Seperate unit and integration tests.

This makes it easier to re-use the integration tests in a seperate gem that
optimizes parts of liquid with a native implementation.

test/unit/template_unit_test.rb

@@ -0,0 +1,19 @@
+require 'test_helper'
+
+class TemplateUnitTest < Test::Unit::TestCase
+  include Liquid
+
+  def test_sets_default_localization_in_document
+    t = Template.new
+    t.parse('')
+    assert_instance_of I18n, t.root.options[:locale]
+  end
+
+  def test_sets_default_localization_in_context_with_quick_initialization
+    t = Template.new
+    t.parse('{{foo}}', :locale => I18n.new(fixture("en_locale.yml")))
+
+    assert_instance_of I18n, t.root.options[:locale]
+    assert_equal fixture("en_locale.yml"), t.root.options[:locale].path
+  end
+end