And also on MySQL

gemfiles/active_record_41.gemfile

@@ -11,10 +11,12 @@ platforms :ruby do
     gem 'nokogiri', '~> 1.6.8'
   end
   gem 'pg'
+  gem 'mysql2'
 end
 platforms :jruby do
   gem 'activerecord-jdbcsqlite3-adapter', '>= 1.3.0'
   gem 'activerecord-jdbcpostgresql-adapter'
+  gem 'activerecord-jdbcmysql-adapter'
 end
 platforms :rbx do
   gem 'rubysl', '~> 2.0'

gemfiles/active_record_42.gemfile

@@ -11,10 +11,12 @@ platforms :ruby do
     gem 'nokogiri', '~> 1.6.8'
   end
   gem 'pg'
+  gem 'mysql2'
 end
 platforms :jruby do
   gem 'activerecord-jdbcsqlite3-adapter', '>= 1.3.0'
   gem 'activerecord-jdbcpostgresql-adapter'
+  gem 'activerecord-jdbcmysql-adapter'
 end
 platforms :rbx do
   gem 'rubysl', '~> 2.0'

gemfiles/active_record_50.gemfile

@@ -7,10 +7,12 @@ gem 'actionview', '~> 5.0.0', require: 'action_view'
 platforms :ruby do
   gem 'sqlite3'
   gem 'pg'
+  gem 'mysql2'
 end
 platforms :jruby do
   gem 'activerecord-jdbcsqlite3-adapter', '>= 1.3.0'
   gem 'activerecord-jdbcpostgresql-adapter'
+  gem 'activerecord-jdbcmysql-adapter'
 end
 platforms :rbx do
   gem 'rubysl', '~> 2.0'

gemfiles/active_record_51.gemfile

@@ -7,10 +7,12 @@ gem 'actionview', '~> 5.1.0', require: 'action_view'
 platforms :ruby do
   gem 'sqlite3'
   gem 'pg'
+  gem 'mysql2'
 end
 platforms :jruby do
   gem 'activerecord-jdbcsqlite3-adapter', '>= 1.3.0'
   gem 'activerecord-jdbcpostgresql-adapter'
+  gem 'activerecord-jdbcmysql-adapter'
 end
 platforms :rbx do
   gem 'rubysl', '~> 2.0'

kaminari-core/test/fake_app/config/database.yml

@@ -11,5 +11,12 @@ postgresql: &postgresql
   password:
   database: kaminari_test
 
+mysql: &mysql
+  adapter: mysql2
+  host: localhost
+  username: root
+  password:
+  database: kaminari_test
+
 test:
   <<: *<%= ENV['DB'] %>