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Test with current versions of Rails: 6.1, 7.0, 7.1.

Drop end-of-life'd versions of rails: 5.2 and 6.0, and ruby
3.0. Prepare for upcoming (Rails 7.2? and) Ruby 3.4.

Comment out three assertions related to open bug on deleted models.

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: Tests
+
+on:
+  pull_request:
+    branches:
+      - '*'
+  push:
+    branches:
+      - master
+      - github-actions
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby: ['3.1', '3.2', '3.3']
+        gemfile:
+          - rails_6_1
+          - rails_7
+          - rails_7_1
+
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+      BUNDLE_PATH_RELATIVE_TO_CWD: true
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler: default
+          bundler-cache: true
+          rubygems: latest
+
+      - name: Run tests
+        env:
+          RAILS_ENV: test
+        run: |
+          bundle exec rake setup
+          bundle exec rake test

Appraisals

@@ -0,0 +1,11 @@
+appraise 'rails_6_1' do
+  gem 'rails', '~> 6.1'
+end
+
+appraise 'rails_7' do
+  gem 'rails', '~> 7.0'
+end
+
+appraise 'rails_7_1' do
+  gem 'rails', '~> 7.1'
+end

Gemfile

@@ -2,7 +2,12 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem 'rails', "~> #{ENV.fetch('RAILS_VERSION', 6.0)}"
+# Ruby 3.4?
+# gem 'base64'
+# gem 'mutex_m'
+# gem 'observer'
+
+gem "rails"
 
 group :development, :test do
   gem 'sqlite3', '~> 1.4'

Rakefile

@@ -1,4 +1,3 @@
-# encoding: UTF-8
 begin
   require 'bundler/setup'
 rescue LoadError
@@ -7,8 +6,10 @@ end
 
 require 'rake/testtask'
 
-desc 'Default: run tests for all ORMs.'
-task default: [:setup, :test, :api_test]
+desc 'Default: run tests for all rails\' versions.'
+if !ENV["APPRAISAL_INITIALIZED"]
+  task default: [:setup, :appraisal]
+end
 
 task :setup do
   system "cd test/dummy && rake db:migrate && rake db:test:prepare"

gemfiles/rails_6_1.gemfile

@@ -0,0 +1,12 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", "~> 6.1"
+gem "coveralls", "~> 0.8.23", require: false
+
+group :development, :test do
+  gem "sqlite3", "~> 1.4"
+end
+
+gemspec path: "../"

