Relax and test against Rails master (6.0.0.alpha)

Author: sikachu

.travis.yml

@@ -9,6 +9,7 @@ gemfile:
   - Gemfile
   - gemfiles/Gemfile-rails-5-0
   - gemfiles/Gemfile-rails-5-2
+  - gemfiles/Gemfile-rails-master
 matrix:
   allow_failures:
     - rvm: ruby-head

gemfiles/Gemfile-rails-master

@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+gemspec path: '..'
+
+gem 'actionpack', git: "https://github.com/rails/rails.git"

rails-controller-testing.gemspec

@@ -18,11 +18,11 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 2.2.2'
 
-  s.add_dependency "actionpack", "~> 5.x", ">= 5.0.1"
-  s.add_dependency "actionview", "~> 5.x", ">= 5.0.1"
-  s.add_dependency "activesupport", "~> 5.x"
+  s.add_dependency "actionpack", ">= 5.0.1", "< 6.1.x"
+  s.add_dependency "actionview", ">= 5.0.1", "< 6.1.x"
+  s.add_dependency "activesupport", ">= 5.0.1", "< 6.1.x"
 
-  s.add_development_dependency "railties", "~> 5.x"
+  s.add_development_dependency "railties", "> 5.0.1", "< 6.1.x"
 
   if defined?(JRUBY_VERSION)
     s.add_development_dependency "jdbc-sqlite3"