Workflows / CI: fixed & refactored

## Fixed

* Ruby 2.6 (see hotwired/turbo-rails/#681).

## Changed

* Moved Rails versions to CI `matrix`.
* Both edge and outdated Ruby / Rails versions may fail.
* Use the latest RubyGems.

.github/workflows/ci.yml

@@ -2,27 +2,42 @@
 name: CI
 
 on:
-  - push
-  - pull_request
+  push:
+    branches:
+      - master
+  pull_request:
 
 permissions:
   contents: read
 
 jobs:
   rspec:
-    runs-on: ubuntu-20.04
+    name: >-
+      rspec (${{ matrix.ruby }})
+
+    runs-on: ubuntu-latest
+
     strategy:
       fail-fast: false
       matrix:
         ruby:
-          - '3.3'
-          - '3.2'
-          - '3.1'
-          - '3.0'
-          - '2.7'
-          - '2.6'
-          - '2.5'
-          - '2.4'
+          - 3.3
+          - 3.2
+          - 3.1
+        rails:
+          - 6.1 # TODO: move to 7.2
+        include:
+          # Edge
+          - { ruby: 'head', rails: 'edge', allow-fail: true }
+          # Outdated
+          - { ruby: '3.0',  rails: '6.1' } # TODO: move to 7.1
+          - { ruby: '2.7',  rails: '6'   } # RSpec AR Expectations support Rails 7.1 since Ruby 3.0
+          - { ruby: '2.6',  rails: '6'   }
+          - { ruby: '2.5',  rails: '6'   }
+          - { ruby: '2.4',  rails: '5'   }
+
+    env:
+      RAILS_VERSION: "${{ matrix.rails }}"
 
     services:
       mongodb:
@@ -31,13 +46,13 @@ jobs:
           - 27017:27017
 
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
+      - uses: actions/checkout@v4
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
+          rubygems: latest
           bundler-cache: true
 
       - name: RSpec & publish code coverage
@@ -46,3 +61,11 @@ jobs:
           CC_TEST_REPORTER_ID: b7ba588af2a540fa96c267b3655a2afe31ea29976dc25905a668dd28d5e88915
         with:
           coverageCommand: bin/rake
+        continue-on-error: ${{ matrix.allow-fail }}
+        id: test
+
+      - name: >-
+          Test ${{ steps.test.outcome }}
+        run: |
+          echo Ruby  ${{ matrix.ruby  }}
+          echo Rails ${{ matrix.rails }}

Gemfile

@@ -2,6 +2,8 @@ source "https://rubygems.org"
 
 gemspec
 
+gem 'puma'
+
 platforms :ruby do
   if RUBY_VERSION >= "2.5.0"
     gem 'sqlite3', '~> 1.4'
@@ -15,32 +17,28 @@ platforms :jruby do
   gem "activerecord-jdbcsqlite3-adapter"
 end
 
-if RUBY_VERSION >= "2.6.0"
-  gem "turbo-rails"
-  gem "redis", "~> 4.0"
-end
+gem 'mongoid'
 
-if RUBY_VERSION >= "2.5.0"
-  gem "rails", "~> 6.0"
-  gem 'webrick'
+case rails_version = ENV['RAILS_VERSION']
+when nil
+  gem 'rails'
+when 'edge'
+  gem 'rails', github: 'rails/rails'
 else
-  gem "rails", "~> 5.0"
+  gem 'rails', "~> #{rails_version}.0"
 end
 
-if RUBY_VERSION >= "2.7.0"
-  gem "mongoid", github: "mongodb/mongoid"
-elsif RUBY_VERSION >= "2.6.0"
-  gem "mongoid", "~> 8.1"
-else
-  gem "mongoid", "~> 7.2"
-end
-
-if RUBY_VERSION >= "3.1.0"
-  gem "net-imap"
-  gem "net-pop"
-  gem "net-smtp"
+case RUBY_VERSION
+when '2.6'...'3.0'
+  gem "turbo-rails", "<= 2.0.7"
+  gem "redis", "~> 4.0"
+when '3.0'...'4'
+  gem 'turbo-rails'
+  gem 'redis', '~> 4.0'
 end
 
 if RUBY_VERSION < "2.5.0"
+  gem 'rspec-activerecord-expectations', '~> 1.2.0'
+  gem 'simplecov', '0.17.1'
   gem "loofah", "< 2.21.0" # Workaround for `uninitialized constant Nokogiri::HTML4`
 end

draper.gemspec

@@ -26,10 +26,10 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'ammeter'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec-rails'
-  s.add_development_dependency 'rspec-activerecord-expectations', '~> 1.2.0'
+  s.add_development_dependency 'rspec-activerecord-expectations'
   s.add_development_dependency 'minitest-rails'
   s.add_development_dependency 'capybara'
   s.add_development_dependency 'active_model_serializers', '>= 0.10'
   s.add_development_dependency 'rubocop'
-  s.add_development_dependency 'simplecov', '0.17.1'
+  s.add_development_dependency 'simplecov'
 end