Attend to brittle mailer generator tests

railties/test/generators/mailer_generator_test.rb

@@ -9,7 +9,7 @@ def test_mailer_skeleton_is_created
     run_generator
     assert_file "app/mailers/notifier.rb" do |mailer|
       assert_match /class Notifier < ActionMailer::Base/, mailer
-      assert_match /self\.defaults :from => "from@example.com"/, mailer
+      assert_match /defaults :from => "from@example.com"/, mailer
     end
   end
 
@@ -61,12 +61,12 @@ def test_actions_are_turned_into_methods
 
     assert_file "app/mailers/notifier.rb" do |mailer|
       assert_instance_method :foo, mailer do |foo|
-        assert_match /mail\(:to => "to@example.org"\)/, foo
+        assert_match /mail :to => "to@example.org"/, foo
         assert_match /@greeting = "Hi"/, foo
       end
 
       assert_instance_method :bar, mailer do |bar|
-        assert_match /mail\(:to => "to@example.org"\)/, bar
+        assert_match /mail :to => "to@example.org"/, bar
         assert_match /@greeting = "Hi"/, bar
       end
     end