Create Github Action for running CI tests

This adds CI Github Action that will run the RSpec test suite against all `gemfiles`/ supported Rails versions when pull requests are opened against  the `master` branch or commits are pushed to the `master` branch.

This will help ensure we don't merge breaking changes + make it easier to review pull requests from all contributors.

Author: Alec Clarke

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        gemfile:
+          - Gemfile.rails-5.0-stable
+          - Gemfile.rails-5.1-stable
+          - Gemfile.rails-5.2-stable
+          - Gemfile.rails-6.0-stable
+    env:
+      BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "2.6"
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rspec

gemfiles/Gemfile.rails-6-0-stable gemfiles/Gemfile.rails-6.0-stablegemfiles/Gemfile.rails-6-0-stable renamed to gemfiles/Gemfile.rails-6.0-stable

@@ -17,14 +17,21 @@
 RSpec.configure do |config|
   config.before(:suite) do
     database_config = YAML.load(File.open("#{File.dirname(__FILE__)}/support/database.yml"))
+    migrations_path = "#{File.dirname(__FILE__)}/support/migrations"
+    active_record_version = Gem::Version.new(ActiveRecord::VERSION::STRING)
+
     ActiveRecord::Base.establish_connection(database_config)
 
-    if Gem::Version.new(ActiveRecord::VERSION::STRING) == Gem::Version.new("5.2.0")
-      ActiveRecord::MigrationContext.new("#{File.dirname(__FILE__)}/support/migrations").migrate      
+    if active_record_version < Gem::Version.new("5.2")
+      ActiveRecord::Migrator.migrate(migrations_path)      
+    end
+
+    if active_record_version >= Gem::Version.new("5.2") && active_record_version < Gem::Version.new("6.0")
+      ActiveRecord::MigrationContext.new(migrations_path).migrate      
     end
 
-    if Gem::Version.new(ActiveRecord::VERSION::STRING) >= Gem::Version.new("6.0")
-      ActiveRecord::MigrationContext.new("#{File.dirname(__FILE__)}/support/migrations", ActiveRecord::SchemaMigration).migrate      
+    if active_record_version >= Gem::Version.new("6.0")
+      ActiveRecord::MigrationContext.new(migrations_path, ActiveRecord::SchemaMigration).migrate      
     end
   end
 

gemfiles/Gemfile.rails-6-0-stable.lock gemfiles/Gemfile.rails-6.0-stable.lockgemfiles/Gemfile.rails-6-0-stable.lock renamed to gemfiles/Gemfile.rails-6.0-stable.lock

@@ -1,4 +1,4 @@
-class CreateLinkTable < ActiveRecord::Migration[5.2]
+class CreateLinkTable < ActiveRecord::Migration[5.0]
 
   def up
     create_table :links do |t|

spec/spec_helper.rb

@@ -1,4 +1,4 @@
-class CreateAnimalTable < ActiveRecord::Migration[5.2]
+class CreateAnimalTable < ActiveRecord::Migration[5.0]
 
   def up
     create_table :animals do |t|

spec/support/migrations/1_create_link_table.rb

@@ -1,4 +1,4 @@
-class CreatePersonTable < ActiveRecord::Migration[5.2]
+class CreatePersonTable < ActiveRecord::Migration[5.0]
 
   def up
     create_table :people do |t|

spec/support/migrations/2_create_animal_table.rb

@@ -1,4 +1,4 @@
-class CreateFoodTable < ActiveRecord::Migration[5.2]
+class CreateFoodTable < ActiveRecord::Migration[5.0]
 
   def up
     create_table :foods do |t|

spec/support/migrations/3_create_person_table.rb

@@ -1,4 +1,4 @@
-class CreateDrinkTable < ActiveRecord::Migration[5.2]
+class CreateDrinkTable < ActiveRecord::Migration[5.0]
 
   def up
     create_table :drinks do |t|

spec/support/migrations/4_create_food_table.rb

@@ -1,4 +1,4 @@
-class CreatePlantTable < ActiveRecord::Migration[5.2]
+class CreatePlantTable < ActiveRecord::Migration[5.0]
 
   def up
     create_table :plants do |t|