I saw many deprecation warnings in http://travis-ci.org/#!/rails/rails/jobs/2262213 and in my box.
I think it's related to 582a7f4 .
Fixes warnings when executing rake test in ActionMailer. Related to 5…
sorry, I notice that the above code is test breaker in AM isolated test only. I'm investigating.
I guess the problem mentioned above comment is fixed by #7477.