(Pathname.new("spec").realpath)
         end
       end
 
-      describe 'and it is a pathname' do
-        it 'sets it' do
-          subject.root = Pathname.new('spec')
-          expect(subject.root).to eq(Pathname.new('spec').realpath)
+      describe "and it is a pathname" do
+        it "sets it" do
+          subject.root = Pathname.new("spec")
+          expect(subject.root).to eq(Pathname.new("spec").realpath)
         end
       end
 
-      describe 'and it implements #to_pathname' do
+      describe "and it implements #to_pathname" do
         before do
           RootPath = Struct.new(:path) do
             def to_pathname
@@ -32,71 +32,71 @@ RSpec.describe Hanami::Mailer::Configuration do
           Object.send(:remove_const, :RootPath)
         end
 
-        it 'sets the converted value' do
-          subject.root = RootPath.new('spec')
-          expect(subject.root).to eq(Pathname.new('spec').realpath)
+        it "sets the converted value" do
+          subject.root = RootPath.new("spec")
+          expect(subject.root).to eq(Pathname.new("spec").realpath)
         end
       end
 
-      describe 'and it is an unexisting path' do
-        it 'raises an error' do
+      describe "and it is an unexisting path" do
+        it "raises an error" do
           expect do
-            subject.root = '/path/to/unknown'
+            subject.root = "/path/to/unknown"
           end.to raise_error(Errno::ENOENT)
         end
       end
     end
 
-    describe 'when a value is not given' do
-      it 'defaults to the current path' do
-        expect(subject.root).to eq(Pathname.new('.').realpath)
+    describe "when a value is not given" do
+      it "defaults to the current path" do
+        expect(subject.root).to eq(Pathname.new(".").realpath)
       end
     end
   end
 
-  describe '#delivery_method' do
-    describe 'when not previously set' do
-      it 'defaults to SMTP' do
+  describe "#delivery_method" do
+    describe "when not previously set" do
+      it "defaults to SMTP" do
         expect(subject.delivery_method).to eq(:smtp)
       end
     end
 
-    describe 'set with a symbol' do
+    describe "set with a symbol" do
       before do
-        subject.delivery_method = :exim, { location: '/path/to/exim' }
+        subject.delivery_method = :exim, { location: "/path/to/exim" }
       end
 
-      it 'saves the delivery method in the configuration' do
-        expect(subject.delivery_method).to eq([:exim, { location: '/path/to/exim' }])
+      it "saves the delivery method in the configuration" do
+        expect(subject.delivery_method).to eq([:exim, { location: "/path/to/exim" }])
       end
     end
 
-    describe 'set with a class' do
+    describe "set with a class" do
       before do
         subject.delivery_method = MandrillDeliveryMethod,
-                                  { username: 'mandrill-username', password: 'mandrill-api-key' }
+                                  { username: "mandrill-username", password: "mandrill-api-key" }
       end
 
-      it 'saves the delivery method in the configuration' do
-        expect(subject.delivery_method).to eq([MandrillDeliveryMethod, username: 'mandrill-username', password: 'mandrill-api-key'])
+      it "saves the delivery method in the configuration" do
+        expect(subject.delivery_method).to eq([MandrillDeliveryMethod, username: "mandrill-username", password: "mandrill-api-key"])
       end
     end
   end
 
-  describe '#default_charset' do
-    describe 'when not previously set' do
-      it 'defaults to UTF-8' do
-        expect(subject.default_charset).to eq('UTF-8')
+  describe "#default_charset" do
+    describe "when not previously set" do
+      it "defaults to UTF-8" do
+        expect(subject.default_charset).to eq("UTF-8")
       end
     end
 
-    describe 'when set' do
+    describe "when set" do
       before do
-        subject.default_charset = 'iso-8859-1'
+        subject.default_charset = "iso-8859-1"
       end
 
-      it 'saves the delivery method in the configuration' do
-        expect(subject.default_charset).to eq('iso-8859-1')
+      it "saves the delivery method in the configuration" do
+        expect(subject.default_charset).to eq("iso-8859-1")
       end
     end
   end

spec/unit/hanami/mailer/dsl_spec.rb

@@ -3,117 +3,117 @@
 RSpec.describe Hanami::Mailer::Dsl do
   let(:mailer) { Class.new { extend Hanami::Mailer::Dsl } }
 
-  describe '.from' do
-    it 'returns the default value' do
+  describe ".from" do
+    it "returns the default value" do
       expect(mailer.from).to be(nil)
     end
 
-    it 'sets the value' do
-      sender = 'sender@hanami.test'
+    it "sets the value" do
+      sender = "sender@hanami.test"
       mailer.from sender
 
       expect(mailer.from).to eq(sender)
     end
   end
 
-  describe '.to' do
-    it 'returns the default value' do
+  describe ".to" do
+    it "returns the default value" do
       expect(mailer.to).to be(nil)
     end
 
-    it 'sets a single value' do
-      recipient = 'recipient@hanami.test'
+    it "sets a single value" do
+      recipient = "recipient@hanami.test"
       mailer.to recipient
 
       expect(mailer.to).to eq(recipient)
     end
 
-    it 'sets an array of values' do
-      recipients = ['recipient@hanami.test']
+    it "sets an array of values" do
+      recipients = ["recipient@hanami.test"]
       mailer.to recipients
 
       expect(mailer.to).to eq(recipients)
     end
   end
 
-  describe '.cc' do
-    it 'returns the default value' do
+  describe ".cc" do
+    it "returns the default value" do
       expect(mailer.cc).to be(nil)
     end
 
