mailer_class is a class method not an instance method. [josh] Closes #10041

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8173 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionmailer/lib/action_mailer/test_case.rb

@@ -53,7 +53,7 @@ def encode(subject)
       end
 
       def read_fixture(action)
-        IO.readlines(File.join(RAILS_ROOT, 'test', 'fixtures', mailer_class.name.underscore, action))
+        IO.readlines(File.join(RAILS_ROOT, 'test', 'fixtures', self.class.mailer_class.name.underscore, action))
       end
   end
 end