use a separate RAILS_VERSION=none for testing...

... instead of running unit tests twice (with/without rails) for each
rails version.

This commit also catches an issue where genspec is used with Thor (outside
of Rails), because activesupport is an undeclared dependency in that
environment.

.travis.yml

@@ -15,6 +15,7 @@ env:
   - RAILS_VERSION="~> 4.1.0"
   - RAILS_VERSION="~> 4.2.0"
   - RAILS_VERSION="~> 5.0.0"
+  - RAILS_VERSION="none"
 
 matrix:
   allow_failures:

Gemfile

@@ -2,4 +2,6 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem 'rails', ENV['RAILS_VERSION'] || '>= 3'
+if ENV['RAILS_VERSION'] != 'none'
+  gem 'rails', ENV['RAILS_VERSION'] || '>= 3'
+end

Rakefile

@@ -9,8 +9,6 @@ require 'coveralls/rake/task'
 Coveralls::RakeTask.new
 
 task :default do
-  run "rspec", "spec"
-  ENV['USE_RAILS'] = '1'
   run "rspec", "spec"
   Rake::Task['coveralls:push'].invoke
 end

genspec.gemspec

@@ -24,7 +24,9 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'thor'
   s.add_dependency 'rspec', '~> 2'
+  s.add_dependency 'activesupport', '>= 3', '<= 5'
 
   s.add_development_dependency 'coveralls'
+  s.add_development_dependency 'rake'
 end
 

spec/spec_helper.rb

@@ -9,7 +9,7 @@
 require 'bundler'
 Bundler.setup
 
-if ENV['USE_RAILS']
+if ENV['RAILS_VERSION'] != 'none'
   require 'rails'
   require 'rails/generators'
 end