[Rails5] Add `rails-controller-testing` gemblackst0ne-rails5-add-rails-controller-testing-gem

In Rails 5.0 `assert_template` and `assigns()` have been extracted to
the `rails-controller-testing` gem.
https://github.com/rails/rails/pull/20138/files

This commit adds this gem for rails5.

1 files changed, 1 insertions, 0 deletions

diff --git a/Gemfile b/Gemfile
index d85ee988644..7f5b1f1d3ef 100644
--- a/Gemfile
+++ b/Gemfile
@@ -384,6 +384,7 @@ group :test do
   gem 'email_spec', '~> 1.6.0'
   gem 'json-schema', '~> 2.8.0'
   gem 'webmock', '~> 2.3.2'
+  gem 'rails-controller-testing' if rails5? # Rails5 only gem.
   gem 'test_after_commit', '~> 1.1' unless rails5? # Remove this gem when migrated to rails 5.0. It's been integrated to rails 5.0.
   gem 'sham_rack', '~> 1.3.6'
   gem 'concurrent-ruby', '~> 1.0.5'