Depend on mysql2 gem for database testing operations instead of sqlite

SQLite was having incompatibility issues with Ruby 1.9.3.  This makes
for a higher barrier to entry when testing carrier wave locally but
ensure that tests can pass on TravisCI.

.travis.yml

@@ -20,3 +20,6 @@ matrix:
       gemfile: gemfiles/rails_master.gemfile
     - rvm: rbx-18mode
       gemfile: gemfiles/rails_master.gemfile
+
+before_script:
+  - "mysql -e 'create database carrierwave_test;'"

carrierwave.gemspec

@@ -24,13 +24,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency "activesupport", ">= 3.2.0.rc2"
 
-  if defined?(JRUBY_VERSION)
-    s.add_development_dependency "activerecord-jdbc-adapter"
-    s.add_development_dependency "jdbc-sqlite3"
-  else
-    s.add_development_dependency "sqlite3"
-  end
-
+  s.add_development_dependency "mysql2"
   s.add_development_dependency "rails", ">= 3.2.0.rc2"
   s.add_development_dependency "cucumber", "1.1.4"
   s.add_development_dependency "json"

features/support/activerecord.rb

@@ -1,19 +1,17 @@
 # encoding: utf-8
 
-unless defined?(JRUBY_VERSION)
-  # not sure why we need to do this
-  require 'sqlite3/sqlite3_native'
-  require 'sqlite3'
-end
+require 'mysql2'
 
 require 'active_record'
 require 'carrierwave/mount'
 require 'carrierwave/orm/activerecord'
 
-# change this if sqlite is unavailable
+# Change this if MySQL is unavailable
 dbconfig = {
-  :adapter => 'sqlite3',
-  :database => ':memory:'
+  :adapter  => 'mysql2',
+  :database => 'carrierwave_test',
+  :username => 'root',
+  :encoding => 'utf8'
 }
 
 ActiveRecord::Base.establish_connection(dbconfig)

spec/orm/activerecord_spec.rb

@@ -4,10 +4,12 @@
 
 require 'carrierwave/orm/activerecord'
 
-# change this if sqlite is unavailable
+# Change this if MySQL is unavailable
 dbconfig = {
-  :adapter => 'sqlite3',
-  :database => ':memory:'
+  :adapter  => 'mysql2',
+  :database => 'carrierwave_test',
+  :username => 'root',
+  :encoding => 'utf8'
 }
 
 ActiveRecord::Base.establish_connection(dbconfig)

spec/spec_helper.rb

@@ -12,11 +12,7 @@
 require 'open-uri'
 require 'sham_rack'
 
-unless defined?(JRUBY_VERSION)
-  # not sure why we need to do this
-  require 'sqlite3/sqlite3_native'
-  require 'sqlite3'
-end
+require 'mysql2'
 
 require 'fog'
 require 'storage/fog_helper'