🎨 Modernize test harness

Author: pboling

.gitignore

@@ -4,6 +4,7 @@
 .config
 .yardoc
 Gemfile.lock
+gemfiles/*.lock
 InstalledFiles
 _yardoc
 coverage

Gemfile

@@ -1,4 +1,13 @@
 # frozen_string_literal: true
 
 source 'https://rubygems.org'
+
 gemspec
+
+# For default test setup with postgresql
+# NOTE: If you want to run tests against MySQL do:
+#   docker compose --file docker-compose.mysql.yml up -d
+#   BUNDLE_GEMFILE=gemfiles/mysql.gemfile bundle install
+#   BUNDLE_GEMFILE=gemfiles/mysql.gemfile DB_ADAPTER=mysql bundle exec rake spec
+#   docker compose down
+gem 'pg'

README.md

@@ -170,9 +170,20 @@ The tests require a database. We've provided a simple `docker-compose.yml` that
 it trivial to run the tests against PostgreSQL. Simply run `docker compose up -d`
 followed by `rake spec`. When you're done, run `docker compose down` to stop the database.
 
-In order to use another database, simply define the `DATABASE_URL` environment variable
+In order to use another PostgreSQL database, simply define the `DATABASE_URL` environment variable
 appropriately.
 
+### Test against MySQL
+
+If you want to run tests against MySQL do:
+
+```shell
+docker compose --file docker-compose.mysql.yml up -d
+BUNDLE_GEMFILE=gemfiles/mysql.gemfile bundle install
+BUNDLE_GEMFILE=gemfiles/mysql.gemfile DB_ADAPTER=mysql bundle exec rake spec
+docker compose down
+```
+
 ## License
 
 `ActiveRecord::JSONValidator` is © 2013-2022 [Mirego](https://www.mirego.com) and may be freely distributed under the [New BSD license](https://opensource.org/licenses/BSD-3-Clause). See the [`LICENSE.md`](https://github.com/mirego/activerecord_json_validator/blob/master/LICENSE.md) file.

docker-compose.mysql.yml

@@ -0,0 +1,10 @@
+version: '3.2'
+
+services:
+  mysql:
+    image: mysql:8.1
+    ports:
+      - 3306:3306
+    environment:
+      - MYSQL_ALLOW_EMPTY_PASSWORD=true
+      - MYSQL_DATABASE=activerecord_json_validator_test

gemfiles/mysql.gemfile

@@ -0,0 +1,5 @@
+source 'https://rubygems.org'
+
+gemspec path: '../'
+
+gem 'mysql2', "~> 0.5.5"

gemfiles/postgresql.gemfile

@@ -0,0 +1,5 @@
+source 'https://rubygems.org'
+
+gemspec path: '../'
+
+gem 'pg'

spec/spec_helper.rb

@@ -4,7 +4,17 @@
 
 require 'active_support/all'
 require 'rspec'
-require 'pg'
+require 'support/database/database_adapter'
+
+adapter = case ENV['DB_ADAPTER']
+            when 'mysql'
+              require 'support/database/mysql_adapter'
+              'mysql'
+            else
+              require 'pg'
+              require 'support/database/postgresql_adapter'
+              'postgresql'
+          end
 
 require 'activerecord_json_validator'
 
@@ -17,7 +27,6 @@
   config.include ModelMacros
 
   config.before :each do
-    adapter = ENV['DB_ADAPTER'] || 'postgresql'
     setup_database(adapter: adapter, database: 'activerecord_json_validator_test')
   end
 end

spec/support/database/database_adapter.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+require 'active_record'
+class DatabaseAdapter
+  def initialize(opts = {})
+    @database = opts[:database]
+  end
+
+  def reset_database!
+    raise 'Define reset_database! in subclasses!'
+  end
+
+  def establish_connection!
+    raise 'Define establish_connection! in subclasses!'
+  end
+end

spec/support/database/mysql_adapter.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require_relative 'database_adapter'
+
+class MysqlAdapter < DatabaseAdapter
+  def reset_database!(database)
+    ActiveRecord::Base.connection.execute("SELECT concat('DROP TABLE IF EXISTS ', table_name, ';') FROM information_schema.tables WHERE table_schema = '#{database}';")
+  end
+
+  def establish_connection!
+    ActiveRecord::Base.establish_connection(
+      ENV.fetch(
+        'DATABASE_URL',
+        'mysql2://root:@127.0.0.1:3306/activerecord_json_validator_test?pool=5'
+      )
+    )
+  end
+end

spec/support/macros/database/postgresql_adapter.rb renamed to spec/support/database/postgresql_adapter.rb

@@ -1,10 +1,20 @@
 # frozen_string_literal: true
 
+require 'pg'
 require_relative 'database_adapter'
 
 class PostgresqlAdapter < DatabaseAdapter
-  def reset_database!
+  def reset_database!(_)
     ActiveRecord::Base.connection.execute('drop schema public cascade;')
     ActiveRecord::Base.connection.execute('create schema public;')
   end
+
+  def establish_connection!
+    ActiveRecord::Base.establish_connection(
+      ENV.fetch(
+        'DATABASE_URL',
+        'postgres://postgres@localhost/activerecord_json_validator_test'
+      )
+    )
+  end
 end