Fix test suite and test against multiple ruby/rails versions

.travis.yml

@@ -6,22 +6,33 @@ env:
   global:
     - CC_TEST_REPORTER_ID=98c9b3070ea9ac0e8f7afb6570f181506c3a06372b1db5c7deb8e46089fdf132
     - GIT_COMMITTED_AT=$(if [ "$TRAVIS_PULL_REQUEST" == "false" ]; then git log -1 --pretty=format:%ct; else git log -1 --skip 1 --pretty=format:%ct; fi)
+  matrix:
+    - RAILS_VERSION=5.0.0
+    - RAILS_VERSION=5.1.0
+    - RAILS_VERSION=5.2.0
+    - RAILS_VERSION=master
 rvm:
-  - 2.2.2
-  - 2.3.3
+  - 2.2.10
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1
   - ruby-head
 matrix:
   allow_failures:
     - rvm: ruby-head
+    - env: RAILS_VERSION=master
+  exclude:
+    - rvm: 2.3.7
+      env: RAILS_VERSION=master
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
   - ./cc-test-reporter before-build
 after_script:
-  # Preferably you will run test-reporter on branch update events. But 
-  # if you setup travis to build PR updates only, you don't need to run 
+  # Preferably you will run test-reporter on branch update events. But
+  # if you setup travis to build PR updates only, you don't need to run
   # the line below
   - if [ "$TRAVIS_PULL_REQUEST" == "false" ]; then ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT; fi
-  # In the case where travis is setup to build PR updates only, 
+  # In the case where travis is setup to build PR updates only,
   # uncomment the line below
   # - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT

Gemfile

@@ -1,3 +1,15 @@
 source 'https://rubygems.org'
 
+rails_version = ENV['RAILS_VERSION'] || "default"
+rails = case rails_version
+        when 'master'
+          { github: 'rails/rails' }
+        when 'default'
+          '>= 5.0'
+        else
+          "~> #{ENV['RAILS_VERSION']}"
+        end
+
+gem 'rails', rails
+
 gemspec

spec/dummy/config/initializers/new_framework_defaults.rb

@@ -18,7 +18,9 @@
 Rails.application.config.active_record.belongs_to_required_by_default = true
 
 # Do not halt callback chains when a callback returns false. Previous versions had true.
-ActiveSupport.halt_callback_chains_on_return_false = false
+if Rails.version.to_f < 5.2
+  ActiveSupport.halt_callback_chains_on_return_false = false
+end
 
 # Configure SSL options to enable HSTS with subdomains. Previous versions had false.
 Rails.application.config.ssl_options = { hsts: { subdomains: true } }