Add namespacing to mailer generator

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

actionmailer/lib/rails/generators/mailer/templates/mailer.rb

+<% module_namespacing do -%>
 class <%= class_name %> < ActionMailer::Base
   default :from => "from@example.com"
 <% for action in actions -%>
@@ -14,3 +15,4 @@ def <%= action %>
   end
 <% end -%>
 end
+<% end -%>

railties/lib/rails/generators/test_unit/mailer/templates/functional_test.rb

 require 'test_helper'
 
+<% module_namespacing do -%>
 class <%= class_name %>Test < ActionMailer::TestCase
 <% for action in actions -%>
   test "<%= action %>" do
@@ -18,3 +19,4 @@ class <%= class_name %>Test < ActionMailer::TestCase
   end
 <% end -%>
 end
+<% end -%>

railties/test/generators/namespaced_generators_test.rb

@@ -2,6 +2,7 @@
 require 'rails/generators/rails/controller/controller_generator'
 require 'rails/generators/rails/model/model_generator'
 require 'rails/generators/rails/observer/observer_generator'
+require 'rails/generators/mailer/mailer_generator'
 
 class NamespacedGeneratorTestCase < Rails::Generators::TestCase
   def setup
@@ -150,3 +151,54 @@ def test_invokes_default_test_framework
     assert_file "test/unit/test_app/account_observer_test.rb", /module TestApp/, /  class AccountObserverTest < ActiveSupport::TestCase/
   end
 end
+
+class NamespacedMailerGeneratorTest < NamespacedGeneratorTestCase
+  include GeneratorsTestHelper
+  arguments %w(notifier foo bar)
+  tests Rails::Generators::MailerGenerator
+
+  def test_mailer_skeleton_is_created
+    run_generator
+    assert_file "app/mailers/test_app/notifier.rb" do |mailer|
+      assert_match /module TestApp/, mailer
+      assert_match /class Notifier < ActionMailer::Base/, mailer
+      assert_match /default :from => "from@example.com"/, mailer
+    end
+  end
+
+  def test_mailer_with_i18n_helper
+    run_generator
+    assert_file "app/mailers/test_app/notifier.rb" do |mailer|
+      assert_match /en\.notifier\.foo\.subject/, mailer
+      assert_match /en\.notifier\.bar\.subject/, mailer
+    end
+  end
+
+  def test_invokes_default_test_framework
+    run_generator
+    assert_file "test/functional/test_app/notifier_test.rb" do |test|
+      assert_match /module TestApp/, test
+      assert_match /class NotifierTest < ActionMailer::TestCase/, test
+      assert_match /test "foo"/, test
+      assert_match /test "bar"/, test
+    end
+  end
+
+  def test_invokes_default_template_engine
+    run_generator
+    assert_file "app/views/test_app/notifier/foo.text.erb" do |view|
+      assert_match %r(app/views/test_app/notifier/foo\.text\.erb), view
+      assert_match /<%= @greeting %>/, view
+    end
+
+    assert_file "app/views/test_app/notifier/bar.text.erb" do |view|
+      assert_match %r(app/views/test_app/notifier/bar\.text\.erb), view
+      assert_match /<%= @greeting %>/, view
+    end
+  end
+
+  def test_invokes_default_template_engine_even_with_no_action
+    run_generator ["notifier"]
+    assert_file "app/views/test_app/notifier"
+  end
+end