Add MySQL and PostgreSQL to CI database matrix

The existing CI matrix runs exclusively against SQLite, which hides any
adapter-specific behavior (upsert semantics, conflict targets, column
types, etc.). This adds two new CI jobs — one for MySQL 8.0 and one for
PostgreSQL 16 — that run the full spec suite against a live database
service, using the latest supported Ruby/Rails/ActiveAdmin combination.

The adapter is selected by the `DB` env var (sqlite | mysql | postgres).
The test Rails app is cached per-adapter (`spec/rails/rails-<ver>-<db>`)
and the Gemfile loads the matching driver conditionally. Host, port, and
credentials are all driven from env vars so the same setup works locally
and in CI.

Author: Fivell

.github/workflows/test.yml

@@ -27,6 +27,71 @@ jobs:
           bundler-cache: true
       - name: Run tests
         run: bundle exec rspec spec
+  test-mysql:
+    name: DB mysql
+    runs-on: ubuntu-latest
+    env:
+      RAILS: '8.0.0'
+      AA: '3.5.1'
+      DB: mysql
+      DB_HOST: 127.0.0.1
+      DB_PORT: 3306
+      DB_USERNAME: root
+      DB_PASSWORD: root
+    services:
+      mysql:
+        image: mysql:8.0
+        env:
+          MYSQL_ROOT_PASSWORD: root
+          MYSQL_DATABASE: active_admin_import_test
+        ports:
+          - 3306:3306
+        options: >-
+          --health-cmd="mysqladmin ping -h localhost -uroot -proot"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=10
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.4'
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rspec spec
+  test-postgres:
+    name: DB postgres
+    runs-on: ubuntu-latest
+    env:
+      RAILS: '8.0.0'
+      AA: '3.5.1'
+      DB: postgres
+      DB_HOST: 127.0.0.1
+      DB_PORT: 5432
+      DB_USERNAME: postgres
+      DB_PASSWORD: postgres
+    services:
+      postgres:
+        image: postgres:16
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: active_admin_import_test
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd="pg_isready -U postgres"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=10
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.4'
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rspec spec
   coverage:
     name: Coverage
     runs-on: ubuntu-latest

Gemfile

@@ -12,7 +12,14 @@ gem 'sass-rails'
 group :test do
   gem 'simplecov', require: false
   gem 'rspec-rails'
-  gem 'sqlite3', '~> 2.0'
+  case ENV['DB']
+  when 'mysql'
+    gem 'mysql2'
+  when 'postgres', 'postgresql'
+    gem 'pg'
+  else
+    gem 'sqlite3', '~> 2.0'
+  end
   gem 'database_cleaner'
   gem 'capybara'
   gem 'cuprite'

spec/spec_helper.rb

@@ -13,7 +13,8 @@
 ENV['RAILS_ENV'] = 'test'
 require 'rails'
 ENV['RAILS'] = Rails.version
-ENV['RAILS_ROOT'] = File.expand_path("../rails/rails-#{ENV['RAILS']}", __FILE__)
+ENV['DB'] ||= 'sqlite'
+ENV['RAILS_ROOT'] = File.expand_path("../rails/rails-#{ENV['RAILS']}-#{ENV['DB']}", __FILE__)
 system 'rake setup' unless File.exist?(ENV['RAILS_ROOT'])
 
 require 'active_model'

spec/support/rails_template.rb

@@ -1,5 +1,41 @@
 create_file "app/assets/config/manifest.js", skip: true
 
+db = ENV['DB'] || 'sqlite'
+case db
+when 'mysql'
+  remove_file 'config/database.yml'
+  create_file 'config/database.yml', <<~YAML
+    default: &default
+      adapter: mysql2
+      encoding: utf8mb4
+      pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+      host: <%= ENV.fetch("DB_HOST", "127.0.0.1") %>
+      port: <%= ENV.fetch("DB_PORT", 3306) %>
+      username: <%= ENV.fetch("DB_USERNAME", "root") %>
+      password: <%= ENV.fetch("DB_PASSWORD", "root") %>
+
+    test:
+      <<: *default
+      database: active_admin_import_test
+  YAML
+when 'postgres', 'postgresql'
+  remove_file 'config/database.yml'
+  create_file 'config/database.yml', <<~YAML
+    default: &default
+      adapter: postgresql
+      encoding: unicode
+      pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+      host: <%= ENV.fetch("DB_HOST", "127.0.0.1") %>
+      port: <%= ENV.fetch("DB_PORT", 5432) %>
+      username: <%= ENV.fetch("DB_USERNAME", "postgres") %>
+      password: <%= ENV.fetch("DB_PASSWORD", "postgres") %>
+
+    test:
+      <<: *default
+      database: active_admin_import_test
+  YAML
+end
+
 generate :model, 'author name:string{10}:uniq last_name:string birthday:date --force'
 generate :model, 'post title:string:uniq body:text request_ip:string author:references --force'
 generate :model, 'post_comment body:text post:references --force'
@@ -19,6 +55,6 @@
 
 run 'rm -rf test'
 route "root :to => 'admin/dashboard#index'"
-rake 'db:migrate'
+rake 'db:create db:migrate'
 
 run 'rm -f Gemfile Gemfile.lock'

tasks/test.rake

@@ -2,12 +2,20 @@ desc "Creates a test rails app for the specs to run against"
 task :setup do
   require 'rails/version'
 
-  rails_new_opts = %w(
+  db = ENV['DB'] || 'sqlite'
+  rails_db = case db
+             when 'mysql' then 'mysql'
+             when 'postgres', 'postgresql' then 'postgresql'
+             else 'sqlite3'
+             end
+
+  rails_new_opts = %W(
     --skip-turbolinks
     --skip-spring
     --skip-bootsnap
+    -d #{rails_db}
     -m
     spec/support/rails_template.rb
   )
-  system "bundle exec rails new spec/rails/rails-#{Rails::VERSION::STRING} #{rails_new_opts.join(' ')}"
+  system "bundle exec rails new spec/rails/rails-#{Rails::VERSION::STRING}-#{db} #{rails_new_opts.join(' ')}"
 end