Adding Full Support to Test Against Multiple DB engines.

Accomplished by swapping out database.yml files for the dummy rails instance with en engine specific one.

.gitignore

@@ -1,6 +1,7 @@
 NOTES
 test/debug.log
 test/paper_trail_plugin.sqlite3.db
+test/dummy/config/database.yml
 test/dummy/db/*.sqlite3
 test/dummy/log/*
 test/dummy/tmp/*

.travis.yml

@@ -5,8 +5,21 @@ rvm:
   - 1.8.7
   - jruby-19mode
   - jruby-18mode
+env:
+  - DB=mysql
+  - DB=postgres
+  - DB=sqlite
 
-before_install: gem update --system 2.2.1
+before_install: 
+  - gem update --system 2.2.1
+
+before_script:
+  - sh -c "if [ \"$DB\" = 'mysql' ]; then mysql   -e 'create database paper_trail_test;'; fi"
+  - sh -c "if [ \"$DB\" = 'mysql' ]; then mysql   -e 'create database paper_trail_bar; '; fi"
+  - sh -c "if [ \"$DB\" = 'mysql' ]; then mysql   -e 'create database paper_trail_foo; '; fi"
+  - sh -c "if [ \"$DB\" = 'postgres' ]; then psql -c 'create database paper_trail_test;' -U postgres; fi"
+  - sh -c "if [ \"$DB\" = 'postgres' ]; then psql -c 'create database paper_trail_bar;'  -U postgres; fi"
+  - sh -c "if [ \"$DB\" = 'postgres' ]; then psql -c 'create database paper_trail_foo;'  -U postgres; fi"
 
 gemfile:
   - Gemfile
@@ -19,3 +32,5 @@ matrix:
       gemfile: Gemfile
     - rvm: 1.8.7
       gemfile: Gemfile
+    - env: DB=mysql
+    

Rakefile

@@ -2,6 +2,19 @@ require 'bundler'
 Bundler::GemHelper.install_tasks
 
 require 'rake/testtask'
+
+desc 'Set a relevant database.yml'
+task :prepare do
+  ENV["DB"] ||= "sqlite"
+  if RUBY_VERSION.to_f >= 1.9
+    FileUtils.cp "test/dummy/config/database.#{ENV["DB"]}.yml", "test/dummy/config/database.yml"
+  else
+    require 'ftools'
+    File.cp "test/dummy/config/database.#{ENV["DB"]}.yml", "test/dummy/config/database.yml"
+  end
+end
+
+
 desc 'Run tests on PaperTrail with Test::Unit.'
 Rake::TestTask.new(:test) do |t|
   t.libs << 'lib'
@@ -15,4 +28,4 @@ desc 'Run PaperTrail specs for the RSpec helper.'
 RSpec::Core::RakeTask.new(:spec)
 
 desc 'Default: run all available test suites'
-task :default => [:test, :spec]
+task :default => [:prepare, :test, :spec]

gemfiles/3.0.gemfile

@@ -14,19 +14,26 @@ group :development, :test do
   gem 'sinatra', '~> 1.0'
   gem 'rack-test', '>= 0.6'
 
-  # Use sqlite3 gem for regular Ruby
-  gem 'sqlite3', '~> 1.2', :platform => :ruby
-
   # RSpec testing
   gem 'rspec-rails', '~> 2.14'
   gem 'generator_spec'
 
+  platforms :ruby do 
+    gem 'sqlite3', '~> 1.2'
+    gem 'mysql2', '~> 0.3'
+    gem 'pg', '~> 0.17'
+  end
+
   platforms :jruby, :ruby_18 do
     # shoulda-matchers > 2.0 is not compatible with Ruby18.
     # Since we can't specify difference between JRuby 18/19, we need to use shoulda-matchers 1.5 for all JRuby testing.
     gem 'shoulda-matchers', '~> 1.5'
   end
 
-  # Use jRuby's sqlite3 adapter for jRuby
-  gem 'activerecord-jdbcsqlite3-adapter', '~> 1.2.9', :platform => :jruby
+  platforms :jruby do 
+    # Use jRuby's sqlite3 adapter for jRuby
+    gem 'activerecord-jdbcsqlite3-adapter', '~> 1.3'
+    gem 'activerecord-jdbcpostgresql-adapter', '~> 1.3'
+    gem 'activerecord-jdbcmysql-adapter', '~> 1.3'
+  end
 end

paper_trail.gemspec

@@ -35,7 +35,11 @@ Gem::Specification.new do |s|
   # JRuby support for the test ENV
   unless defined?(JRUBY_VERSION)
     s.add_development_dependency 'sqlite3', '~> 1.2'
+    s.add_development_dependency 'mysql2', '~> 0.3'
+    s.add_development_dependency 'pg', '~> 0.17'
   else
     s.add_development_dependency 'activerecord-jdbcsqlite3-adapter', '~> 1.3'
+    s.add_development_dependency 'activerecord-jdbcpostgresql-adapter', '~> 1.3'
+    s.add_development_dependency 'activerecord-jdbcmysql-adapter', '~> 1.3'
   end
 end

spec/support/alt_db_init.rb

@@ -2,15 +2,21 @@
 # then defines those namespaces, then establishes the sqlite3 connection for the namespaces
 # to simulate an application with multiple database connections.
 
