Ensure we don't break on new rubocops

.gitignore

@@ -8,3 +8,5 @@
 /spec/reports/
 /tmp/
 *~
+gemfiles/vendor
+gemfiles/*.lock

.travis.yml

@@ -2,3 +2,8 @@ language: ruby
 rvm:
   - 2.3.0
 before_install: gem install bundler -v 1.11.2
+gemfile:
+  - gemfiles/rubocop_0.41.gemfile
+  - gemfiles/rubocop_0.42.gemfile
+  - gemfiles/rubocop_0.43.gemfile
+  - gemfiles/latest_rubocop.gemfile

Appraisals

@@ -0,0 +1,15 @@
+appraise 'rubocop-0.41' do
+  gem 'rubocop', '~> 0.41.0'
+end
+
+appraise 'rubocop-0.42' do
+  gem 'rubocop', '~> 0.42.0'
+end
+
+appraise 'rubocop-0.43' do
+  gem 'rubocop', '~> 0.43.0'
+end
+
+appraise 'latest-rubocop' do
+  gem 'rubocop'
+end

Rakefile

@@ -1,6 +1,8 @@
-require "bundler/gem_tasks"
-require "rspec/core/rake_task"
+require 'rubygems'
+require 'bundler/setup'
+require 'bundler/gem_tasks'
+require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new(:spec)
 
-task :default => :spec
+task default: :spec

gemfiles/.bundle/config

@@ -0,0 +1,2 @@
+---
+BUNDLE_DISABLE_SHARED_GEMS: "true"

gemfiles/latest_rubocop.gemfile

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

gemfiles/rubocop_0.41.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rubocop", "~> 0.41.0"
+
+gemspec :path => "../"

gemfiles/rubocop_0.42.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rubocop", "~> 0.42.0"
+
+gemspec :path => "../"

gemfiles/rubocop_0.43.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rubocop", "~> 0.43.0"
+
+gemspec :path => "../"

rubocop-migrations.gemspec

@@ -24,5 +24,6 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'bundler', '~> 1.11'
   spec.add_development_dependency 'rake', '~> 10.0'
-  spec.add_development_dependency 'rspec', '3.5.0'
+  spec.add_development_dependency 'rspec', '~> 3.5'
+  spec.add_development_dependency 'appraisal'
 end