Specify supported rails versions

.gitignore

@@ -5,9 +5,9 @@
 /InstalledFiles
 /pkg/
 /spec/reports/
-/spec/test_app/db/*.sqlite3
-/spec/test_app/log/*
-/spec/test_app/tmp/*
+/spec/test_apps/*/db/*.sqlite3
+/spec/test_apps/*/log/*
+/spec/test_apps/*/tmp/*
 /tmp/
 
 ## Documentation cache and generated files:
@@ -25,3 +25,5 @@
 
 node_modules
 npm-debug.log
+
+gemfiles/*.gemfile.lock

Appraisals

@@ -0,0 +1,6 @@
+%w[
+  4.2.10
+].each do |rails_version|
+  ENV['APPRAISAL_RAILS_VERSION'] = rails_version
+  appraise("rails-#{rails_version}") { gem 'rails', rails_version }
+end

Rakefile

@@ -1,26 +1,18 @@
-begin
-  require 'bundler/setup'
-rescue LoadError
-  puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
-end
+require 'bundler/gem_tasks'
+require 'rspec/core/rake_task'
 
-require 'rdoc/task'
+RSpec::Core::RakeTask.new(:spec)
 
-RDoc::Task.new(:rdoc) do |rdoc|
-  rdoc.rdoc_dir = 'rdoc'
-  rdoc.title    = 'Guide'
-  rdoc.options << '--line-numbers'
-  rdoc.rdoc_files.include('README.rdoc')
-  rdoc.rdoc_files.include('lib/**/*.rb')
+task :setup_test_app, [:rails_version] do |_task, args|
+  require_relative './spec/test_apps/setup'
+  TestApps::Setup.call args.fetch(:rails_version) {
+    abort "Example usage: rake #{ARGV[0]}[5.1.4]"
+  }
 end
 
-APP_RAKEFILE = File.expand_path("../spec/test_app/Rakefile", __FILE__)
-load 'rails/tasks/engine.rake'
-
-
-load 'rails/tasks/statistics.rake'
-
-
-
-Bundler::GemHelper.install_tasks
-
+if ENV['APPRAISAL_INITIALIZED'] || ENV['TRAVIS']
+  task default: :spec
+else
+  require 'appraisal'
+  task default: :appraisal
+end

gemfiles/rails_4.2.10.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", "4.2.10"
+
+gemspec path: "../"

guide.gemspec

@@ -17,6 +17,7 @@ Gem::Specification.new do |s|
   s.add_dependency "rails", ">= 3.1", "< 5"
   s.add_dependency "sass-rails", ">= 3.2"
 
+  s.add_development_dependency "appraisal"
   s.add_development_dependency "sqlite3"
   s.add_development_dependency "rspec-rails"
   s.add_development_dependency "pry"

scripts/buildkite_build.sh

@@ -3,4 +3,5 @@
 set -ex
 
 bundle install --path vendor/bundle --retry 3
-bundle exec rspec spec
+bundle exec appraisal install
+bundle exec appraisal rspec spec

spec/rails_helper.rb

@@ -1,6 +1,9 @@
 # This file is copied to spec/ when you run 'rails generate rspec:install'
 ENV['RAILS_ENV'] ||= 'test'
-require File.expand_path("../../spec/test_app/config/environment", __FILE__)
+
+rails_version = ENV.fetch('APPRAISAL_RAILS_VERSION', '4.2.10')
+require File.expand_path("../../spec/test_apps/rails-#{rails_version}/config/environment", __FILE__)
+
 # Prevent database truncation if the environment is production
 abort("The Rails environment is running in production mode!") if Rails.env.production?
 require 'spec_helper'

spec/test_apps/rails-4.2.10/app

@@ -0,0 +1 @@
+../shared/app

spec/test_app/config/application.rb → spec/test_apps/rails-4.2.10/config/application.rb

@@ -24,7 +24,6 @@ class Application < Rails::Application
     # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
     # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
     # config.i18n.default_locale = :de
-    config.i18n.load_path += Dir[Rails.root.join('../../config', 'locales', '**', '*.{rb,yml}')]
 
     # Do not swallow errors in after_commit/after_rollback callbacks.
     config.active_record.raise_in_transactional_callbacks = true

spec/test_apps/rails-4.2.10/config/database.yml

@@ -0,0 +1 @@
+../../shared/config/database.yml

spec/test_apps/rails-4.2.10/config/initializers/i18n.rb

@@ -0,0 +1 @@
+../../../shared/config/initializers/i18n.rb

spec/test_apps/setup.rb

@@ -0,0 +1,100 @@
+module TestApps
+  class Setup
+    def self.call(*args)
+      new(*args).call
+    end
+
+    def initialize(rails_version)
+      @rails_version = rails_version
+    end
+
+    def call
+      return if completed?
+      abort(generate_app_instructions) unless app_exists?
+      add_symlinks
+      puts "Done!"
+    end
+
+    private
+
+    attr_reader :rails_version
+
+    def completed?
+      app_exists? && symlinks_exist?
+    end
+
+    def app_exists?
+      Dir.exists?(root)
+    end
+
+    def root
+      File.join(test_apps_root, "rails-#{rails_version}")
+    end
+
+    def test_apps_root
+      File.expand_path('..', __FILE__)
+    end
+
+    def symlinks_exist?
+      symlink_sources.all? do |source|
+        File.exist?(symlink_dest(source))
+      end
+    end
+
+    def symlink_sources
+      Dir[File.join(shared_root, '**/*')].select(&File.method(:file?))
+    end
+
+    def symlink_dest(source)
+      source.sub(shared_root, root)
+    end
+
+    def shared_root
+      File.join(test_apps_root, 'shared')
+    end
+
+    def generate_app_instructions
+      <<~EOS
+
+        A test app running rails v#{rails_version} needs to be added.
+
+        This can be achieved by running:
+
+            cd /tmp \\
+            && gem install rails -v#{rails_version} \\
+            && rails _#{rails_version}_ new test_app \\
+              --database=sqlite3 \\
+              --skip-yarn \\
+              --skip-gemfile \\
+              --skip-git \\
+              --skip-keeps \\
+              --skip-action-mailer \\
+              --skip-puma \\
+              --skip-action-cable \\
+              --skip-spring \\
+              --skip-listen \\
+              --skip-coffee \\
+              --skip-turbolinks \\
+              --skip-test \\
+              --skip-system-test \\
+              --skip-bundle \\
+            && mv test_app #{root} \\
+            && cd #{gem_root} \\
+            && bundle exec rake setup_test_app[#{rails_version}]
+
+      EOS
+    end
+
+    def gem_root
+      File.expand_path('../../..', __FILE__)
+    end
+
+    def add_symlinks
+      symlink_sources.all? do |source|
+        dest = symlink_dest(source)
+        FileUtils.mkdir_p File.dirname(dest)
+        FileUtils.ln_sf source, dest
+      end
+    end
+  end
+end

spec/test_apps/shared/config/initializers/i18n.rb

@@ -0,0 +1 @@
+Rails.application.config.i18n.load_path += Dir[Rails.root.join('../../../config', 'locales', '**', '*.{rb,yml}')]