+#Load database yaml to use
+configs = YAML.load_file("#{Rails.root}/config/database.yml")
+
+#If we are testing with sqlite make it quick
 db_directory = "#{Rails.root}/db"
 # setup alternate databases
-if RUBY_VERSION.to_f >= 1.9
-  FileUtils.cp "#{db_directory}/test.sqlite3", "#{db_directory}/test-foo.sqlite3"
-  FileUtils.cp "#{db_directory}/test.sqlite3", "#{db_directory}/test-bar.sqlite3"
-else
-  require 'ftools'
-  File.cp "#{db_directory}/test.sqlite3", "#{db_directory}/test-foo.sqlite3"
-  File.cp "#{db_directory}/test.sqlite3", "#{db_directory}/test-bar.sqlite3"
+if ENV["DB"] == "sqlite"
+  if  RUBY_VERSION.to_f >= 1.9
+    FileUtils.cp "#{db_directory}/test.sqlite3", "#{db_directory}/test-foo.sqlite3"
+    FileUtils.cp "#{db_directory}/test.sqlite3", "#{db_directory}/test-bar.sqlite3"
+  else
+    require 'ftools'
+    File.cp "#{db_directory}/test.sqlite3", "#{db_directory}/test-foo.sqlite3"
+    File.cp "#{db_directory}/test.sqlite3", "#{db_directory}/test-bar.sqlite3"
+  end
 end
 
 module Foo
@@ -26,7 +32,11 @@ module Foo
     has_paper_trail :class_name => 'Foo::Version'
   end
 end
-Foo::Base.establish_connection(:adapter => 'sqlite3', :database => "#{db_directory}/test-foo.sqlite3")
+
+Foo::Base.configurations = configs
+Foo::Base.establish_connection(:foo)
+ActiveRecord::Base.establish_connection(:foo)
+ActiveRecord::Migrator.migrate File.expand_path("#{db_directory}/migrate/", __FILE__)
 
 module Bar
   class Base < ActiveRecord::Base
@@ -41,4 +51,9 @@ module Bar
     has_paper_trail :class_name => 'Bar::Version'
   end
 end
-Bar::Base.establish_connection(:adapter => 'sqlite3', :database => "#{db_directory}/test-bar.sqlite3")
+
+Bar::Base.configurations = configs
+Bar::Base.establish_connection(:bar)
+ActiveRecord::Base.establish_connection(:bar)
+
+ActiveRecord::Migrator.migrate File.expand_path("#{db_directory}/migrate/", __FILE__)

test/dummy/config/database.mysql.yml

@@ -0,0 +1,19 @@
+test: &test
+  adapter: mysql2
+  encoding: utf8
+  database: paper_trail_test
+  pool: 5
+  username: root
+  password:
+  host: localhost
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+foo:
+  <<: *test
+  database: paper_trail_foo
+
+bar:
+  <<: *test
+  database: paper_trail_bar

test/dummy/config/database.postgres.yml

@@ -0,0 +1,15 @@
+test: &test
+  adapter: postgresql
+  database: paper_trail_test
+  username: postgres
+  password: 
+  host:     localhost
+  port:     5432
+
+foo:
+  <<: *test
+  database: paper_trail_foo
+
+bar:
+  <<: *test
+  database: paper_trail_bar

test/dummy/config/database.sqlite.yml

@@ -0,0 +1,15 @@
+# SQLite version 3.x
+#   gem install sqlite3-ruby (not necessary on OS X Leopard)
+test: &test
+  adapter: sqlite3
+  pool: 5
+  timeout: 5000
+  database: db/test.sqlite3
+
+foo:
+  <<: *test
+  database: db/test-foo.sqlite3
+
+bar:
+  <<: *test
+  database: db/test-bar.sqlite3

test/dummy/config/database.yml

@@ -1,22 +0,0 @@
-# SQLite version 3.x
-#   gem install sqlite3-ruby (not necessary on OS X Leopard)
-development:
-  adapter: sqlite3
-  database: db/development.sqlite3
-  pool: 5
-  timeout: 5000
-
-# Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
-# Do not set this db to the same as development or production.
-test:
-  adapter: sqlite3
-  database: db/test.sqlite3
-  pool: 5
-  timeout: 5000
-
-production:
-  adapter: sqlite3
-  database: db/production.sqlite3
-  pool: 5
-  timeout: 5000

test/functional/modular_sinatra_test.rb

@@ -3,7 +3,9 @@ require 'sinatra/base'
 
 # --- Tests for modular `Sinatra::Base` style ----
 class BaseApp < Sinatra::Base
-  ActiveRecord::Base.establish_connection(:adapter => 'sqlite3', :database => File.expand_path('../../dummy/db/test.sqlite3', __FILE__))
+  configs = YAML.load_file(File.expand_path('../../dummy/config/database.yml', __FILE__))
+  ActiveRecord::Base.configurations = configs
+  ActiveRecord::Base.establish_connection(:test)
   register PaperTrail::Sinatra
 
   get '/test' do

test/functional/sinatra_test.rb

@@ -3,7 +3,9 @@ require 'test_helper'
 
 # --- Tests for non-modular `Sinatra::Application` style ----
 class Sinatra::Application
-  ActiveRecord::Base.establish_connection(:adapter => 'sqlite3', :database => File.expand_path('../../dummy/db/test.sqlite3', __FILE__))
+  configs = YAML.load_file(File.expand_path('../../dummy/config/database.yml', __FILE__))
+  ActiveRecord::Base.configurations = configs
+  ActiveRecord::Base.establish_connection(:test)
   register PaperTrail::Sinatra # we shouldn't actually need this line if I'm not mistaken but the tests seem to fail without it ATM
 
   get '/test' do

test/test_helper.rb

@@ -1,6 +1,6 @@
 # Configure Rails Envinronment
 ENV["RAILS_ENV"] = "test"
-
+ENV["DB"] ||= "sqlite"
 require File.expand_path("../dummy/config/environment.rb",  __FILE__)
 require "rails/test_help"
 require 'shoulda'