added dependencies in Gemfile for running ActiveRecord tests with Oracle database

Gemfile

@@ -49,3 +49,15 @@ platforms :jruby do
     gem "activerecord-jdbcpostgresql-adapter"
   end
 end
+
+# gems that are necessary for ActiveRecord tests with Oracle database
+if ENV['ORACLE_ENHANCED_PATH'] || ENV['ORACLE_ENHANCED']
+  platforms :ruby do
+    gem 'ruby-oci8', ">= 2.0.4"
+  end
+  if ENV['ORACLE_ENHANCED_PATH']
+    gem 'activerecord-oracle_enhanced-adapter', :path => ENV['ORACLE_ENHANCED_PATH']
+  else
+    gem "activerecord-oracle_enhanced-adapter", :git => "git://github.com/rsim/oracle-enhanced.git"
+  end
+end

activerecord/test/connections/native_oracle/connection.rb

-# gem "rsim-activerecord-oracle_enhanced-adapter"
-# gem "activerecord-oracle_enhanced-adapter", ">=1.2.1"
-# uses local copy of oracle_enhanced adapter
-$:.unshift("../../oracle-enhanced/lib")
+# uses oracle_enhanced adapter in ENV['ORACLE_ENHANCED_PATH'] or from github.com/rsim/oracle-enhanced.git
 require 'active_record/connection_adapters/oracle_enhanced_adapter'
-# gem "activerecord-jdbc-adapter"
-# require 'active_record/connection_adapters/jdbc_adapter'
 
 # otherwise failed with silence_warnings method missing exception
 require 'active_support/core_ext/kernel/reporting'