move PG_VERSION since it's only used in one test case + tune jdbc config

Author: kares

test/db/jdbc_postgres.rb

@@ -4,21 +4,17 @@
 require 'jdbc/postgres' # driver not loaded for plain JDBC
 Jdbc::Postgres::load_driver
 
-url = POSTGRES_CONFIG[:host].dup
-url << ":#{POSTGRES_CONFIG[:port]}" if POSTGRES_CONFIG[:port]
+url = POSTGRES_CONFIG[:url] || begin
+  url_part = POSTGRES_CONFIG[:host].dup
+  url_part << ":#{POSTGRES_CONFIG[:port]}" if POSTGRES_CONFIG[:port]
+  "jdbc:postgresql://#{url_part}/#{POSTGRES_CONFIG[:database]}"
+end
 
 ActiveRecord::Base.establish_connection({
-  :adapter => 'jdbc',
-  :driver => 'org.postgresql.Driver',
-  :url => "jdbc:postgresql://#{url}/#{POSTGRES_CONFIG[:database]}",
+  :adapter => 'jdbc', :url => url, :driver => 'org.postgresql.Driver',
   :username => POSTGRES_CONFIG[:username],
   :password => POSTGRES_CONFIG[:password],
   :prepared_statements => ENV['PREPARED_STATEMENTS'] || ENV['PS']
 })
 
-begin
-  result = ActiveRecord::Base.connection.execute("SHOW server_version_num")
-  PG_VERSION = result.first.first[1].to_i
-rescue
-  PG_VERSION = 0
-end
+$LOADED_FEATURES << 'db/postgres.rb' # we're running tests that require this

test/db/postgres.rb

@@ -2,10 +2,3 @@
 require 'db/postgres_config'
 
 ActiveRecord::Base.establish_connection(POSTGRES_CONFIG)
-
-begin
-  result = ActiveRecord::Base.connection.execute("SHOW server_version_num")
-  PG_VERSION = result.first.first[1].to_i
-rescue
-  PG_VERSION = 0
-end

test/db/postgresql/native_types_test.rb

@@ -1,6 +1,13 @@
 require 'db/postgres'
 
-class PostgresNativeTypesTest < Test::Unit::TestCase
+class PostgreSQLNativeTypesTest < Test::Unit::TestCase
+
+  begin
+    result = ActiveRecord::Base.connection.execute("SHOW server_version_num")
+    PG_VERSION = result.first.values[0].to_i
+  rescue
+    PG_VERSION = 0
+  end
 
   class CustomersMigration < ActiveRecord::Migration
     def self.up