Drop obsolete deps, upgrade to new deps

* Drop dependency on older versions of RSpec. RSpec 3.x is the only
  version supported now.
* Drop dependency on Minitest 4.x. Minitest 5.x is the only version
  supported now.
* Drop dependency on older versions of Rails. Rails 4.2.x, 5.1.x, and
  5.2.x are the only versions supported now.
* Drop dependency on older versions of Ruby. Ruby 2.3.x, 2.4.x, and
  2.5.x are the only versions supported now.

.gitignore

@@ -1,5 +1,4 @@
 .bundle
-Gemfile.lock
 vendor/ruby
 vendor/cache
 doc

.rubocop.yml

@@ -1,5 +1,7 @@
 AllCops:
   TargetRubyVersion: 2.4
+  Exclude:
+    - '*.gemspec'
 Layout/AlignParameters:
   EnforcedStyle: with_fixed_indentation
 Layout/ConditionPosition:

.ruby-version

@@ -1 +1 @@
-2.0.0-p247
+2.6.1

.travis.yml

@@ -1,3 +1,28 @@
+language: ruby
+sudo: false
+cache:
+  directories:
+    - vendor/bundle
+script: "bundle exec rake"
+# Source: <https://docs.travis-ci.com/user/languages/ruby/#bundler-20>
+before_install:
+  - gem update --system '2.7.8' --no-document
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '< 2' --no-document
+install: "bundle install --jobs=3 --retry=3 --path vendor/bundle"
+
 rvm:
-  - 1.9.3
-  - 2.0.0
+  - 2.6.1
+  - 2.5.1
+  - 2.4.4
+  - 2.3.7
+
+env:
+  - TEST_FRAMEWORK=minitest
+  - TEST_FRAMEWORK=test_unit
+
+gemfile:
+  - gemfiles/rails_4_2.gemfile
+  - gemfiles/rails_5_0.gemfile
+  - gemfiles/rails_5_1.gemfile
+  - gemfiles/rails_5_2.gemfile

Appraisals

@@ -1,44 +1,35 @@
-appraise 'rails_3_0' do
-  gem 'rails', '~> 3.0.0'
-  gem 'sqlite3'
+shared_dependencies = proc do
+  gem "sqlite3", "~> 1.3.6"
 end
 
-appraise 'rails_3_1' do
-  gem 'rails', '~> 3.1.0'
-  gem 'jquery-rails'
-  gem 'sass-rails'
-  gem 'sqlite3'
-end
+appraise "rails_4_2" do
+  instance_eval(&shared_dependencies)
 
-appraise 'rails_3_2' do
-  gem 'rails', '~> 3.2.0'
-  gem 'jquery-rails'
-  gem 'sass-rails'
-  gem 'sqlite3'
+  gem "rails", "~> 4.2.0"
+  # gem 'jquery-rails'
+  # gem 'sass-rails'
 end
 
-appraise 'rails_4_0' do
-  gem 'rails', '~> 4.0.0'
-  gem 'jquery-rails'
-  gem 'sass-rails'
-  gem 'sqlite3'
-end
+appraise "rails_5_0" do
+  instance_eval(&shared_dependencies)
 
-appraise 'rails_4_1' do
-  gem 'rails', github: 'rails/rails', branch: '4-1-stable'
-  gem 'jquery-rails'
-  gem 'sass-rails'
-  gem 'sqlite3'
+  gem "rails", "~> 5.0.0"
+  # gem 'jquery-rails'
+  # gem 'sass-rails'
 end
 
-appraise 'minitest_4_x' do
-  gem 'minitest', '~> 4.0'
-end
+appraise "rails_5_1" do
+  instance_eval(&shared_dependencies)
 
-appraise 'minitest_5_x' do
-  gem 'minitest', '~> 5.0'
+  gem "rails", "~> 5.1.0"
+  # gem 'jquery-rails'
+  # gem 'sass-rails'
 end
 
-appraise 'test_unit' do
-  gem 'test-unit'
+appraise "rails_5_2" do
+  instance_eval(&shared_dependencies)
+
+  gem "rails", "~> 5.2.0"
+  # gem 'jquery-rails'
+  # gem 'sass-rails'
 end

Gemfile

@@ -1,3 +1,12 @@
-source 'http://rubygems.org'
+source "https://rubygems.org"
 
 gemspec
+
+gem "m"
+gem "minitest"
+gem "mocha"
+gem "pry"
+gem "pry-byebug"
+gem "rails"
+gem "rake"
+gem "test-unit"