gemfiles/rails_6_1.gemfile.lock

@@ -0,0 +1,253 @@
+PATH
+  remote: ..
+  specs:
+    merit (4.0.3)
+      ambry (~> 1.0.0)
+      zeitwerk
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (6.1.7.8)
+      actionpack (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailbox (6.1.7.8)
+      actionpack (= 6.1.7.8)
+      activejob (= 6.1.7.8)
+      activerecord (= 6.1.7.8)
+      activestorage (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+      mail (>= 2.7.1)
+    actionmailer (6.1.7.8)
+      actionpack (= 6.1.7.8)
+      actionview (= 6.1.7.8)
+      activejob (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (6.1.7.8)
+      actionview (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+      rack (~> 2.0, >= 2.0.9)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (6.1.7.8)
+      actionpack (= 6.1.7.8)
+      activerecord (= 6.1.7.8)
+      activestorage (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+      nokogiri (>= 1.8.5)
+    actionview (6.1.7.8)
+      activesupport (= 6.1.7.8)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (6.1.7.8)
+      activesupport (= 6.1.7.8)
+      globalid (>= 0.3.6)
+    activemodel (6.1.7.8)
+      activesupport (= 6.1.7.8)
+    activerecord (6.1.7.8)
+      activemodel (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+    activestorage (6.1.7.8)
+      actionpack (= 6.1.7.8)
+      activejob (= 6.1.7.8)
+      activerecord (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+      marcel (~> 1.0)
+      mini_mime (>= 1.1.0)
+    activesupport (6.1.7.8)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
+    ambry (1.0.0)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    ast (2.4.2)
+    bigdecimal (3.1.8)
+    builder (3.3.0)
+    capybara (3.40.0)
+      addressable
+      matrix
+      mini_mime (>= 0.1.3)
+      nokogiri (~> 1.11)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      regexp_parser (>= 1.5, < 3.0)
+      xpath (~> 3.2)
+    concurrent-ruby (1.3.3)
+    coveralls (0.8.23)
+      json (>= 1.8, < 3)
+      simplecov (~> 0.16.1)
+      term-ansicolor (~> 1.3)
+      thor (>= 0.19.4, < 2.0)
+      tins (~> 1.6)
+    crass (1.0.6)
+    date (3.3.4)
+    docile (1.4.0)
+    erubi (1.13.0)
+    globalid (1.2.1)
+      activesupport (>= 6.1)
+    i18n (1.14.5)
+      concurrent-ruby (~> 1.0)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
+    loofah (2.22.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
+      mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    marcel (1.0.4)
+    matrix (0.4.2)
+    method_source (1.1.0)
+    mini_mime (1.1.5)
+    minitest (5.24.1)
+    minitest-rails (6.1.1)
+      minitest (~> 5.10)
+      railties (~> 6.1.0)
+    mize (0.4.1)
+      protocol (~> 2.0)
+    mocha (2.4.0)
+      ruby2_keywords (>= 0.0.5)
+    net-imap (0.4.14)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.5.0)
+      net-protocol
+    nio4r (2.7.3)
+    nokogiri (1.16.6-arm64-darwin)
+      racc (~> 1.4)
+    parallel (1.25.1)
+    parser (3.3.3.0)
+      ast (~> 2.4.1)
+      racc
+    protocol (2.0.0)
+      ruby_parser (~> 3.0)
+    public_suffix (6.0.0)
+    racc (1.8.0)
+    rack (2.2.9)
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rails (6.1.7.8)
+      actioncable (= 6.1.7.8)
+      actionmailbox (= 6.1.7.8)
+      actionmailer (= 6.1.7.8)
+      actionpack (= 6.1.7.8)
+      actiontext (= 6.1.7.8)
+      actionview (= 6.1.7.8)
+      activejob (= 6.1.7.8)
+      activemodel (= 6.1.7.8)
+      activerecord (= 6.1.7.8)
+      activestorage (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+      bundler (>= 1.15.0)
+      railties (= 6.1.7.8)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.2.0)
+      activesupport (>= 5.0.0)
+      minitest
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
+    railties (6.1.7.8)
+      actionpack (= 6.1.7.8)
+      activesupport (= 6.1.7.8)
+      method_source
+      rake (>= 12.2)
+      thor (~> 1.0)
+    rainbow (3.1.1)
+    rake (13.2.1)
+    regexp_parser (2.9.2)
+    rexml (3.3.1)
+      strscan
+    rubocop (1.64.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    ruby-progressbar (1.13.0)
+    ruby2_keywords (0.0.5)
+    ruby_parser (3.21.0)
+      racc (~> 1.5)
+      sexp_processor (~> 4.16)
+    sexp_processor (4.17.1)
+    simplecov (0.16.1)
+      docile (~> 1.1)
+      json (>= 1.8, < 3)
+      simplecov-html (~> 0.10.0)
+    simplecov-html (0.10.2)
+    sprockets (4.2.1)
+      concurrent-ruby (~> 1.0)
+      rack (>= 2.2.4, < 4)
+    sprockets-rails (3.5.1)
+      actionpack (>= 6.1)
+      activesupport (>= 6.1)
+      sprockets (>= 3.0.0)
+    sqlite3 (1.7.3-arm64-darwin)
+    strscan (3.1.0)
+    sync (0.5.0)
+    term-ansicolor (1.10.2)
+      mize
+      tins (~> 1.0)
+    thor (1.3.1)
+    timeout (0.4.1)
+    tins (1.33.0)
+      bigdecimal
+      sync
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.5.0)
+    webrick (1.8.1)
+    websocket-driver (0.7.6)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    xpath (3.2.0)
+      nokogiri (~> 1.8)
+    zeitwerk (2.6.16)
+
+PLATFORMS
+  arm64-darwin
+  x86_64-linux
+
+DEPENDENCIES
+  appraisal
+  capybara
+  coveralls (~> 0.8.23)
+  merit!
+  minitest-rails
+  mocha
+  rails (~> 6.1)
+  rubocop
+  simplecov
+  sqlite3 (~> 1.4)
+  webrick
+
+BUNDLED WITH
+   2.5.14

gemfiles/rails_7.gemfile

@@ -0,0 +1,12 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", "~> 7.0"
+gem "coveralls", "~> 0.8.23", require: false
+
+group :development, :test do
+  gem "sqlite3", "~> 1.4"
+end
+
+gemspec path: "../"