-    it 'sets a single value' do
-      recipient = 'cc@hanami.test'
+    it "sets a single value" do
+      recipient = "cc@hanami.test"
       mailer.cc recipient
 
       expect(mailer.cc).to eq(recipient)
     end
 
-    it 'sets an array of values' do
-      recipients = ['cc@hanami.test']
+    it "sets an array of values" do
+      recipients = ["cc@hanami.test"]
       mailer.cc recipients
 
       expect(mailer.cc).to eq(recipients)
     end
   end
 
-  describe '.bcc' do
-    it 'returns the default value' do
+  describe ".bcc" do
+    it "returns the default value" do
       expect(mailer.bcc).to be(nil)
     end
 
-    it 'sets a single value' do
-      recipient = 'bcc@hanami.test'
+    it "sets a single value" do
+      recipient = "bcc@hanami.test"
       mailer.bcc recipient
 
       expect(mailer.bcc).to eq(recipient)
     end
 
-    it 'sets an array of values' do
-      recipients = ['bcc@hanami.test']
+    it "sets an array of values" do
+      recipients = ["bcc@hanami.test"]
       mailer.bcc recipients
 
       expect(mailer.bcc).to eq(recipients)
     end
   end
 
-  describe '.subject' do
-    it 'returns the default value' do
+  describe ".subject" do
+    it "returns the default value" do
       expect(mailer.subject).to be(nil)
     end
 
-    it 'sets a value' do
-      mail_subject = 'Hello'
+    it "sets a value" do
+      mail_subject = "Hello"
       mailer.subject mail_subject
 
       expect(mailer.subject).to eq(mail_subject)
     end
   end
 
-  describe '.template' do
-    it 'sets a value' do
-      mailer.template 'file'
+  describe ".template" do
+    it "sets a value" do
+      mailer.template "file"
     end
   end
 
-  describe '.template_name' do
-    it 'returns the default value' do
+  describe ".template_name" do
+    it "returns the default value" do
       expect(mailer.template_name).to be(nil)
     end
 
-    it 'returns value, if set' do
-      template = 'file'
+    it "returns value, if set" do
+      template = "file"
       mailer.template template
 
       expect(mailer.template_name).to eq(template)
     end
   end
 
-  describe '.before' do
-    it 'returns the default value' do
+  describe ".before" do
+    it "returns the default value" do
       expect(mailer.before).to be_kind_of(Proc)
     end
 
-    it 'sets a value' do
+    it "sets a value" do
       blk = ->(*) {}
       mailer.before(&blk)
 

spec/unit/hanami/mailer/finalizer_spec.rb

@@ -3,14 +3,14 @@
 RSpec.describe Hanami::Mailer::Finalizer do
   let(:configuration) do
     Hanami::Mailer::Configuration.new do |config|
-      config.root = 'spec/support/fixtures'
+      config.root = "spec/support/fixtures"
     end
   end
 
-  let(:mailers) { [double('mailer', template_name: "invoice")] }
+  let(:mailers) { [double("mailer", template_name: "invoice")] }
 
-  describe '.finalize' do
-    it 'eager autoloads modules from mail gem' do
+  describe ".finalize" do
+    it "eager autoloads modules from mail gem" do
       expect(Mail).to receive(:eager_autoload!)
       described_class.finalize(mailers, configuration)
     end

spec/unit/hanami/mailer_spec.rb

@@ -121,46 +121,46 @@ RSpec.describe Hanami::Mailer do
     end
   end
 
-  describe '#render' do
-    describe 'when template is explicitly declared' do
+  describe "#render" do
+    describe "when template is explicitly declared" do
       let(:mailer) { InvoiceMailer.new(configuration: configuration) }
 
-      it 'renders the given template' do
+      it "renders the given template" do
         expect(mailer.render(:html, {})).to include(%(<h1>Invoice template</h1>))
       end
     end
 
-    describe 'when template is implicitly declared' do
+    describe "when template is implicitly declared" do
       let(:mailer) { LazyMailer.new(configuration: configuration) }
 
-      it 'looks for template with same name with inflected classname and render it' do
+      it "looks for template with same name with inflected classname and render it" do
         expect(mailer.render(:html, {})).to include(%(Hello World))
         expect(mailer.render(:txt, {})).to include(%(This is a txt template))
       end
     end
 
-    describe 'when mailer defines context' do
+    describe "when mailer defines context" do
       let(:mailer) { WelcomeMailer.new(configuration: configuration) }
 
-      it 'renders template with defined context' do
+      it "renders template with defined context" do
         expect(mailer.render(:txt, {})).to include(%(Ahoy))
       end
     end
 
-    describe 'when locals are parsed in' do
+    describe "when locals are parsed in" do
       let(:mailer) { RenderMailer.new(configuration: configuration) }
-      let(:locals) { { user: User.new('Luca') } }
+      let(:locals) { { user: User.new("Luca") } }
 
-      it 'renders template with parsed locals' do
+      it "renders template with parsed locals" do
         expect(mailer.render(:html, locals)).to include(locals.fetch(:user).name)
       end
     end
 
-    describe 'with HAML template engine' do
+    describe "with HAML template engine" do
       let(:mailer) { TemplateEngineMailer.new(configuration: configuration) }
-      let(:locals) { { user: User.new('MG') } }
+      let(:locals) { { user: User.new("MG") } }
 
-      it 'renders template with parsed locals' do
+      it "renders template with parsed locals" do
         expect(mailer.render(:html, locals)).to include(%(<h1>\n#{locals.fetch(:user).name}\n</h1>\n))
       end
     end