Gemfile.lock

@@ -0,0 +1,155 @@
+PATH
+  remote: .
+  specs:
+    shoulda-context (1.2.2)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (5.2.2)
+      actionpack (= 5.2.2)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailer (5.2.2)
+      actionpack (= 5.2.2)
+      actionview (= 5.2.2)
+      activejob (= 5.2.2)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.2.2)
+      actionview (= 5.2.2)
+      activesupport (= 5.2.2)
+      rack (~> 2.0)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionview (5.2.2)
+      activesupport (= 5.2.2)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (5.2.2)
+      activesupport (= 5.2.2)
+      globalid (>= 0.3.6)
+    activemodel (5.2.2)
+      activesupport (= 5.2.2)
+    activerecord (5.2.2)
+      activemodel (= 5.2.2)
+      activesupport (= 5.2.2)
+      arel (>= 9.0)
+    activestorage (5.2.2)
+      actionpack (= 5.2.2)
+      activerecord (= 5.2.2)
+      marcel (~> 0.3.1)
+    activesupport (5.2.2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    appraisal (2.2.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    arel (9.0.0)
+    builder (3.2.3)
+    byebug (10.0.2)
+    coderay (1.1.2)
+    concurrent-ruby (1.1.4)
+    crass (1.0.4)
+    erubi (1.8.0)
+    globalid (0.4.2)
+      activesupport (>= 4.2.0)
+    i18n (1.5.3)
+      concurrent-ruby (~> 1.0)
+    loofah (2.2.3)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    m (1.5.1)
+      method_source (>= 0.6.7)
+      rake (>= 0.9.2.2)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    marcel (0.3.3)
+      mimemagic (~> 0.3.2)
+    metaclass (0.0.4)
+    method_source (0.9.2)
+    mimemagic (0.3.3)
+    mini_mime (1.0.1)
+    mini_portile2 (2.4.0)
+    minitest (5.11.3)
+    mocha (1.8.0)
+      metaclass (~> 0.0.1)
+    nio4r (2.3.1)
+    nokogiri (1.10.1)
+      mini_portile2 (~> 2.4.0)
+    power_assert (1.1.3)
+    pry (0.12.2)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    pry-byebug (3.6.0)
+      byebug (~> 10.0)
+      pry (~> 0.10)
+    rack (2.0.6)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rails (5.2.2)
+      actioncable (= 5.2.2)
+      actionmailer (= 5.2.2)
+      actionpack (= 5.2.2)
+      actionview (= 5.2.2)
+      activejob (= 5.2.2)
+      activemodel (= 5.2.2)
+      activerecord (= 5.2.2)
+      activestorage (= 5.2.2)
+      activesupport (= 5.2.2)
+      bundler (>= 1.3.0)
+      railties (= 5.2.2)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.0.4)
+      loofah (~> 2.2, >= 2.2.2)
+    railties (5.2.2)
+      actionpack (= 5.2.2)
+      activesupport (= 5.2.2)
+      method_source
+      rake (>= 0.8.7)
+      thor (>= 0.19.0, < 2.0)
+    rake (12.3.2)
+    sprockets (3.7.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.1)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    test-unit (3.3.0)
+      power_assert
+    thor (0.20.3)
+    thread_safe (0.3.6)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+    websocket-driver (0.7.0)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  appraisal
+  bundler (~> 1.0)
+  m
+  minitest
+  mocha
+  pry
+  pry-byebug
+  rails
+  rake
+  shoulda-context!
+  test-unit
+
+BUNDLED WITH
+   1.17.3

Rakefile

@@ -1,21 +1,21 @@
-require 'bundler/setup'
-require 'bundler/gem_tasks'
-require 'rake/testtask'
-require 'appraisal'
+require "bundler/setup"
+require "bundler/gem_tasks"
+require "rake/testtask"
+require "appraisal"
 
 $LOAD_PATH.unshift("lib")
-load 'tasks/shoulda.rake'
+load "tasks/shoulda.rake"
 
 Rake::TestTask.new do |t|
-  t.libs << 'lib' << 'test'
-  t.pattern = 'test/**/*_test.rb'
+  t.libs << "lib" << "test"
+  t.pattern = "test/**/*_test.rb"
   t.verbose = false
 end
 
-desc 'Test the plugin under all supported Rails versions.'
-task :all => ['appraisal:cleanup', 'appraisal:install'] do
-  exec('rake appraisal test')
+task :default do
+  if ENV["CI"]
+    exec "rake test --trace"
+  else
+    exec "appraisal install && appraisal rake test --trace"
+  end
 end
-
-desc 'Default: run tests'
-task :default => [:all]