CI test on both MySQL and SQLite

.travis.yml

@@ -6,14 +6,16 @@ rvm:
  - 2.1
  - 2.2
 
+env:
+  - DATABASE_URL=mysql2://localhost/tracks_test
+  - DATABASE_URL=sqlite3:db/test.sqlite3
+
 bundler_args: --without development --jobs=3 --retry=3
 
 before_script:
-  - "mysql -e 'create database tracks_test;'"
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"
   - "cp config/site.yml.tmpl config/site.yml"
-  - "cp config/database.yml.tmpl config/database.yml"
 
 script: "bin/rake ci"
 

lib/tasks/continuous_integration.rake

@@ -9,7 +9,7 @@ task :ci do |t|
   require 'simplecov'
   SimpleCov.start 'rails'
 
-  [:environment, 'test:all', 'cucumber'].each do |t|
+  [:environment, 'db:create', 'test:all', 'cucumber'].each do |t|
     Rake::Task[t].invoke
   end
 end